Garmin Gpsmap 392 398 492 498 Users Manual 392/398/492/498 Owner's

492-M-Gpsmap-392-Manual-Owner-S-Manual 492-m-gpsmap-392-manual-owner-s-manual

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Owner’s Manual

GPSMAP 392/398
GPSMAP 492/498

GPSMAP 498 shown

© Copyright 2006 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151st Street,
Olathe, Kansas 66062, USA
Tel. 913/397.8200 or 800/800.1020
Fax 913/397.8282

Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate,
Romsey, SO51 9DL, UK
Tel. +44 (0) 870.8501241 (outside the UK)
0808 2380000 (UK only)
Fax 44/0870.8501251

Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County,
Taiwan
Tel. 886/2.2642.9199
Fax 886/2.2642.9099

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any
storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual
onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic
or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this
manual or any revision hereto is strictly prohibited.
Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content
without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and
supplemental information concerning the use and operation of this and other Garmin products.
Garmin®, GPSMAP®, AutoLocate® , UltraScroll®, TracBack®, BlueChart®, MapSource®, and BlueChart® g2TM are registered trademarks of Garmin Ltd. or its
subsidiaries and may not be used without the express permission of Garmin.

September 2006

Part Number 190-00653-00 Rev. C

Printed in Taiwan

INTRODUCTION > ABOUT THIS MANUAL

INTRODUCTION

The Basic Operation section provides you with detailed
information and step-by-step directions for features such as using
the Find Menu, navigating a route, and using waypoints.

Thank you for choosing the Garmin® GPSMAP® 392/398/492/498.
The GPSMAP 392/398/492/498 utilizes the proven performance of
Garmin GPS and full-featured mapping to create an unsurpassed
portable GPS receiver. Take a moment now to compare the contents
of this package with the packing list on the outside of the box. If
any pieces are missing, contact your Garmin dealer immediately.

The Main Pages section provides detailed explanations about each
page in the GPSMAP 392/398/492/498 and step-by-step directions
on using the pages.

Before you begin working with the GPSMAP 392/398/492/498,
review the installation instructions listed in the Appendix. If
you have any question about installing your chartplotter, contact
Garmin Product Support or a professional installer.

The Using Sonar section provides detailed explanations about the
Sonar and Flasher Pages and how to conﬁgure your sonar options.

The GPSMAP 392/398/492/498 Sounder is CANet compatible. See
the CANet accessory installation instructions for more information.

About This Manual

To get the most out of your new navigation system, take time to
read this manual and learn the operating procedures for your unit in
detail. This manual is organized into the following sections.
The Introduction section contains the Table of Contents as well as
GPSMAP 392/398/492/498 care information.

GPSMAP 392/398/492/498 Owner’s Manual

The Main Menu section provides detailed explanations about the
Main Menu and how to use it to conﬁgure your unit.

The Appendix contains installation instructions, speciﬁcations,
optional accessories, and maintenance information. You can also
ﬁnd warranty and FCC information in the Appendix.
An Index is provided at the end of the manual for reference.

Manual Conventions

This manual uses the term Warning to indicate a potentially
hazardous situation, which, if not avoided, could result in death or
serious injury.
This manual uses the term Caution to indicate a potentially
hazardous situation, which, if not avoided, may result in minor
injury or property damage.
i

INTRODUCTION > TABLE OF CONTENTS

Table of Contents

Introduction...........................................................................i
About This Manual ................................................................... i
Manual Conventions ................................................................ i
Warning ................................................................................... iv
Caution ..................................................................................... v
Care Information..................................................................... vi

Basic Operation ...................................................................1

Initializing the Receiver .......................................................... 1
Simulator Mode ....................................................................... 3
Adjusting the Backlight .......................................................... 4
Interface Keys .......................................................................... 5
Entering Data and Selecting Options .................................... 6
Using the Map Pointer ............................................................ 7
Creating and Using Waypoints .............................................. 8
Man OverBoard (MOB) .......................................................... 10
Reviewing and Editing Waypoints ....................................... 11
Navigating to a Destination .................................................. 12
Creating and Using Routes .................................................. 17
Find ........................................................................................ 19
Additional Information .......................................................... 21
DSC (Digital Selective Calling) ............................................. 21
AIS .......................................................................................... 25

Main Pages .........................................................................26

Map Page................................................................................ 27
Compass Page....................................................................... 32
3D Highway Page .................................................................. 33
Active Route Page ................................................................. 36

Main Menu ..........................................................................37

GPS Tab .................................................................................. 37
Tide Tab .................................................................................. 40
Trip Tab ................................................................................... 44
Celes (Celestial) Tab ............................................................. 45
Points Tab .............................................................................. 46
Route Tab ............................................................................... 51
Track Tab ................................................................................ 57
DSC Tab .................................................................................. 59
Card Tab ................................................................................. 59
Msgs Tab ................................................................................ 60
Pages Tab ............................................................................... 61
Map Tab .................................................................................. 61
Hiway (Highway) Tab ............................................................. 64
Temp (Temperature) Tab ....................................................... 64
Sonar Tab ............................................................................... 64
Systm (System) Tab ............................................................. 65
Alarm Tab ............................................................................... 70

GPSMAP 392/398/492/498 Owner’s Manual

INTRODUCTION > TABLE OF CONTENTS

Using Sonar .......................................................................72

Understanding Sonar ............................................................ 72
Sonar Tab Options ................................................................ 79
Flasher Page .......................................................................... 84
Map Split Page ....................................................................... 85

Appendix ............................................................................86

Speciﬁcations ........................................................................ 86
Installing the GPSMAP 492/498 External GPS Antenna..... 87
Mounting the GPSMAP 392/398/492/498 ............................. 88
Installing the Transducer ...................................................... 90
Connecting the Power/Data Cable ....................................... 92
Interfacing .............................................................................. 93
Installing and Removing Data Cards ................................... 94
Satellite Information .............................................................. 95

GPSMAP 392/398/492/498 Owner’s Manual

What is WAAS/EGNOS?........................................................ 96
What is a Maritime Mobile Service Identity (MMSI)? .......... 97
How ARE MMSI assignments obtained? ............................. 97
Navigation Terms .................................................................. 98
Messages and Alarms ......................................................... 100
LORAN TD System .............................................................. 103
Optional Accessories .......................................................... 105
Software License Agreement ............................................. 106
Product Registration ........................................................... 106
Limited Warranty ................................................................. 107
FCC Compliance.................................................................. 108
Declaration of Conformity (DoC) ....................................... 108

Index .................................................................................109

iii

INTRODUCTION > WARNINGS

Warning
Failure to avoid the following potentially hazardous situations could
result in an accident or collision resulting in death or serious injury.
When navigating, carefully compare information displayed on the
GPSMAP 392/398/492/498 to all available navigation sources, including
information from visual sightings, and maps. For safety, always resolve any
discrepancies or questions before continuing navigation.

Use the electronic chart in the GPSMAP 392/398/492/498 only to
facilitate, not to replace, the use of authorized government charts. Ofﬁcial
government charts and notices to mariners contain all information needed
to navigate safely.

WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive
harm. This Notice is being provided in accordance with California’s Proposition 65. If you have any questions or would like additional information, please refer
to our Web site at http://www.garmin.com/prop65.

GPSMAP 392/398/492/498 Owner’s Manual

INTRODUCTION > CAUTIONS

Caution
Failure to avoid the following potentially hazardous situations may
result in injury or property damage.
Use the GPSMAP 392/398/492/498 only as a navigational aid. Do not
attempt to use the GPSMAP 392/398/492/498 for any purpose requiring
precise measurement of direction, distance, location, or topography.
The Global Positioning System (GPS) is operated by the United States

government, which is solely responsible for its accuracy and maintenance.
The government’s system is subject to changes which could affect the
accuracy and performance of all GPS equipment, including the GPSMAP
392/398/492/498. Although the GPSMAP 392/398/492/498 is a precision
navigation device, any navigation device can be misused or misinterpreted
and, therefore, become unsafe.

Map Data Information: One of the goals of Garmin is to provide customers with the most complete and accurate cartography that is available to us at a
reasonable cost. We use a combination of governmental and private data sources, which we identify in product literature and copyright messages displayed to the
consumer. Virtually all data sources contain inaccurate or incomplete data to some extent. In some countries, complete and accurate map information is either not
available or is prohibitively expensive.

Hg - LAMP(S) INSIDE THIS PRODUCT MAY CONTAIN MERCURY AND MUST BE RECYCLED OR DISPOSED OF ACCORDING TO
LOCAL, STATE, OR FEDERAL LAWS.
The California Electronic Waste Recycling Act of 2003 requires the recycling of certain electronics. For more information on the applicability to this product,
see www.erecycle.org.

GPSMAP 392/398/492/498 Owner’s Manual

INTRODUCTION > CARE INFORMATION

Care Information
Cleaning the Unit

The GPSMAP 392/398/492/498 is constructed of high quality
materials and does not require user maintenance other than
cleaning. Clean the unit using a cloth dampened with a mild
detergent solution and then wipe dry. Avoid chemical cleaners and
solvents that can damage plastic components.

Storing the GPSMAP 392/398/492/498

Immersing the Unit in Water

The GPSMAP 392/398/492/498 is waterproof to IEC Standard
60529 IPX7. It can withstand immersion in 1 meter of water for 30
minutes. Prolonged submersion can cause damage to the unit. After
submersion, be certain to wipe and air dry the unit before reuse.
To resolve problems that cannot be remedied using this manual,
contact Garmin Product Support in the U.S. at 800/800-1020 or
Garmin Europe at 44/0870-8501241.

Do not store the GPSMAP 392/398/492/498 where prolonged
exposure to temperature extremes can occur (such as in the trunk
of a car) as permanent damage can result. User information, such
as waypoints and routes are retained in the unit’s memory without
the need for external power. It is always a good practice to back up
important user data by manually recording it or downloading it to a
PC (transferring it to MapSource.)

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > INITIALIZING THE RECEIVER

BASIC OPERATION
Initializing the Receiver

3. Press ENTER to answer NO to the window asking “Do you
want to start the Retail Demonstration?”. You are only asked
this the ﬁrst time you start the unit.

The ﬁrst time you turn on the GPSMAP 392/398/492/498, the
receiver must be given an opportunity to collect satellite data
and establish its present location. To ensure proper initialization,
the GPSMAP 392/398/492/498 is shipped from the factory in
AutoLocate Mode.
Before you initialize, make sure the GPSMAP 392/398/492/498
unit and antenna are correctly installed on your vessel according to
the instructions in the “Appendix.” Install the antenna in a location
with a clear and unobstructed view of the sky.
A full-screen GPS Information Page is shown after you press
ENTER to acknowledge the Warning Page. The page goes away
after the unit gets a position ﬁx, or you press either ENTER or
QUIT.
To turn on the GPSMAP 392/398/492/498:

The GPS Information Page appears as the receiver begins acquiring
satellites.
To turn off the GPSMAP 392/398/492/498:

1. Press and hold the POWER key.
2. When the screen is blank, release the POWER key.

1. Press and hold the POWER key until the power tone
sounds, then release the POWER key. The title page, and
then the Warning Page appears while the unit conducts a
self-test.
2. When the self-test is complete, press ENTER to agree and
acknowledge the warning.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > INITIALIZING THE RECEIVER

To graphically initialize the GPSMAP 392/398/492/498:

1. Press and hold ADJ/MENU for the Main Menu. Press up or
down on the ROCKER until the GPS tab is highlighted, and
then press ADJ/MENU once.
2. Using the ROCKER, highlight Initialize Position, and press
ENTER. The Initialize Position Page appears, prompting
you to select your approximate location with the map
pointer.

3. Use the ROCKER to move the map pointer to your
approximate location within 200 miles. If you have difﬁculty
identifying your location, press and release the RANGE
Down key to see the next lower map range.

4. After you have determined your approximate location on the
map, press ENTER.
NOTE: This does not calibrate the unit in any way, rather it
helps to speed up the initial satellite acquisition. If the unit
shows “Ready for Navigation” during this process, it is not
necessary to initialize the unit.

The unit now begins searching for the appropriate satellites for
your region and should acquire a ﬁx within a few minutes. When
viewing the GPS tab on the Main Menu, a signal strength bar for
each satellite in view appears on the bottom of the page, with the
appropriate satellite number under each bar.
• No signal strength bars—the receiver is looking for the
satellites indicated.
• Hollow signal strength bars—the receiver has found the
indicated satellite(s) and is collecting data.
• Solid signal strength bars—the receiver is ready to use.
When the receiver has collected information from at least
three satellites, the top of the screen shows either “Ready for
Navigation”, and the GPSMAP 392/398/492/498 is ready for use.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > SIMULATOR MODE

Simulator Mode

Simulator Mode turns the GPS receiver off for use indoors or
practice. You can perform any of the functions discussed in
the following pages in Simulator Mode. Keep in mind that the
GPSMAP 392/398/492/498 does not track satellites in Simulator
Mode, and this mode should never be used for actual navigation.
All the waypoint and route planning completed in Simulator Mode
is retained in memory for future use.
WARNING: Do not attempt to navigate using Simulator
Mode. When the unit is set to Simulator Mode, the GPS
receiver is turned off. Any satellite signal strength bars shown
are only simulations and do not represent the strength of actual
satellite signals.

GPSMAP 392/398/492/498 Owner’s Manual

To place the GPSMAP 392/398/492/498 in Simulator
Mode:

1. Press and hold ADJ/MENU to show the Main Menu. Use
the ROCKER to highlight the GPS tab, and then press
ADJ/MENU once.
2. Use the ROCKER to highlight Start Simulator, and press
ENTER.
3. Press QUIT to conﬁrm the Running Simulator message
that appears at the bottom of the screen. If the status bar
is turned on, “Simulating” appears at the top of each of the
main pages.
4. To turn off Simulator Mode, press ADJ/MENU, and select
Stop Simulator.

BASIC OPERATION > ADJUSTING THE BACKLIGHT
The Set Position,
Track Control, Track
and Speed ﬁelds
only show while in
Simulator Mode.

To adjust the simulated speed and heading from the
Compass or 3D Highway Pages:

1. Press up on the ROCKER increase the speed in
10 knot/kph/mph increments. Press down on the ROCKER
to decrease the speed in the same increments.
2. Press left or right on the ROCKER to steer the boat.

Adjusting the Backlight

To enter a simulated speed and heading from the
Main Menu:

1. Press and hold ADJ/MENU to show the Main Menu.
2. Use the ROCKER to highlight the Systm tab, and then
highlight the Setup button next to the Simulator ﬁeld on the
General sub tab. Press ENTER.
3. Highlight the Speed ﬁeld, and then press ENTER. Use the
ROCKER to enter a speed, and press ENTER.
4. Use the ROCKER to highlight Track Control. Press
ENTER, and select User Track.
5. Highlight the Track ﬁeld, and press ENTER. Use the
ROCKER to set the track.
6. Highlight Set Position, and press ENTER to change the
simulated location.
7. Press QUIT until you return to the Map Page.
4

The adjustable screen backlighting is controlled with the POWER
key, and can be adjusted from any page.

To adjust the backlighting:

1. Press and release the POWER key. The adjustment slider
window appears.
2. Press the POWER key again and the user-deﬁned level of
backlighting starts. You can adjust this level by pressing up
or down on the ROCKER. If you press POWER one more
time, the backlight is at the maximum setting.
3. Press ENTER or QUIT when ﬁnished.
GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > INTERFACE KEYS

Interface Keys
POWER Key

RANGE Down/RANGE Up Keys

• Press and hold to turn the unit on or off.

• From the Map Page, press to zoom
in or out.

• Press and release to adjust backlighting.

• From the Sonar Page, press to scroll up or
down the range list.

PAGE Key
• Press to cycle through the main pages.

ROCKER Key

• Press to end an operation in progress and
return to the main page.

QUIT Key

����

• Press up, down, right, or left to move
through lists, highlight ﬁelds, on-screen
buttons and icons, enter data, or move the
map pointer.

����

• Press and release to cancel data entry or
exit a page.

ENTER/MARK Key

DATA/CNFG Key
• Press to toggle the display of a main page
with or without data ﬁelds.
• Press and hold to show the Main Page
Conﬁguration window.
GPSMAP 392/398/492/498 Owner’s Manual

• Press and release to view options for a page.

����

• Press and release to enter highlighted options
and data or conﬁrm on-screen messages.
• Press and hold at any time to mark your
current location as a waypoint.

ADJ/MENU Key

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���

����

����
����

���

����

• Press and hold to view the Main Menu.

NAV/MOB Key
• Press and release at any time to
view the Navigation Menu.
• Press and hold for MOB waypoint.

FIND Key
• Press to search for points such as user
waypoints, cities, and services.
5

BASIC OPERATION > ENTERING DATA AND SELECTING OPTIONS

Entering Data and Selecting Options

You can select and start options, and enter data to customize the
GPSMAP 392/398/492/498 to ﬁt your requirements. Use the
ENTER key and the ROCKER to select options, enter names and
numbers in data ﬁelds, and start your selections.

To select an on-screen button:

Some pages contain on-screen buttons. Use the ROCKER
to highlight an on-screen button, and press ENTER.

To select an optional feature:

1. With any page shown, press ADJ/MENU for the adjustment
menu. The adjustment menu shows a list of optional
features that are speciﬁc for that page. To select an option
requires movement of the cursor. This is referred to as
highlighting, selecting, or choosing an item.
2. Use the ROCKER to move the cursor (highlight) up and
down a list or up, down, left, and right on menus.
3. After you highlight a selection, press ENTER to start the
feature. Repeat this process to select an option from the list,
or press QUIT to return to the previous setting.

On-screen buttons

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > USING THE MAP POINTER

Using the Map Pointer

The map pointer is controlled by the ROCKER. You can pan to
map locations, mark and edit waypoints and routes, and review
position data of on-screen map items and waypoints. When you
move the map pointer over a map item, a highlighted description of
that item appears.

To pan the map:

1. Use the RANGE Down/RANGE Up keys to select a map
zoom range.
2. Use the ROCKER to move the map pointer. A data ﬁeld
appears at the top of the screen showing the bearing and
distance from your boat to the map pointer, along with the
latitude/longitude of the map pointer.
3. Press QUIT to re-center your boat on the Map Page.
Map pointer
coordinates

Present
location

Distance
Map pointer
Map zoom range

Present
location

The Map Page actively scrolls or pans enabling you to explore
areas around the world and create waypoints and routes. Press
QUIT to return the map to your present location.
NOTE: When the map pointer reaches the edge of the map, the
unit might pause as it loads new map data.
GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > CREATING AND USING WAYPOINTS

Creating and Using Waypoints

The GPSMAP 392/398/492/498 stores up to 3,000 alphanumeric
waypoints with a user-deﬁned symbol, comments, depth, and water
temp, available for each waypoint. Waypoints can be created using
two basic methods:
ENTER/MARK Key—marks your present location, and provides
options to select a map location or map item from the Map
Page. Also, you can enter a new waypoint’s location coordinates
manually.
Graphically—deﬁnes a new waypoint location from the Map Page
using the ROCKER.
Waypoint
symbol

Name

Waypoint
coordinates
Water
depth

Comment
Water
temperature

Waypoint Review Page

Reference
from current
position

ENTER/MARK Key

Use the ENTER/MARK key to quickly capture your present
location to create a new waypoint. The unit must have acquired at
least three satellites to mark your present location. You can also use
this option to manually enter waypoint coordinates.
To mark your present location:

1. Press and hold ENTER/MARK until the New Waypoint
window appears. A default four-digit name and symbol are
created for the new waypoint.
2. To accept the waypoint with the default name and symbol,
highlight OK, and press ENTER/MARK.
3. To enter a different name, highlight the name ﬁeld, and
press ENTER/MARK. Use the ROCKER to enter the new
alphanumeric name, and press ENTER/MARK when
ﬁnished. You can use up to 10 characters for the name.
4. To select a different symbol, highlight the symbol ﬁeld to
the left of the name, and press ENTER/MARK. Use the
ROCKER to highlight the new symbol, and press
ENTER/MARK.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > CREATING AND USING WAYPOINTS
5. To enter optional comments or a depth, highlight the
Comments, Depth, or Water Temp, and press
ENTER/MARK, use the ROCKER to enter a value,
and press ENTER/MARK.
6. To manually enter a set of coordinates, highlight the location
coordinates, and press ENTER/MARK, use the ROCKER to
enter the new coordinates, and press ENTER/MARK when
ﬁnished.
7. Use the ROCKER to highlight OK. When ﬁnished, press
ENTER/MARK to save the waypoint into memory.

Creating Waypoints Graphically

You create waypoints graphically from the Map Page. To mark
a map location or map item, select the location or item with the
map pointer, and press ENTER. When selecting a location or map
item, a description of the point, its distance and bearing from your
current location, and the latitude/longitude of the map pointer is
shown along the top of the map.

GPSMAP 392/398/492/498 Owner’s Manual

To create a new waypoint graphically:

1. Use the ROCKER to move the map pointer to a map
location. If you want to create the new waypoint at an
on-screen map item, highlight the map item on the screen.
2. Press and release ENTER/MARK to capture the map
pointer location. Do not hold the button down, doing so
marks your present location, not the map location.
If you are not using a map item to create a waypoint, go to
step 4.
3. Highlight Create Wpt, and press ENTER/MARK.
4. To accept the waypoint with the default name and symbol,
press ENTER/MARK.
5. To change the name, symbol, or add a comment or depth,
highlight the appropriate ﬁeld, and press ENTER/MARK.
Make your changes, and press ENTER/MARK when
ﬁnished.
6. Highlight OK, and press ENTER/MARK to conﬁrm the
changes.

BASIC OPERATION > MAN OVERBOARD (MOB)

Man OverBoard (MOB)

The Man OverBoard function (MOB) simultaneously marks and
sets a course back to the marked location for quick response to
emergency situations.

The MOB function allows you to quickly start
navigation back to a location.

To start the MOB function:

When a MOB is active, a MOB waypoint with an international
MOB symbol is created and the unit is on an active navigation to
that point. Use any of the Navigation Pages to guide you back to
the MOB point. The MOB waypoint is stored in the waypoint list
and works like any other waypoint.

To stop navigation, press NAV/MOB highlight
Stop Navigation, and press ENTER.

1. Press and hold NAV/MOB.
2. Press ENTER to begin navigating to the MOB location.
3. To stop navigation to the MOB location, press NAV,
highlight Stop Navigation, and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > REVIEWING AND EDITING WAYPOINTS

Reviewing and Editing Waypoints

You can review, modify, rename, move, or delete waypoints at any
time using the Waypoint Edit Page. The Waypoint Edit Page is
available for any stored waypoint. Select the waypoint on the map
or from the waypoint lists in the Main Menu—Points tab.

Sub tabs

3. From the Waypoint Edit Page, change the name, symbol,
comment, postion coordinates, depth, or water temp for the
selected waypoint. When ﬁnished, highlight Next, and press
ENTER to save them. Press QUIT to cancel.
Name

Symbol

Comment

Postion
coordinates

Water
temp

Depth

Waypoint list
Waypoint Edit Page

To access the Waypoint Edit Page:

1. Use the ROCKER to highlight the waypoint on the Map
Page.
OR
Press and hold ADJ/MENU, highlight the Points tab, and
choose a waypoint from the User or Proximity sub tabs.
2. Press ENTER to show the Waypoint Edit Page.

GPSMAP 392/398/492/498 Owner’s Manual

To change the waypoint name:

1. Highlight the waypoint name ﬁeld, and press ENTER.
2. Use the ROCKER to enter a new name, and press ENTER
when ﬁnished.

BASIC OPERATION > NAVIGATING TO A DESTINATION

To change the waypoint symbol:

1. Highlight the waypoint symbol ﬁeld to the left of the
waypoint name, and press ENTER.
2. Use the ROCKER to select a new symbol, and press
ENTER.

To change the Comment, Location, Coordinates,
Depth, or Water Temp:

1. Highlight a ﬁeld, and press ENTER.
2. Use the ROCKER to edit or enter the data. To move to the
next character, press right on the ROCKER.
3. Press ENTER when ﬁnished.

To move the waypoint on the map:

Navigating to a Destination
Using the Nav Key

The NAV key provides four ways to navigate to a destination:
Go To Point, Follow Route, Follow Track, and TracBack. When
you are actively navigating, the Map Page shows a straight line
from your current location to the destination. The Go To option is
the easiest method for selecting a destination. A Go To allows you
to select a destination point and quickly set a direct course from
your present location. If you have a point highlighted on a list or
the map, Go To appears in addition to Go To Point.
The Go To function is accessed from any list of points or
graphically from the Map Page.

1. From the Waypoint Edit Page, highlight Move Wpt, and
press ENTER. A MOVE label now appears under the map
pointer in addition to a distance, bearing, and coordinate
window. You can also use the RANGE Down and RANGE
Up keys to zoom the map. The map zoom range appears in
the lower-right corner.
2. Use the ROCKER to point to the new location, and press
ENTER.
3. To stop the move process, press QUIT.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > NAVIGATING TO A DESTINATION

To start a Go To from a point list:

1. Press NAV. Highlight Go To Point, and press ENTER.
2. From the Find menu, highlight Waypoints or another menu
option, and press ENTER.
3. To select a waypoint from the waypoint lists, use the
ROCKER to highlight either the By Name or Nearest tab,
select a waypoint, and press ENTER.

Selecting a Go To Graphically

A Go To can be used to select one of three items from the
Map Page: an existing waypoint, an on-screen map item such
as roads, rivers, cities, and navaids, or a new map point. If
you are selecting a map item as the Go To destination, the
GPSMAP 392/398/492/498 automatically uses the name of the
map item, but the point is not stored in the waypoint list. See page
8 for creating waypoints using map items. If you are selecting
a new map point (non-map item) as the Go To destination, the
GPSMAP 392/398/492/498 automatically creates a waypoint at the
map pointer location.
To Go To an existing waypoint or map item from the
Map Page:

1. Use the ROCKER to highlight the waypoint or on-screen
map item.
2. Press NAV. Go To appears.
3. Press ENTER to start navigating to the waypoint.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > NAVIGATING TO A DESTINATION

To Go To a new map point (non-map item):

1. Use the ROCKER to move the map pointer to location.
2. Press NAV.
3. With Go To MAP Point highlighted, press ENTER.

TracBack Navigation (Navigating a Track)

The TracBack function retraces your path to the starting point
using the track log automatically stored in the receiver’s memory.
This feature eliminates the need to store waypoints along the way.
TracBack routes are created by reducing your track log into a route
of up to 300 turns and activating an inverted route along those
points. When started, a TracBack route leads you back to the oldest
stored track log point, so it is a good idea to clear the existing track
log before you start your current trip.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > NAVIGATING TO A DESTINATION

To clear the track log:

1. Press and hold ADJ/MENU to show the Main Menu.
2. Using the ROCKER, highlight the Track tab, and then
highlight the Active sub tab.
3. Use the ROCKER to select the Clear button, and press
ENTER.
4. Highlight OK, and press ENTER.

To save a track log:

1. From the Main Menu, use the ROCKER to highlight the
Track tab, then highlight the Active sub tab to the right.
2. Use the ROCKER to select Save, and press ENTER.
3. From the Save Back Through window, highlight time,
date, or Entire Log, and press ENTER. When the track is
saved, the Save Track window appears. The default name,
distance, number of points (700 max), and color are shown
in the Save Track window.
To change the name of the saved track, highlight the name
ﬁeld, and press ENTER. Make your changes and press
ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

To show the track on the Map and 3D Highway Pages,
highlight the check box to the left of Show on map and
highway, and press ENTER.
To view the track on the map, highlight Show Map, and
press ENTER.
4. Highlight OK, and press ENTER to save the track.
Default track name
Total distance
Check this box
to show track on
the Map or 3D
Highway Pages.

Total number of points
Change color
of track line

BASIC OPERATION > NAVIGATING TO A DESTINATION

To start a TracBack using the NAV key:

1. Press NAV, highlight TracBack, and press ENTER.
2. To stop TracBack navigation, press NAV, highlight Stop
Navigation, and press ENTER.

When a TracBack is active, the GPSMAP 392/398/492/498
takes the track log currently stored in memory and divides it
into segments called legs. Up to 300 temporary turns (BEGIN,
TURN 1, TURN 2, TURN 3,...., TURN X, END) are created
to mark the most signiﬁcant features of the track log in order to
duplicate your exact path as closely as possible. To get the most out
of the TracBack feature, remember the following tips:
• Always clear the track log at the starting point.
• Set the Record Mode option on the track log setup page to
Fill or Wrap.
• The track log memory must contain at least two points to
create a TracBack route.
• If the track log interval is set to the Time option, the route
can not follow your exact path. For best performance, keep
the interval set to Resolution.
• If the receiver is turned off or satellite coverage is lost during
your trip, the TracBack draws a straight line between any
point where coverage was lost and where it resumed.
16

• If the track log’s changes in distance and direction are
too complex, 300 waypoints might not mark your path
accurately. The receiver then assigns the 300 waypoints
to the most signiﬁcant points of your track, and simpliﬁes
segments with fewer changes in direction.
For more information on setting up the Track options and saved
tracks, see page 57.

Following a Track

The Following a Track function retraces a track from the
beginning, the oldest time, to the end, the newest time. You can
only use this function with Saved Tracks. To save a track, refer to
the instructions on page 15.
To Follow a Track:

1. Press NAV, highlight Follow Track, and press ENTER.
2. Highlight the track you want to follow, and press ENTER.
3. To stop Follow Track navigation, press NAV, highlight Stop
Navigation, and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > ROUTES

Creating and Using Routes

You can create and store up to 50 user-deﬁned reversible routes
(numbered 1-50), with up to 300 points each.

Route Tab

To navigate a QUICK NAV route:

1. Press NAV/MOB, and highlight Follow Route.
2. Press ENTER, and highlight Create QUICK NAV Route.
3. Use the map pointer to select a waypoint or map item, and
press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

4. To add a new waypoint to the route, use the map pointer to
select a map location, and press ENTER.
As you add each new waypoint to the route, the data
window at the top of the Map Page shows the waypoint/map
item name, bearing and distance from your location, and
coordinates of the map pointer. The bottom of the screen
shows the number of available points. A route line appears
on the map to indicate each completed leg, and a dotted
line appears indicating the distance and bearing to the map
pointer from the last route waypoint.
5. Repeat steps 3 and 4 until you have ﬁnished deﬁning all
route waypoints.
6. Press QUIT twice to start your QUICK NAV Route.

To create a new route using the map window:

1. Press and hold ADJ/MENU to show the Main Menu.
2. Use the ROCKER to highlight the Route tab, and press
ADJ/MENU to show the Route Options Page.
3. Select New Route, and press ENTER.
4. Follow steps 3 and 4 in the Navigating a QUICK NAV Route
instructions.
5. When ﬁnished, press QUIT twice to return to the Route List
Page.

BASIC OPERATION > ROUTES

ADD appears below the map
pointer as you insert points.

To create a route using the Route list:

1. Press and hold ADJ/MENU to show the Main Menu.
2. Use the ROCKER to highlight the Route tab, and press
ADJ/MENU to show the Route Options menu.
3. Select New Route, and press ENTER.
4. Press ADJ/MENU, select Use List, and press ENTER.
5. Use the ROCKER to highlight the ﬁrst available blank route
slot, and press ENTER.
6. Select a category, press ENTER, and select the ﬁrst point in
your route.
7. Repeat steps 5 though 6 until your route is complete, and
then press QUIT.
18

Choose the category from which you
want to add a route point.

To navigate a saved route:

1. From any page, press NAV.
2. Use the ROCKER to highlight Follow Route, and press
ENTER.
3. Highlight Pick From Saved List, and press ENTER.
4. Highlight the route you want to navigate, and press ENTER.

To stop navigation of a route:

Press NAV, highlight Stop Navigation, and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > FIND

The following options are available on the Navigation menu by
pressing NAV while navigating a route:
• Invert Route—reverses the route so you can follow it from
the end point back to the beginning.
• Re-Evaluate Route—recalculates and reactivates the current
route data. Selects the route leg closest to your current
location as the active leg (the active leg deﬁnes the current
from and to waypoints).

Find

The FIND key searches the unit for Waypoints, Cities, Tides,
Anchorages, Businesses, Exits, Navaids, Restricted Areas, and
Wrecks Obstructions. If you press FIND while in Pan Mode, the
unit centers its search from the location where the map pointer is
located. Your location or the map pointer must be within a map
outline area to search for BlueChart g2 information.

Find Items List

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > FIND

To Find an item from your current location:

1. From any page, press FIND.
2. Using the ROCKER, highlight a category from the list, and
press ENTER.
3. For waypoints and cities, search using By Name or
Nearest. Use the ROCKER to highlight a tab. For By
Name, use the top ﬁeld to spell out the name, or scroll down
through the list. (See page 8 for steps on entering a name.)

To Find an item from other locations:

1. From the Map Page, use the ROCKER to pan select a
location, and press FIND.
2. Using the ROCKER, highlight a category from the list, and
press ENTER.

You can also Find
items using the
Map Pointer.

The Find option also supports a “ﬁnd from” feature that centers
your search around an item you have just found. For example,
you search for “Restricted Areas” and you ﬁnd a point named
“Anchoring Prohibited.” If you press FIND again, “From
Anchoring Prohibited” appears as the new ﬁnd from point.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > ADDITIONAL INFORMATION AND DSC

Additional Information

Each item on the map has information about the point available.
The information varies depending on the type of data loaded on
the optional data card. Sub tabs along the top of the detail window
contain the information available for the item. Any additional
options are shown along the bottom.
To view additional information for a Map item:

1. On the Map Page, use the ROCKER to highlight a map
item, and press ENTER.
2. Use the ROCKER to highlight the individual tabs, and show
the information. To scroll the text, highlight the ﬁeld, and
press ENTER. Use the ROCKER to scroll.

DSC (Digital Selective Calling)

The DSC tab controls and sets up the DSC features on the
GPSMAP 392/398/492/498.
DSC uses marine VHF radio and GPS technologies to transmit
and receive location information. The chartplotter repeats the call
properties received from the VHF radio on the chartplotter. The
GPSMAP 392/398/492/498 requires input from a DSC-enabled
VHF radio to show position, and sound/show alerts from a distress
call or position report. Conversely, the VHF radio requires input
from a GPS to transmit position coordinates for a distress call or
position report. For connection information, refer to “Connecting
the Power/Data Cable” on page 92.
An emergency DSC distress call allows a vessel in trouble
to transmit a substantial amount of information in a single
transmission or call, without the need for voice communication.
When any nearby rescuer receives the DSC signal, an alarm sounds
and they immediately receive the location of the caller. The rescuer
can choose to navigate to the caller’s location to assist, or forward
the call on to the Coast Guard. When the Coast Guard receives the

Additional
information tabs
Distance, Bearing,
and Coordinates of
item
Additional options
Information Window

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > DSC

call, they can immediately access the caller’s information (such as
who they are and the type of vessel) in their database while they
are in transit to the caller’s location.
A non-emergency DSC position report allows mariners to exchange
and show the positions of one another. When a DSC position is
received, the mariner can choose to create a waypoint or to show
the received location on an electronic map.

Understanding Position Reports

A position report is similar to a distress call except no alarm is
sounded. Position reports are not broadcast to all DSC users and
are shown with a boat symbol .

Anytime a vessel receives a DSC call, they can store and quickly
navigate to that location using a Go To. In order to use DSC, users
must ﬁrst register their VHF radio with the FCC and receive a
Maritime Mobile Service Identity (MMSI) number. Garmin does
not provide MMSI numbers.
For more information about Digital Selective Calling and Maritime
Mobile Service Identity (MMSI) numbers, refer to page 97 in the
“Appendix.”

Understanding Distress Calls

When the GPSMAP 392/398/492/498 receives a distress call
from a connected DSC-enabled VHF radio, an alert message and
notiﬁcation page are shown, and an alarm tone is sounded. Distress
Calls are shown in the DSC Call List and Log with a checkered
symbol .
22

Receiving DSC Calls

Each time you receive a distress call or position report, a
Notiﬁcation Page is shown, and the call is placed in the DSC Call
List and Log. The Notiﬁcation Page contains information about
the call including: the type of call (distress or position report),
the MMSI number of the caller, a user deﬁnable name, the time
and date of the call, the bearing and distance from your current
location, and the coordinates of the caller. To see the caller’s
location on a map, select the Show Map button. To create a
waypoint at the caller’s location, select the Create Wpt button. To
close the Notiﬁcation Page, press QUIT.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > DSC

When a distress call or position report is placed in the Call List and
Log, the information on the Notiﬁcation Page is retained. To review
a DSC call or log entry, highlight the entry and press ENTER. The
DSC Entry Review Page is identical to the Notiﬁcation Page with
one exception, the entry can be deleted.

DSC Call List
The DSC Call List shows the 50 most recent calls, even if the unit
is left unattended. The Call List shows the most recent call from a
vessel. If a second call from the same vessel is received, it replaces
the ﬁrst call in the Call List. Press MENU to sort the list and delete
entries.
DSC Log
When DSC calls are received, they are automatically placed in the
Log, with the most recent call at the top. The unit can log up to 100
calls. When 100 calls are logged, the oldest log is removed when a
new call is received. Press MENU to sort the list and delete entries.

DSC Entry Review Page

To review a call or log entry:

1. Press and hold ADJ/MENU to open the Main Menu.
2. Open the Call List or Log from the DSC tab.
3. Press up or down on ROCKER to highlight the call you want
to review.
4. Press ENTER to open the DSC Entry Review Page.

GPSMAP 392/398/492/498 Owner’s Manual

DSC Directory
The DSC Directory acts much like a phone book and can hold up
to 50 entries. Pressing MENU from this page shows options to add
a New Item, Delete a highlighted entry, or Delete All entries.
To add a new Directory entry:

1. Open the DSC Directory in the Main Menu.
2. Use the ROCKER to highlight the ﬁrst blank space in the
directory list, and press ENTER.
OR
Press MENU, highlight New Item, and press ENTER.

BASIC OPERATION > DSC
3. Enter the MMSI number, a name, and any comments.
4. When ﬁnished, highlight OK, and press ENTER.

Navigating to a Position Report or Distress Call

After a position report or a distress call is received, navigation can
be quickly set to the call location.

New Directory Item Page

When a distress call, position report, or directory item is named,
the name is attached to that particular MMSI number. If a name is
used, all DSC entries of the same MMSI number show the name.

Navigating to a DSC Call

To navigate to a position report or distress call using
the Nav key:
1 Press NAV.
2. With Go To MMSI/Name highlighted, press ENTER.

To navigate to a position report or distress call using
the DSC alert page:

1. Highlight the call on the Call List or Log, and press NAV.
2. With Go To MMSI/Name or DSC highlighted, press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

BASIC OPERATION > AIS

Setting up DSC

The DSC Setup tab turns DSC chartplotter information screen
On and Off. This also allows you to simulate distress calls and
position reports while the unit is in Simulator Mode (see page 3).
Simulating calls is helpful for practice before connecting to the real
system. The distress call simulator also helps to check if alarms are
working properly.

AIS

AIS (Automatic Identiﬁcation System) provides area trafﬁc
situational awareness. AIS provides ship IDs, position, course, and
speed for ships equipped with a transponder within range.
NOTE: You must set your charplotter communitcation to
NMEA In / NMEA Out with a baud rate of 38400 to receive
AIS information. Refer to page 69 for information on changing
communication settings.

AIS Setup options

AIS contains two setup options in the main menu.

DSC Setup

GPSMAP 392/398/492/498 Owner’s Manual

• AIS Vessels—Auto, All Ranges, 30ft-800mi: sets the
maximum zoom scale at which AIS vessels appear.
• Heading Line—Off, Time: draws an extension from the end
of the boat icon in the direction of travel. For Time, enter the
numeric time value you want the line to extend. The Time
line length automatically adjusts as your speed changes.

MAIN PAGES > OVERVIEW

MAIN PAGES
There are four main pages that are always available: Map, Compass, 3D Highway, and Active Route. Pressing PAGE opens a Pages
window. You can use the ROCKER or press PAGE repeatedly to cycle though the pages. Three more pages, Map Split, Sonar, and
Flasher, are available when the GPSMAP 392/398/492/498 Sounder receives sonar input. For information on the Sonar, Flasher, and Map
Split Pages, refer to the “Using Sonar” section on page 72.
With the Map Page shown, press PAGE several times. Each time you press PAGE the next main page appears. Each main page has an
Adjustment Menu, which contains the setup options and functions that apply to that page. Press ADJ/MENU to show the Option Menu.
Use the ROCKER to select an item from the adjustment menu, and press ENTER.
Notice that either PAGE or QUIT stops the current function and returns you to the main page. If you ﬁnd yourself lost in a menu or you
start a function you do not want, press PAGE or QUIT.
You can customize the main pages using the DATA/CNFG key. Press DATA/CNFG to remove the status bar and data ﬁelds from the top
of any main page. Press and hold DATA/CNFG to customize the Main Pages.

Map Page
26

Map Split Page

Sonar Page

Flasher Page

Compass Page 3D Highway Page Active Route Page
GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > MAP PAGE

Map Page

The Map Page provides a comprehensive display of electronic
cartography, plotting, and navigational data. When using the unit
with optional BlueChart or MapSource data, the Map Page shows
your boat on a digital chart, complete with geographic names, map
items, navaids, and a host of other chart features. It also plots your
track and shows any routes and waypoints you create. The map
pointer allows you pan and scroll to other map areas, determine the
distance and bearing to a location, and perform various route and
waypoint functions.
When the map pointer is active, an additional data window appears
at the top of the map to indicate the location, range, and bearing to
the map pointer, a selected waypoint, or map item. The map zoom
range shown at the lower-right corner of the Map.
The Zoom RANGE Down and RANGE Up keys combined with
the ROCKER, allow you select zoom ranges and move the map
pointer. Two basic map operating modes, Position Mode and Pan
Mode, determine what cartography is shown on the Map Page.
Position Mode moves the cartography to keep the present position
marker within the screen area. Pan Mode moves the cartography to
keep the map pointer within the screen area.

GPSMAP 392/398/492/498 Owner’s Manual

The GPSMAP 392/398/492/498 starts in Position Mode, with your
location centered on the Map Page. When sufﬁcient map coverage
is not available to keep your location centered, the position triangle
moves toward the edge of the screen.
Pan Mode starts when the ROCKER is pressed. The map pointer
is moved over the Map Page using the ROCKER. When the map
pointer reaches the edge of the screen, the map scrolls forward
under the map pointer.
Data ﬁelds
Map item

Water

Geographic
name

Position triangle

Land

Map zoom range
Map Page shown Using
Built-In Cartography Data

MAIN PAGES > MAP PAGE

Using the Map Pointer

The map pointer pans away from your present location (even
outside of your current detail coverage.) As you pan past the edge
of the current Map Page, the screen actively scrolls forward to
provide continuous map coverage. An hourglass symbol appears by
the map pointer while the unit is busy drawing new map details.

Move the map
pointer over an
item on the map
to highlight it.

As you move the map pointer, the distance and bearing from your
present location to the map pointer is shown in the data window,
along with the map pointer’s location coordinates. Keep in mind
that when the map pointer is stationary, the distance and bearing
from your present position changes as your location moves. The
map pointer can also be used to view on-screen waypoint and map
item properties directly from the Map Page.
28

Additional
information tabs
Pressing ENTER while
highlighting a map item
brings up additional
details and options.

Additional options

To select an on-screen waypoint or map item with the
map pointer:

1. Use the ROCKER to move the map pointer to a waypoint or
map item. (If there are several waypoints grouped closely
together, zoom in closer for a better view.) When a waypoint
or map item is selected, it is highlighted on-screen, with the
name and location shown.
2. Press ENTER to show details of the map item. When using
BlueChart g2 or MapSource data, additional information
tabs appear. Use the ROCKER to highlight the individual
tabs, and show information and options.
3. Press QUIT to exit the review page.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > MAP PAGE

Use the map pointer to create new waypoints directly from the
map.
To create a waypoint with the map pointer:

1. Use the ROCKER to move the map pointer to the map
location.
2. Press ENTER, and the New Map Waypoint window
appears. (Do not hold down ENTER. Pressing and holding
ENTER will mark a waypoint at your present position not at
the map pointer’s location.) If the map pointer is on a map
item, press ENTER, and a new window with details about
the item appears.
3. Press ENTER again on the highlighted Create Wpt option.
4. Press ENTER to conﬁrm the new waypoint using the default
four-digit name and symbol.

For more information about waypoints, see page 8.

Selecting Map Zoom Ranges

The Map Page has 28 available range scales from 20 ft to 800 mi
(5 m to 1,200 km.) The map zoom range is controlled by the
RANGE Down and RANGE Up keys, with the current zoom
range shown at the lower-right corner of the data window.
To select a map zoom range:

Press the RANGE Up key to zoom out and the RANGE
Down key to zoom in.
NOTE: The zoom range value represents the distance from one
end of the zoom range bar to the other.

Using Built-In Basemap

Using BlueChart g2 or MapSource Data

Overzoom, no additional data is available

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > MAP PAGE

Cartography

The GPSMAP 392/398 system contains a preloaded U.S. inland
freshwater cartography to its enhanced worldwide basemap
information. The preloaded inland maps offer 50-meter shoreline
resolution throughout the U.S., with even more detailed 10-meter
resolution on select lakes. Other details include depth contours,
tide and current data, boat ramps, mile markers, hazards, marinas,
campgrounds, area roads, and more.
The GPSMAP 492/498 system contains preloaded marine map
detail utilizing BlueChart® g2 technology. Coverage is for U.S.
coastal areas, including Alaska and Hawaii. Features include
integrated mapping, 2D or mariner's eye perspective, tide and
current data, improved IALA symbols, navaids, marinas, boat
ramps, roads, and more.
Both units accept preprogrammed data cards and are compatible
with the latest BlueChart® g2 series marine cartography. The unit
shows cartography as long as there is chart information available
for the range you have selected.

To change data ﬁeld contents and conﬁguration:

1. Press and hold DATA/CNFG. The Conﬁguration window
appears.
2. Using the ROCKER, highlight the function you want to add
or remove, such as the status bar or ﬁrst and second rows
of data ﬁelds, and press ENTER. Only functions with a
check mark in the check box to the left of the name appear
on the main page.
3. Move the ﬁeld highlight to the data ﬁeld slider and use the
ROCKER to select the number of data ﬁelds.
4. Move the ﬁeld highlight to a data ﬁeld, and press ENTER.
5. Using the ROCKER to move up or down on the list of data
ﬁeld options. Press ENTER to select an option.
6. To exit, press QUIT.

Map Page Options

Many features of the GPSMAP 392/398/492/498 are menu driven.
Each main page has an options menu, allowing you to customize
the corresponding page to your preferences and select special
features that speciﬁcally relate to that page.
The Map Page provides access to functions and features relating to
the Map Page.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > MAP PAGE

To show and select the Map Page options:

1. Press ADJ/MENU.
2. Use the ROCKER to highlight an option, and press ENTER.

The available options are Measure Distance, Show/Hide Detail,
and Setup.

To measure the bearing/distance between two points:

1. Highlight Measure Distance, and press ENTER. An
on-screen map pointer labeled ENT REF appears on the
Map Page at your present location.
2. Move the map pointer to a reference point (the point that
you want to measure from), and press ENTER.
3. Move the map pointer to the end measurement point. The
bearing and distance from the reference point and map
pointer coordinates is shown in the data window at the top
of the screen. Press QUIT to ﬁnish.

Map pointer
coordinates
Distance
and bearing

NOTE: Map Pointer, Highway, Location, and Sonar ﬁeld
options are only available on medium and large sized data
ﬁelds.

Map pointer

Measure Distance—measures the bearing and distance between
any two points on the Map Page.
Hide/Show Detail—hides and shows map details.
GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > COMPASS PAGE

Setup—conﬁgures the Map Page preferences, including map
detail, map orientation, automatic zoom, and various map items
and points. Refer to “Main Menu—Map Tab” on page 61 for more
information.
To change a map setup feature:

1. From the Map Page menu, highlight Setup, and press
ENTER.
2. Press left or right on the ROCKER to highlight a tab. Press
up or down on the ROCKER to highlight the setting you
want to change, and press ENTER.
3. Press up or down on the ROCKER to highlight to a setting,
and press ENTER. To exit, press QUIT.

From the map setup page, you can access the following menu
options by pressing ADJ/MENU:
• All Map Defaults—restores settings back to factory settings
for all tabs.

Compass Page

The Compass Page provides graphic steering guidance to a
destination waypoint, with an emphasis on the bearing to your
destination and current direction of travel. The middle of the
page features a rotating compass ring that shows your course
over ground (track) while you are moving, and a bearing pointer
that indicates the direction of the destination (bearing) relative
to the course over ground. The compass ring and map pointer
work independently to show—at a glance—the direction of your
movement and the direction to your destination. For instance, if
the arrow points up, you are going directly to the waypoint. If the
arrow points any direction other than up, turn toward the arrow
until it points up, and then continue in that direction.
This page provides better steering guidance when traveling at
slower speeds and when making frequent directional changes.
When you are not navigating to a waypoint, the compass ring
shows the current direction of travel but the arrow does not appear.
NOTE: The bearing pointer, bearing bug, and compass ring
can point in various directions when you are stationary or at
very low speeds. When you start moving, the map pointer is
correct.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > HIGHWAY PAGE
Data
ﬁelds
Bearing
bug

Bearing
pointer

Compass
ring

The data window, located at the top of the page, provides a userselectable layout of various types of useful data. Each data ﬁeld
can be conﬁgured to show several data options. The data window
layout can be conﬁgured to show additional data ﬁelds and change
the size of the data shown. The round compass becomes a tape
compass when the data conﬁguration limits space. Refer to page 30
for data ﬁeld conﬁguration instructions.

GPSMAP 392/398/492/498 Owner’s Manual

3D Highway Page

The 3D Highway Page provides mariner's eye perspective for
guidance to a destination waypoint, placing greater emphasis on
the straight-line course, and the distance and direction you are off
course. As you head toward your destination, the middle of the
screen provides visual guidance to your waypoint on a moving
graphic highway. Your present location is at the bottom center
of the 3D Highway Page. Mariner's eye perspective provides
situational awareness while navigating. The line down the middle
of the highway represents your course. As you navigate toward a
waypoint, the highway moves—indicating the direction you are off
course. To stay on course, steer toward the center of the highway.

MAIN PAGES > HIGHWAY PAGE

The four data ﬁelds at the top of the page provide additional
user-selectable guidance information. A compass ribbon shows
your current heading along with a dark, vertical bar that indicates
the direct bearing to the navigation point. When the dark vertical
indicator (or arrow) lines up with the lighter red bar in the middle,
you are heading directly to the navigation point. Use the 3D
Highway Page as your primary navigation page in lieu of the
Compass Page when your main concern is following a deﬁned
course.

Each data ﬁeld at the top of the page can be conﬁgured to show
several data options. The data window layout can be conﬁgured to
show additional data ﬁelds and change the size of the data shown.
Refer to page 30 for more information.
To zoom in or out on the 3D Highway Page:

Press either the RANGE Down or RANGE Up key to
increase or decrease the zoom range.

Data ﬁelds
Compass
tape
Course
Present
location

Zoom
range

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > HIGHWAY PAGE

3D Highway Page Options

The 3D Highway options page selects the waypoints and tracks
shown and shows/hides cartography.
To show and select the 3D Highway Page options:

1. Press ADJ/MENU. Select the Hiway tab.
2. Using the ROCKER, highlight an option, and press ENTER.
Check or uncheck
the options you
want to show or
hide on the 3D
Highway Page.

The following options are available from the 3D Highway Page
menu:
• Hide/Show Cartography—toggles between hiding and
showing map details. This option is only available when an
optional cartography data card is inserted in the unit.
• Setup—selects what waypoints and tracks are shown on the
3D Highway Page. Use the ROCKER and ENTER keys to
select or deselect the options.

Preview window

3D Highway Page Setup

GPSMAP 392/398/492/498 Owner’s Manual

MAIN PAGES > ACTIVE ROUTE PAGE

Active Route Page

The Active Route Page shows each point of the active route, with
the point name, distance and choice of Course, ETA, Fuel, Leg
Distance, Leg Fuel, Leg Time, Sunrise, Sunset, or Time To for each
point from your present location. The current destination point is
marked with an arrow icon. As you navigate a route, the waypoint
list automatically updates to indicate the next active point ﬁrst. The
Active Route and Route Review Pages share many of the same
features and options. For more information on the Active Route
Page, see page 17.

Active Route Page Options

The Active Route Page Options function the same as the Map Page
Options. Refer to pages 17-19 for information on the Use Map,
Add Before, and Remove options.

Active Route Page

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > GPS TAB

MAIN MENU
The Main Menu provides access to various waypoint, system,
navigation, interface management, and setup menus. The 19 Menu
tabs are divided into categories by function. The Main Menu is
available from any page in the system, and is accessed by pressing
and holding ADJ/MENU. See page 6 for additional instructions on
changing settings and entering data.
Sub tabs

To select a Menu tab from the Main Menu:

1. Press up or down on the ROCKER to highlight a tab. The
information for the highlighted tab automatically appears
to the right. If you want to select any of the sub tab items,
press right on the ROCKER, then press up or down to
select individual items.
2. Either press ADJ/MENU for additional submenu options,
or press ENTER to make changes to the highlighted item.
Press left on the ROCKER to get back to the Main Menu.
3. Press QUIT to exit the Main Menu.

GPS Tab
Main menu
tabs

Main Menu

GPSMAP 392/398/492/498 Owner’s Manual

The GPS tab provides a visual reference of satellite acquisition,
receiver status, and accuracy. The status information provides
an idea of what the receiver is doing at any given moment. The
sky view and signal strength bars give you an indication of what
satellites are visible to the receiver and whether or not they are
being tracked. The signal strength is shown on a bar graph for each
satellite, with the satellite number below. As the receiver locks onto
satellites, a signal strength bar appears for each satellite in view.

MAIN MENU > GPS TAB

Accuracy

Receiver status
WAAS status

Signal strength
bars

The status ﬁeld indicates “Ready for Navigation” when the
GPSMAP 392/398/492/498 has collected the necessary data from
satellites to calculate a ﬁx. The unit then updates the location, date,
and time.
You can use the sky view to help determine if any satellites are
being blocked, and whether you have a current location ﬁx. The
sky view shows a bird’s-eye view of the position of each satellite
relative to the receiver’s last known location.

The outer circle represents the horizon (north up), the inner
circle 45º above the horizon, and the center point a position
directly overhead. You can also set the sky view to a Track up
conﬁguration, causing the top of the sky view to align along your
current track heading.
• Searching for Satellites—the receiver is looking for and
collecting data from satellites visible at its last known or
initialized position, but has not collected enough data to
calculate a ﬁx.
• Ready for Navigation—at least three satellites have been
acquired and your location is now being calculated in
latitude, longitude, and elevation.
• Ready for Nav with WAAS—at least three satellites and
a WAAS/EGNOS satellite have been acquired and your
location is now being calculated in latitude, longitude, and
elevation.
• Simulating—the receiver is in Simulator Mode.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > GPS TAB

GPS Tab Options

The GPS tab features an options page that provides access to
functions and features relating to the GPS Info Page.
To show and select the GPS Tab options:

To Disable/Enable WAAS capability:

1. From the GPS tab, press ADJ/MENU.
2. Use the ROCKER to highlight WAAS Off or WAAS On, and
press ENTER.

1. Press ADJ/MENU to open the Main Menu.
2. Using the ROCKER, highlight an option, and press ENTER.

Highlight WAAS Off, and press ENTER to
disable the WAAS capabilities.
GPS Tab Options

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TIDE TAB

Tide Tab

Use the Tide tab to view tide and current information. The Tide tab
contains two sub tabs: Tide and Current.
Station
name
Date
Tide
chart
Event
times

Tide Tab

Tide Sub Tab

The Tide sub tab contains a graphical chart that shows Tide Station
information in a 24-hour span starting at midnight. You can choose
from different dates and more than 3,000 Tide Stations around the
U.S.A. coastline, Alaska, Hawaii, western Canada, and several of
the Caribbean islands. The top of the Tide sub tab shows the Tide
Station, the date, and the distance and bearing to the Tide Station
from your location.
40

The bottom of the Tide chart shows a 24-hour block of local time
for your location. Daytime (yellow bar) and nighttime (blue bar)
at the Tide Station are shown across the time scale, with the time
progressing from left to right (sunrise and sunset information might
not be available for some Tide Stations). The solid, light vertical
lines are in 4-hour increments, and the light, dotted vertical lines
are in 1-hour increments. A solid, vertical line (with the local
time at the top) indicates the tide height corresponding to the time
shown in the local time box.
Max. level

Current tide
height bar

High tide
curve

Current
time bar

Low tide curve

MLLW

Min. level
Station time

Day

Night

The Tide curve is shown as a shaded area, where higher tides are
taller (blue) and lower tides are shorter (red). The solid, horizontal
line indicates the tide height. The ﬁgure to the left of the line shows
the present tide level. The Mean Lower Low Water (MLLW)
appears as a solid, horizontal line near the bottom of the chart
(this line appears only if the tide height range is zero or below).
GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TIDE TAB

The numbers on the top and bottom of the left side indicate the
maximum and minimum levels. The four data ﬁelds below the
chart indicate event times and levels at which the tide changes
starting in the upper-left ﬁeld, going downward, then to the upperright, and down again. When comparing with other tide tables,
verify the depth unit value is the same for both sources. The bottom
of the chart shows the amount of time (in hours and minutes) until
the next low tide and high tide.
To select the Tide Station nearest to your location:

1. Highlight the At ﬁeld, and press ENTER to open the Find
Tides Page.
2. Highlight Current Position, and press ENTER to open the
Find Near Current Position Page.
3. Select a Tide Station from the list, and press ENTER. As
you move the highlight over each Tide Station in the list, the
station is highlighted on the Map window. The distance and
bearing from your location to the highlighted Tide Station
are shown at the bottom of the list.

If you are not within this range, the message “None Found”
appears. Use the Map Position option to select a location closer to
a Tide Station.

GPSMAP 392/398/492/498 Owner’s Manual

Select from a list of Tide Stations.

To select a Tide Station from a map location:

1. Highlight the At ﬁeld, and press ENTER to open the Find
Tides Page.
2. Highlight Map Position, and press ENTER to open the Find
Near Current Position Page.
3. Press up or down on the ROCKER to move the map
pointer to a map location, and press ENTER. The Find Near
Other Position Page shows a list of Tide Stations near the
selected map location.
4. Select a Tide Station, and press ENTER. If the “None
Found” message appears, repeat steps 1-3 until you ﬁnd a
Tide Station.
41

MAIN MENU > TIDE TAB

Viewing Tide Information
You can change the date to see tide charts for other days, or move
the time bar in approximately ﬁve-minute increments to show tide
heights at various times.
To change the date of the tide chart:

1. Using the ROCKER, highlight the On ﬁeld, and press
ENTER.
2. Enter a date, and press ENTER. The tide chart is updated
to show tide information for the selected date.

To view tide heights at various times on the tide chart:
1. Highlight the tide chart.
2. Press left or right on the ROCKER to change the time and
day. The day changes as you move past the edge of the
tide chart.

Move the ROCKER
to see tide heights at
different times. Tide
data shows in a black
box when in map
pointer mode.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TIDE TAB

Current Sub Tab

The Current sub tab contains graphical charts showing information
for currents in a 24-hour span starting at midnight. You can choose
from different dates and Current Stations around the U.S.A.
coastline, Alaska, Hawaii, western Canada, and several of the
Caribbean islands. The top of the Current sub tab shows the current
station, and the date. The bottom of the tab shows the distance and
bearing from your location.
The Current sub tab contains two charts—one for speed and one
for direction.

The top chart is the speed chart, which shows the speed of a given
current at any point during the day. The shaded area is blue (Flood
Current) when the current is heading toward shore; the shaded area
is red (Ebb Current) when the current is heading away from shore.
The bottom chart is the direction chart, which shows the direction
of the current at any given point during the day (based on the north
reference, not true north.)
The bottom of each chart shows a 24-hour block of local time for
your location. Day (yellow bar) and night (blue bar) at the Current
Station appear across the time scale, with the time progressing
from left to right (sunrise and sunset information may not be
available for some stations). The solid, light vertical lines are in
4-hour increments, and the light, dotted vertical lines are in 1-hour
increments. A solid, vertical line (with the local time at the top)
indicates the strength of the current that corresponds to the time
shown in the local time box.
To select the Current Station nearest to your location:

1. Highlight the At ﬁeld, and press ENTER to open the Find
Currents Page.
2. Highlight Current Position, and press ENTER to open the
Find Near Current Position Page.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TRIP TAB
3. Select a Current Station from the list, and press ENTER. As
you move the highlight over each Current Station in the list,
the station is highlighted on the Map window. The distance
and bearing from your location to the highlighted station are
shown at the bottom of the list.

To select a Current Station from a map location:

1. Highlight the At ﬁeld, and press ENTER to open the Find
Currents Page.
2. Highlight Map Position, and press ENTER to open the Find
Near Map Position Page.
3. Press up or down on the ROCKER to move the map pointer
to a map location, and press ENTER. The Find Near Map
Position Page shows a list of Current Stations near the
selected map location.
4. Select a Current Station, and press ENTER. If the “None
Found” message appears, repeat steps 1-3 until you ﬁnd a
station.

Trip Tab

The Trip tab shows the Trip Odometer, Moving Average speed,
Total Average speed, Maximum Speed, Stopped Time, Moving
Time, Total Time, and Odometer. To reset the data, choose from
Reset Trip, Reset Max Speed, Reset Odometer, or Reset All, and
press ENTER.

Viewing a Current Report
Press the Show Report soft key to view a detailed report of all
times and values for all the minimum and maximum current ﬂows
through the day including Flood, Slack, and Max Ebb times and
strengths.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > CELES TAB

Celes (Celestial) Tab

To choose a different location:

The Celestial tab shows celestial data for sun and moon rise and
set, moon phase, and the approximate sky view location of the sun
and moon. The moon phase shows the current visible portion of
the moon as a light color. You can show this data for your present
location, a location from the map, or a Find item location. You can
use today’s data, or select a different date and time.

Position
Date/Time
Sky view
window

Sun/Moon
event times

Sun
position
Overhead
(90°)

1. From the Celes tab, highlight the At ﬁeld, and press
ENTER.
2. From the Find list, highlight any category, and press
ENTER. If you want to reference a Find item, select from
the Find list, and press ENTER.
3. Select an item from the list or tab lists, and press ENTER.
For a location from the map, choose Map Position, press
ENTER, select a location on the map, and press ENTER.
4. From the Find item detail page, highlight OK, and press
ENTER.

The location the unit is using appears in the Date/Time/Position
ﬁeld. The time tables shown are based on your current time zone.
When using a position from another location outside of your time
zone, you need to set the time zone for that location. See page 68
for more information on setting time zones.

Moon phase
70°

45°

Horizon
(0°)

GPSMAP 392/398/492/498 Owner’s Manual

Moon
position

MAIN MENU > POINTS TAB

Points Tab

The Points tab contains two waypoint sub tabs, User and Proximity,
which allows you to manage a large number of waypoints quickly
and efﬁciently. The sub tabs also provide continuously updated
proximity waypoint alarms that can be used to deﬁne items, such as
submerged hazards or shallow waters.

Celestial Tab Menu

To change the time or date:

1. On the Celestial tab, use the ROCKER to highlight the
Days or Hours button, and press ENTER. Press up or
down on the ROCKER to change the days or hours. Press
QUIT to exit.
OR
Highlight the On ﬁeld, and press ENTER.
2. Enter a new date or time, and press ENTER.

Points Tab

To use the current date and time:

From the Celes tab, press ADJ/MENU, use the ROCKER to
highlight Use Current Date and Time, and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > POINTS TAB

To select the Points sub tab:

1. Use the ROCKER to highlight the Points tab. A list of stored
waypoints appear to the right of the Main Menu list.
2. Press right one time on the ROCKER. The User tab is now
highlighted.
3. Press down on the ROCKER until a waypoint is highlighted.

User Waypoint List

The User list on the points tab shows a master list of all waypoints
currently stored in memory. From the User list, you can review,
edit, rename or delete individual waypoints, or delete all user
waypoints. The total number of stored and available waypoints is
shown at the bottom of the User page, with the stored waypoints
arranged in alphanumerical order.

GPSMAP 392/398/492/498 Owner’s Manual

The following options are available:
• New Waypoint—allows you to create a waypoint.
(See page 8 for creating a waypoint)
• Delete—deletes selected waypoint from and waypoint list
and route.
• Delete By Symbol—deletes waypoints that use the same
symbol.
• Delete All—deletes all waypoints from the unit.
NOTE: When a waypoint is deleted from the list, it cannot be
recovered from the unit. It is advisable to back up important
waypoints to a computer using an optional PC cable and
interface software or record them manually.

MAIN MENU > POINTS TAB

To show the waypoint menu options:

Using the ROCKER, highlight the User tab, and press
ADJ/MENU.

To scroll through and review the waypoint list:

1. With the ROCKER, highlight the Points tab, and then
highlight the User sub tab.
2. Use the ROCKER to scroll through the list.
3. Press ENTER to review the highlighted waypoint on the
Waypoint Edit Page.
4. Press ENTER to return to the list and automatically highlight
the next waypoint.

To delete an individual waypoint from the list:

1. Use the ROCKER to highlight the waypoint to delete, and
press ADJ/MENU.
2. Highlight Delete, and press ENTER. You can also highlight
the waypoint, press ENTER, then highlight Delete, and
press ENTER.
3. Press ENTER to delete the selected waypoint.

To search for a waypoint by name:

1. Highlight the name ﬁeld, and press ENTER.
2. Use the ROCKER to select the ﬁrst letter of the name.
3. Press right on the ROCKER, and enter the second letter, if
you do not see the name in the list below.
4. Repeat steps 2 and 3 until the name appears. Press
ENTER when you see the name.
5. Highlight the name on the list, and press ENTER again
to review the waypoint. When ﬁnished, highlight OK, and
press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > POINTS TAB

To delete waypoints by symbol:

1. From the User sub tab, press ADJ/MENU. Select Delete
By Symbol, and press ENTER.
2. Use the ROCKER to highlight the symbol of the waypoint(s)
to delete, and press ENTER.
3. Press ENTER to delete the waypoint by symbol. Otherwise,
choose Cancel, or press QUIT.

To delete all waypoints or the entire waypoint list:

1. Press ADJ/MENU to select the options window.
2. Use the ROCKER to highlight Delete All, and press
ENTER.
3. Highlight OK, and press ENTER to delete all waypoints.

GPSMAP 392/398/492/498 Owner’s Manual

Proximity Waypoint List

Use the Proximity list to deﬁne an alarm circle around a stored
waypoint. The alarm circle can help you avoid reefs, rocks, or
restricted waters. You can add a maximum of 10 waypoints or
on-screen map items to proximity alarms with a maximum alarm
radius of 99.99 nautical or statute miles or kilometers.
If a proximity alarm circle overlaps with an existing alarm circle,
a “Proximity Overlaps Another Proximity Waypoint” message
appears. Because the unit only alerts for one of the overlap points,
use caution when navigating in these areas. If your boat enters an
alarm circle overlap, you are only alerted to the closest proximity
waypoint.

MAIN MENU > POINTS TAB

To add a proximity waypoint:

1. On the Points tab, highlight the Proximity sub tab.
2. Press ADJ/MENU, and select New Waypoint. The Find
screen appears. Highlight Waypoints, and press ENTER.
3. To select a waypoint from the list, use the ROCKER to
highlight a waypoint from the User or Nearest tab.
4. Press ENTER to conﬁrm. The Distance ﬁeld is now
highlighted.
5. Press ENTER and use the ROCKER to enter a proximity
radius (to 99.99 units).
6. Press ENTER, when ﬁnished.

To turn proximity alarms on or off:

1. Use the ROCKER to highlight the ﬁeld below Proximity
Alarm, and press ENTER.
2. Select ON or OFF, and press ENTER.

To show the waypoint menu options:

Using the ROCKER, highlight the Proximity tab, and press
ADJ/MENU.

To clear one or all proximity waypoints from the list:

1. Use the ROCKER to highlight the proximity waypoint, and
press ADJ/MENU.
2. To clear a single alarm, highlight Delete, and press ENTER.
3. To clear all proximity waypoints, select Delete All, and
press ENTER.
4. Use the ROCKER to highlight OK, and press ENTER.

The following options are available from the Proximity sub tab:
• New Waypoint—creates a waypoint and adds it to the
proximity list.
• Delete—removes a selected waypoint from proximity list.
• Delete All—removes all waypoints from proximity list.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ROUTES TAB

Route Tab

The Route tab shows all the routes currently stored in memory,
along with a descriptive name for each route. After you create a
route, you can start using it for navigation with the NAV key. You
follow the route in the same sequence as it was originally created,
or you can invert the route and navigate from the end waypoint
back to the beginning waypoint. From the Route list menu, you can
choose New Route (page 17), Copy, Delete, or Delete All.

To copy or delete a route:

1. From the Route List, highlight the route you want to copy or
delete using the ROCKER, and press ADJ/MENU.
2. Choose either Copy or Delete, and press ENTER. With OK
highlighted, press ENTER again to conﬁrm a deletion. The
copied route uses the same route name with an additional
number, starting at 1, at the end of the route name.

To delete all routes:

1. From the Route List, press ADJ/MENU.
2. Highlight Delete All, and press ENTER. With OK
highlighted, press ENTER again to delete all routes.

If you highlight a route
name from the Route
List and press NAV,
the name automatically
appears.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ROUTES TAB

Route Review Page

After you create a route, use the Route Review Page to review and
modify the route shown.
To show the Route Review Page:

1. Press and hold ADJ/MENU, and then highlight the Route tab.
2. Highlight the route you want to review, and press ENTER.
You are now on the Route Edit Map Page.

The Route Review Page also allows you to enter your own 15character name for any listed route. By default, the name includes
the ﬁrst and last waypoints in the route.
To enter a custom route name:

Route List Menu

1. From the Route Review Page, highlight the route you want
to change, and press ENTER.
2. Press ADJ/MENU, and use the ROCKER to select Edit
Route Name. Press ENTER.
3. Use the ROCKER to enter a name, and press ENTER when
ﬁnished.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ROUTES TAB

On the Route Review Page, you can review the route points
(waypoints or map items) one at a time from the list.
To review individual route points:

1. Highlight a route, and press ENTER.
2. Press ADJ/MENU, highlight Use List, and press ENTER.
3. Highlight the waypoint you want to review, and press
ENTER. On the waypoint review window, you can choose
Delete, Next (highlight the next point on the route list),
Show Map (show the point on a map window), or Move
Wpt (permanently delete the waypoint from the unit), and
press ENTER.

When you return to the route point list, the next point in the route is
automatically highlighted. Press ENTER repeatedly to review each
point on the route.

Route Review Options Menu

Route Review Menu Options

Menu options available from the Route Review Page are Use Map,
Add Before, Remove, and Plan.
Use Map—allows you to review and modify the route shown for
each point (waypoint or map item) on a map page. Use the map
pointer to insert a new route point on a route leg, or review the
waypoint, or map item.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ROUTES TAB

To add a point to an existing route:

1. From the Route Review Page, press ADJ/MENU, highlight
Use Map, and press ENTER.
2. Use the ROCKER to move the map pointer labeled “ADD”
to the next point in the you want in the route.
3. Press ENTER.

To edit a route point:

1. From the Route Review Page, press ADJ/MENU, highlight
Use Map, and press ENTER.
2. Use the ROCKER to highlight a route waypoint, and press
ENTER. Use the ROCKER to edit the waypoint properties.
A menu of editing choices appear, with options for
removing, moving (user waypoints only), or adding turns to
the beginning or end of the route.

To remove a route waypoint:

1. From the Route Review Page, press ADJ/MENU, highlight
Use Map, and press ENTER.
2. Use the map pointer to highlight the waypoint you want to
remove, and press ADJ/MENU.
3. Highlight Remove, and press ENTER.

To move a route waypoint:

Highlight a point, and press ENTER to review it.

1. From the Route Review Page, press ADJ/MENU, highlight
Use Map, and press ENTER.
2. Use the map pointer to highlight the waypoint to move, and
press ADJ/MENU.
3. Highlight Move, and press ENTER.
4. Move the map pointer to the new map location, and press
ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ROUTES TAB

To add turns at the beginning or end of the route:

1. Select the ﬁrst (to add waypoints to the beginning of the
route) or last (to add waypoints to the end of the route)
route waypoint with the map pointer, and press ADJ/MENU.
2. Highlight the Add option, and press ENTER.
3. Move the map pointer to the new point or location, and
press ENTER.
4. Repeat step 3 to insert additional waypoints, or press QUIT
to ﬁnish.

Route edit mode also allows you to insert a new route waypoint in
any route leg using the map pointer.
To insert a new waypoint between two existing route
waypoints:

1. Use the ROCKER to select the leg you want to insert the
new waypoint in, and press ENTER.
2. Move the map pointer to the new map location, existing
waypoint, or map item (ADD is shown below the arrow and
the route lines move with the arrow), and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

Add Before—inserts a waypoint into the list of route points or add
a point(s) onto the end of the route.
To insert a point into the route, or add a point to
the end of the route:

1. From either the Route Review or Active Route Pages, use
the ROCKER to highlight the point you want to insert the
new point before (to add a point to the end, highlight the
blank ﬁeld at the bottom of the list), and press ADJ/MENU.
2. Highlight Add Before, and press ENTER.
3. From the Find menu, highlight Waypoints, and press
ENTER. (You can also choose from other points, such as
Cities or Tide Stations from this list.) From either the User
or Nearest From Current Location tab lists, choose the
waypoint you want, and press ENTER twice. (See page 48
for searching for waypoints by name.)

MAIN MENU > ROUTES TAB

To plan your route:
Drag the route
leg to an existing
waypoint (shown),
map item, or a
blank spot on the
map to create a
new route point.

1. From the Route Review Page, press ADJ/MENU, highlight
Plan, and press ENTER.
2. Use the ROCKER to enter planning data in the Speed,
Depart Time, Fuel Flow, and Depart Date ﬁelds.

Remove—removes a point (waypoint or map item) from a route.
This option is available from both the Route Review and Active
Route Pages.
To remove a point from a route:

1. From either the Route Review or Active Route Pages, use
the ROCKER to highlight the point to remove, and press
ADJ/MENU.
2. Highlight Remove, and press ENTER.

Plan—the Route Review and Active Route Pages also show tripplanning information for each leg or the entire route. Available
information includes Course, ETA, Fuel (to point), Leg Distance,
Leg Fuel, Leg Time, Sunrise and Sunset (at point location), and
Time To (point).
56

Trip Planning Data Fields

NOTE: Fuel ﬂow rates on your unit are measured in units per
hour. System setting changes for units of measure (statute,
nautical, or metric) do not affect the fuel ﬂow measure. You
should enter fuel ﬂow rates based on available information for
your vehicle’s (operator’s manual performance speciﬁcations)
and note of the units of measure (gallons, liters.)

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TRACK TAB

Track Tab

Use the Track tab to specify whether or not to record a track log,
deﬁne how it is recorded, or save track log data for future use. The
Track Logs Page also provides an indicator of the memory used for
the active track log and allows you to clear the track memory. See
page 14 for TracBack information. The Track tab is divided in two
sub tabs: Active and Saved.

Active Sub Tab

Saved Sub Tab

The Saved sub tab shows and manages a list of all saved track logs,
allows for TracBack activation, and Map Page of saved logs. The
active log stores up to approximately 10,000 track log points, based
on the criteria speciﬁed in the Track settings. You can save up to 15
track logs in memory, with up to 750 track log points in each saved
log. A TracBack can be started from any of the saved tracks on this
tab.

The Active sub tab is for the active log (the log currently being
recorded). It shows track memory used and current settings. Refer
to page 58.

Active Track Tab

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > TRACK TAB

For the Active tab, the following settings are available:
• Record Mode—contains three track recording options:
• Off—no track log is recorded. If you select Off, you
cannot use the TracBack feature.
• Fill—a track log is recorded until the track memory is
full.
• Wrap—a track log is continuously recorded, wrapping
through the available memory (replacing the oldest track
data with new data).
• Interval—deﬁnes the frequency at which the track plots are
recorded. Three interval settings are available:
• Distance—records track based on a user-deﬁned distance
between points.
• Time—records track plot based on a user-deﬁned time
interval.
• Resolution—records track plot based on a user-deﬁned
variance from your course over ground. The resolution
option is the default setting and is recommended for the
most efﬁcient use of memory and TracBack performance.
The distance value (entered in the value ﬁeld) is the
maximum error allowed from the true course before
recording a track point.
58

• Value—deﬁnes the distance or time used to record the track
log.
• Save—saves the current active track log.
• Clear—erases the active track log stored in memory.
For the Saved tab, the following menu options are available:
• Delete Track—deletes highlighted saved track log from
memory.
• Delete All—deletes all saved track logs from memory.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > DSC AND CARD TAB

DSC Tab

DSC uses marine VHF radio and GPS technologies to transmit
and receive location information. DSC is used by mariners for two
major operation: distress calls and position reporting.
See page 21 and the “Appendix” for more information on DSC and
using it with your GPSMAP 392/398/492/498.

Card Tab

The Card tab contains options for saving waypoints, routes and
tracks to a data card. When data is saved to a data card, it can be
exchanged with other compatible units and Garmin’s MapSource
software program on your PC.
To transfer data on your PC to or from a data card:

1. Insert the data card. From the Card tab, select the check
box next to each type of item you want to transfer.
2. Highlight Save To Card, and press ENTER to save the
selected items to the data card.
3. If transferring data from the card to the unit, highlight Merge
From Card, and press ENTER to combine the selected
items with existing GPS data. Highlight Replace From
Card, and press ENTER to overwrite all selected items on
your GPS.
4. A Transfer Complete message appears after the data is
transferred. Press QUIT.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > MSGS TAB

Msgs Tab

The Message tab on the Main Menu shows a list of messages
generated by your GPSMAP 392/398/492/498. Use the ROCKER
to scroll through the entire list of messages on the Log tab.
To view the messages:

1. Press and hold ADJ/MENU twice to open the Main Menu.
2. Highlight Message from the vertical list of tabs.

To delete all messages:

1. Press and hold ADJ/MENU twice to open the Main Menu.
2. Highlight Message from the vertical list of tabs.
3. Highlight a message, and press ADJ/MENU. Delete All
appears.
4. Press ENTER. Select OK, and press ENTER again to
conﬁrm.

3. Use the ROCKER to highlight a message. Press ENTER to
view detailed information about that message.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > PAGES AND MAP TABS

Pages Tab

The Pages tab allows you to turn main pages on or off and
customize the order.
To turn a main page on or off:

1. Use the ROCKER to highlight the page name ﬁeld. Press
ENTER to show a list of pages available.
2. Select None. The page is now turned off.

Map Tab

The Map tab changes the display properties of the Map Page.
The following pages contain descriptions of the Map tab’s six sub
tabs.

Prefs Sub Tab

To customize the main pages order:

1. Use the ROCKER to highlight a page name ﬁeld.
2. Press ENTER to show the main page list for the numbered
spot.
3. Highlight a page name, and press ENTER.

The Reset Pages button returns the unit to the default page
sequence.

GPSMAP 392/398/492/498 Owner’s Manual

• Map Outlines—On/Off: turns the coverage boxes for
BlueChart/MapSource data on or off.
• Symbol Set—NOAA, International: controls the navaid
symbol set.
• Light Sectors—Off, Auto, On: controls the drawing light
sectors on the map.
• Spot Soundings—On,Warn Depth, Off: turns on the depth
spot sounding data.
• Warn Depth—shows the spot sounding below the set value
in red. This ﬁeld is only available when Warn Depth is
selected in the Spot Soundings ﬁeld.
61

MAIN MENU > MAP TAB

• Orientation—North up: ﬁxes the top of the Map Page to
a north heading. Track up: ﬁxes the top of the Map Page to
the current track heading. Course up: ﬁxes the map so the
direction of navigation is always up.

Nav Sub Tab

Detail Sub Tab

• Chart—Most, More, Normal, Less, Least: controls how
much map detail is shown. This setting only applies to map
features set to Auto. Features that have a speciﬁed zoom
range or are turned off are unaffected by this setting.
• Waypoints, Active Route, Tide Stations, Services, Saved
Tracks, Track Log, and Lat/Lon Grid—Auto, Off, 120
ft-800 mi: sets the maximum zoom range the feature should
appear on the Map Page. Some types of data only show up to
speciﬁc zoom ranges.

Labels Sub Tab

The Labels sub tab contains the screen size of the name or symbol
of the listed feature. You can choose from None, Small, Medium,
and Large.

• AutoZoom—On, Off: when on, the map automatically
adjusts the map zoom range to a lower range as you
approach you destination point.
• Accuracy Circle—On, Off: toggles the circle on or off. The
circle represents the approximate accuracy of the unit based
on EPE, DOP, and basemap quality. Your location is within
the circle.
• Bearing Line—On, Off: toggles the black/white line that
points to the current navigation point.
• Course Line—Auto, Off, 120 ft-800 mi: sets the maximum
zoom range at which the course line appears on the screen.
• Heading Line—On, Off: draws an extension from the end of
the boat icon in the direction of travel.

AIS Sub Tab

Refer to page 25 for more information on AIS.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > MAP TAB

Source Sub Tab

• Basemap—On, Off: turns the built-in base map on or off.
• Advanced—On, Off: turns all optional BlueChart/
MapSource data loaded on the data card on or off. The
Advanced option box shows a list of the optional BlueChart/
MapSource data loaded on the data card. Each area is
described by name and can be hidden if you do not want to
show the data on the Map Page.

GPSMAP 392/398/492/498 Owner’s Manual

To show the Advanced Map Card Setup:

1. Highlight the Advanced option box, and press ENTER.
2. Use the ROCKER to scroll through the list of map family.
Press ENTER to view all of the maps within a map family.
3. To select or hide a map, highlight the check box to the left of
the name of a map. Press ENTER to select or hide the map.
The map is selected and appears on the Map Page when a
check mark appears in the box adjacent to the map.
4. To show detailed information and notes for each area,
highlight a name, and press ENTER. To view the notes for
that area, choose Show Notes. To scroll through the notes,
highlight the notes, press ENTER, and use the ROCKER
to scroll up, down, left, and right, or press ADJ/MENU and
choose a scroll option.
NOTE: The Advanced Map information is only available
when you have a data card with additional map data, such as
BlueChart g2, installed in the unit.

MAIN MENU > HIWAY, TEMP, AND SONAR TAB

Hiway (Highway) Tab

The Hiway tab contains screen settings for the 3D Highway Page.
Refer to the “Highway Page” section on page 33.

Temp (Temperature) Tab

Sonar Tab

The Sonar tab contains setup options for the Sonar Page. The Sonar
Page is not active if you do not have a transducer connected. Refer
to the “Using Sonar” section on page 72 for more information on
sonar setup options.

The Temp tab shows the water temperature log. The temperature
log requires input from a temperature transducer/sensor or from a
connected NMEA device that provides temperature data. The most
recent temperature measured shows on the far right side of the
chart with the history trailing to the left. The dotted lines within the
chart indicate intervals in the temperature scale and the duration of
time.
The following settings are available:
• Log and Graph Scale—controls the temperature range for
the log. Select Auto to have the unit automatically determine
the best range, or select a span of 2, 4, 6, 8, or 10 degrees.
• Log Duration—controls the number of temperature readings
shown on the log. Shorter time durations shows a greater the
number of log points. Use longer time durations to detect
temperature trends, instead of immediate readings.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > SYSTM (SYSTEM) TAB

Systm (System) Tab

The System tab controls system setting for beeper, speed ﬁlter,
languages, system mode, and simulator controls, restores factory
settings, shows software version, and prepares software update
cards.

• System Mode—sets Normal or Simulator Mode. The Setup
button allows you to simulate navigation.
• Set Position*—sets your location while in Simulator Mode.
See page 3 for additional instructions.
• Track Control*—Auto Track, User Track: controls your
heading in Simulator Mode.
• Track*—sets your heading in Simulator Mode.
• Speed*—sets your speed in Simulator Mode.
• Transducer*—sets a transducer type.
* These ﬁelds are only available when the unit is in Simulator Mode.

The following options are also available from the Systm tab:

The following settings are available:
• Beeper—Off, Alarms Only, Key and Alarm: controls audible
beeps.
• Speed Filter—Off, Auto, On: averages speed readings.
• Language—sets the language for the unit’s on-screen text.
• Automatic Backlight—adjusts the backlight based on the
built in sunrise and sunset information.
GPSMAP 392/398/492/498 Owner’s Manual

• System Information—shows the unit’s software, basemap
version, and electronic serial number.
• Prepare SW Update Card—prepares a data card to accept
software updates from your computer through the data card
programmer.
Press ADJ/MENU for the following options:
• Factory Defaults—restores all settings to Garmin’s original
setup values for the entire unit.

MAIN MENU > SYSTM (SYSTEM) TAB

Units Sub Tab

The Unit tab deﬁnes the Position Format, Map Datum, Heading,
Distance, Speed, Elevation, Depth, Temperature, and Pressure
units.

The following settings are available:
• Position Format—changes the coordinate system. Only
change the position format if you are using a map or chart
that speciﬁes a different position format or want to use a
format you are familiar with.

For additional information on Loran TD setup, see page 103.
NOTE: The Units tab settings affects how navigation
information appears on the GPSMAP 392/398/492/498. When
in doubt, seek assistance. If you are using a map or chart in
conjunction with your GPS, make sure the settings under the
Units tab of the GPSMAP 392/398/492/498 match that of the
map or chart. This information should appear somewhere on
the map or chart. If the information is not present, contact the
map or chart maker to determine what position format, datum,
heading and units of measure are being used for the map or
chart.

• Map Datum—sets the datum reference used to determine
a given location. The default setting is WGS 84. The
unit automatically chooses the best datum depending on
your chosen position format. Datums are used to describe
geographic locations for surveying, mapping, and navigation.
You should only change the datum if you are using a map or
chart that speciﬁes a different datum.
WARNING: Selecting the wrong map datum can result in
substantial position errors. Unless otherwise speciﬁed by
the navigation documentation you are using, use the default
WGS 84 datum for best overall performance.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > SYSTM (SYSTEM) TAB

• Distance, Speed and Elevation—sets the units of measure
for distance, speed, and elevation readouts in Nautical (nm,
kt, ft), Nautical (nm, kt, m), Statute (mi, mh, ft), or Metric
(km, kh, m) terms.
• Heading—sets the reference used in calculating heading
information. You can select from Auto Mag Var, True,
Grid, and User Mag Var. Auto Mag Var provides magnetic
north heading references that are automatically determined
from your current location. True provides headings based
on a true north reference. Grid provides headings based on a
grid north reference (and is used in conjunction with the grid
position formats described on page 70). User Mag Var allows
you to specify the magnetic variation at your current location
and provides magnetic north heading references based on the
variation you enter.

To enter a user-deﬁned magnetic variation:

1. With the Heading ﬁeld set to User Mag Var, highlight the
heading reference ﬁeld (immediately to the right), and press
ENTER.
2. Enter the magnetic variation at your current location and
press ENTER.
WARNING: If User Mag Var is selected, you must
periodically update the magnetic variation as your location
changes. Using this setting, the unit does not automatically
calculate and update the magnetic variation at your present
location. Failure to update this setting can result in substantial
differences between the information shown on your unit and
external references, such as a magnetic compass.

Manually enter a
magnetic variation.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > UNITS TAB

• Depth—allows you to select the units of measure for depth
in Feet (ft), Fathoms (fa) or Meters (m).
• Temperature—allows you to select the units of measure for
temperature in Fahrenheit (°F) or Celsius (°C).
• Pressure—allows you to select units of measure for
pressure in Inches Mercury (in), Millibars (mb), and
Hectopascals (hPa).

Time Sub Tab

The Time tab shows the current time and date, allows you to adjust
the 12 or 24 hour time format, enter a time zone, and adjust for
daylight saving time.
The following options are available:
• Time Format—choose from 12 Hour, 24 Hour (military), or
UTC time format.
• Time Zone—choose your correct time zone to show correct
local time or select Other.
• Daylight Saving Time—choose from Auto, On, or Off to
adjust for daylight saving time.

Comm (Communications) Sub Tab

The Comm tab controls the input/output format used when
connecting your GPSMAP 392/398/492/498 to external NMEA
devices, a PC, or another Garmin unit.
• Garmin Data Transfer—the proprietary format used to
upload or download MapSource data, exchange waypoint,
route, track, almanac, and proximity data with a PC or
another Garmin unit. When you select Garmin Data Transfer,
you can choose from 11 Transfer Modes: Host, Request
Almanac, Request Proximity, Request Routes, Request
Tracks, Request Waypoints, Send Almanac, Send Proximity,
Send Routes, Send Tracks, and Send Waypoints.
• Garmin Remote Sonar—required for use with the GSD 22,
GSD 21, or GSD 20.
• NMEA In/NMEA Out—supports the input/output of
standard NMEA 0183 data, and sonar NMEA input support
for the DPT, MTW and VHW sentences.
• None—provides no interfacing capabilities.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > UNITS TAB

To select a transfer mode:

1. Use the ROCKER to select Garmin Data Transfer in the
Serial Data Format ﬁeld.
2. Highlight the Transfer Mode ﬁeld, and press ENTER.
3. Use the ROCKER to select a setting, and press ENTER.

Advanced NMEA settings to adjust the NMEA output are available
if you have one of the ports set to NMEA In/NMEA Out. Advanced
NMEA settings enable/disable certain sentences and adjust the
number of Lat/Lon output precision digits.
When transferring data between two Garmin units,
always set one to Host and use the other unit to either
Send or Request the data.

To select an input/output format:

1. Highlight the Serial ﬁeld, and press ENTER.
2. Use the ROCKER to select a setting, and press ENTER.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ALARM TAB

To adjust the NMEA output:

1. From the Comm tab, highlight NMEA Setup, and press
ENTER.
2. Highlight an option, and press ENTER.
3. Use the ROCKER to select a setting, and press ENTER.
Press QUIT to return to the Comm tab.

Advanced NMEA Output
Setup Page

Alarm Tab

The Alarm tab allows you to deﬁne the alarm settings. The Alarm
tab is divided into three sub tabs: System alarms, Nav alarms, and
Sonar alarms.

System Sub Tab

• Clock—provides an alarm for the system clock. Enter a
time in the time ﬁeld, and turn the alarm on and off from
the control ﬁeld menu. Remember to enter alarm times in
the same time format (UTC or local) you are using for your
system. The unit must be on for the clock alarm to work.
• Battery—sets an alarm to sound when the power reaches a
user-determined voltage.
• GPS Accuracy—the accuracy alarm sounds when the GPS
position accuracy falls outside the user-set value.

Nav Sub Tab

• Anchor Drag—sets an alarm to sound when you have
exceeded a speciﬁed drift distance. Enter a value in the
distance ﬁeld, and use the control ﬁeld to turn the alarm on
and off.

GPSMAP 392/398/492/498 Owner’s Manual

MAIN MENU > ALARM TAB

• Arrival—sets an alarm to sound when at speciﬁed distance
or time away from a destination waypoint. Enter a distance
radius or time for sounding the alarm and use the control
ﬁeld to set the alarm to Off, Dist (Distance), or Time.
• Off Course—sets an alarm to sound when you are off course
by a speciﬁc distance. Enter a distance in the distance ﬁeld
and use the control ﬁeld to turn the off course alarm on and
off.

To set an alarm:

1.
2.
3.
4.

Press and hold MENU to open the Main Menu.
Use the ROCKER to highlight the Alarm tab and a sub tab.
Highlight the ﬁeld you want to start, and press ENTER.
Use the ROCKER and ENTER keys to select and set the
alarm you want.

Sonar Sub Tab

You must be receiving sonar data for these functions to work. See
“Using Sonar” on page 72 for more information.
• Shallow Water/Deep Water—sets an alarm to sound when
you enter an area of speciﬁed depth that is too shallow or too
deep. Enter a depth in the distance ﬁelds and use the control
ﬁelds to turn the alarms on and off.
• Water Temperature—sets an alarm to sound when the
transducer reports a temperature either above, below, inside,
or outside the speciﬁed values.
• Fish—sets alarm to sound when unit detects a ﬁsh of the
speciﬁed symbol.

GPSMAP 392/398/492/498 Owner’s Manual

Press QUIT to acknowledge an alarm.

USING SONAR > SONAR PAGE

USING SONAR
This section covers the additional sonar options for the
GPSMAP 398/498 when used with a transducer and the
GPSMAP 392/492 when used with a GSD 22, GSD 21, GSD 20
and tranducer. Read the Installation Instructions to properly install
the GSD 22, GSD 21, or GSD 20 and transducer.
NOTE: You MUST have a transducer installed and connected
to your GPSMAP 398/498 to use the sonar features.
NOTE: You MUST have a GSD 22, GSD 21, or GSD 20 and a
transducer installed and connected to your GPSMAP 392/492 to
use the sonar features. Ultrascroll is not available with the GSD 20.

Understanding Sonar

The transducer mounted on your vessel sends sound waves
down into the water in a cone shape, similar to a ﬂashlight beam
(covering a smaller circular area at the top and angling out to a
larger circular area at the bottom). These sound waves reﬂect off
of any object that they hit, and then the waves travel back up to the
transducer. These objects could be ﬁsh, branches, the bottom, or
any other object that has a density that is different from the water.
The transducer receives the sound wave information and then sends
the information to the GSD 22, GSD 21, GSD 20 sounder module
72

and then to the GPSMAP 392/398/492/498. The
GPSMAP 392/398/492/498 displays the information on the screen
for you to see and interpret. The type of transducer and the settings
that you choose determine how the information is displayed on the
screen.

Using Dual Frequency

Dual frequency works best for deep water (off-shore) applications.
The 200 kHz frequency allows you access to great detail about
what is underneath your boat. The 50 kHz frequency provides
less detailed information, but penetrates to greater depths with
the same power. You can choose either or both frequencies to get
the information that you want. If you choose dual frequency, the
transducer alternates between the 50 kHz and 200 kHz signals. This
capability allows you to see the best picture available at any depth.

Using Dual Beam

Dual beam works best for shallow water (for example, inland)
applications. A dual beam transducer can transmit a narrow or a
wide beam. The water area covered by the transmitted sound waves
is determined by the beam width of the transducer and the water
depth. The narrow beam provides crisp detail of what is under your
boat, and is very helpful if you are ﬁshing in deeper water where
the beam covers more area (for example, at a 30-foot depth, the
narrow beam covers the area of about a 7-foot circle).
GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR PAGE

Understanding the Sonar Display

One of the ﬁrst things to understand about sonar is that the
transducer sends a beam down to the bottom of the water, much
like the beam of a ﬂashlight. The beam starts small near your vessel
and expands as it gets to the bottom.
The Sonar Page does not show a 3-D representation of the
underwater environment. Instead, the display is in two dimensions,
much like if you took a picture of an aquarium. Only the depth of
the item in the water is shown.
Narrow Beam

Wide Beam

The wide beam is more helpful in shallow water, because it gives
you a much wider view of objects in the water, including areas
beyond the sides of your boat. At a 30-foot depth, the wide beam
covers the area of approximately a 20-foot circle.

The strongest sonar returns appear on your screen as the most
intense solid color (depending on your selected color scheme; red
is the default). The weakest returns appear as the less intense, less
solid colors (blue is the default).
The bottom of the water is always be the strongest signal, and
therefore the most intense color. The bottom is the continuous,
intensely-colored line running across the bottom of the screen.
The GPSMAP 392/398/492/498 uses the latest technology in
interpreting bottom signals; it can see through ﬁsh, structures,
and thermoclines (shown in the weakest colors). However, large
schools of ﬁsh or dense structures close to the bottom can affect
water depth return readings.
NOTE: If the GPSMAP 392/398/492/498 is unable to track the
bottom for any reason, the digits in the depth window ﬂash on
and off to alert you that the unit is not tracking the bottom.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR PAGE

At the top of the screen, you might see a grouping of intense colors.
This area is surface clutter, which can be caused by waves or any
other sonar interference at the surface of the water. Too much
surface clutter can obscure your view of ﬁsh. You can turn down
the Gain setting to reduce this surface clutter.
Between the bottom and the surface clutter, the ﬁsh appear as
arches. Actual ﬁsh returns might not always appear as perfect
arches, due to the speed, ﬁsh orientation, or other conditions. You
can turn on the Fish Symbols setting if you want to see on-screen
ﬁsh in a ﬁsh shape.

Use the Fish Symbols option to view the actual sonar data, ﬁsh
symbols, or a combination of both. Fish symbols appear as red.
You can set the sonar display to show a split screen view of a
zoomed portion of the sonar, split frequencies, bottom lock (display
scaled from the bottom up) or a combination of these options. For
example, you can choose to show dual frequency at a 2X zoom
(Dual 2X) on one half and normal range dual frequency (Dual)
returns on the other half. The display mode appears at the bottom
of each sonar display.

Sonar Page
The Sonar Page is where your GPSMAP 392/398/492/498 becomes
a powerful ﬁshﬁnder/ﬂasher. To view the Sonar Page, press PAGE
repeatedly until it shows. Fish are shown as colored arches or as
ﬁsh icons. Thermoclines are shown as shades of blue. The sonar
function window contains a right-to-left moving sonar image of
the water beneath your boat. Items appear as they pass under the
transducer. The most recent data is shown on the right side of the
screen. The right side of the screen contains a scale reﬂecting the
depth of the area being shown. The top-left corner shows the depth,
water temperature, and speed through water (if equipped with a
temperature or speed sensor).
74

Adjustment
menu

Sonar Page

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR PAGE

Using the Sonar Adjustment Menu

The Sonar Adjustment menu gives you direct access to the settings
and features most commonly used on the Sonar Page. The option
selected currently appears in the upper-left corner of the screen.

2. Press up or down on the ROCKER to select the option, and
press ENTER to access the adjustment window.
3. To exit any of the adjustment options, press QUIT.

To change a Sonar Adjustment menu setting:

1. Select an adjustment option to change using one of the
two methods described previously. The adjustment window
automatically times out and disappears when the unit is idle
for 20 seconds.
2. Press the ROCKER up or down to place the map pointer
or setting bar at the setting, range, or percentage
(Off, 1-100%).
3. Press ENTER or QUIT to exit the adjustment window,
or press left or right on the ROCKER to view another
adjustment window.
Press ADJ/MENU to see a list of all
options and their current settings.

To select an adjustment option from the Sonar Page:

1. Press the ROCKER left or right to scroll through the options
in the upper-left corner of the screen.
2. Press ENTER to access the option’s adjustment window.
OR
1. Press ADJ/MENU. A list of all options and their current
settings appears, with the selected option highlighted.
GPSMAP 392/398/492/498 Owner’s Manual

Range—sets the screen depth range used for viewing. The unit can
be set to automatically track the bottom or set to a user-speciﬁed
depth range. Auto mode shows the most information possible while
continuously showing the bottom.
Gain—controls the sensitivity of the sonar receiver. Auto (default)
is the recommended setting. It automatically sets the sonar
sensitivity. You can also set the gain manually. To see more detail
on the screen, increase the receiver sensitivity by selecting a higher
gain. If there is too much detail or if the screen is cluttered, lower
the sensitivity (lower the gain) to increase the clarity of the screen.
75

USING SONAR > SONAR PAGE

If Frequency is set to Dual, you can set the Gain separately for
each frequency (50 kHz and 200 kHz).
Color Gain—ccontrols what colors are applied to the objects
on the screen. Auto (default) is the recommended setting. It
automatically sets the colors, based on your Auto Color Gain
setting. You can also set the Color Gain manually. If Frequency
is set to Dual, you can set the Color Gain separately for each
frequency (50 kHz and 200 kHz).
Whiteline—controls how the unit shows information about the
bottom type (hard or soft). With the Whiteline Off, the bottom
return shows as red and contains no information on bottom
hardness. With Whiteline set at Normal or 1-100%, the bottom
return becomes white with a red line, in the default color scheme,
indicating where the water meets the bottom. To turn the Whiteline
Off, press the ROCKER down until the setting bar is all the way at
the bottom of the range and reads Off.

UltraScroll/Scroll—adjusts the rate at which the Sonar Pages
scroll from right to left. Ultrascroll™ (default) is used when you
select a scroll rate from 90% to 100%. Auto automatically adjusts
the scroll rate according to the boat’s speed.
Depth Line—adds a horizontal depth line across the screen that is
used to measure the depth of underwater objects. The depth of the
line appears on the right side of the line. Press up or down on the
ROCKER to control the position of the line on the Sonar Page. To
turn the Depth Line off, press the ROCKER up until the setting
bar is all the way at the top of the range and reads Off.

Frequency—only appears when using a dual frequency transducer.
This allows you to choose a sonar operation frequency. You can
choose 200 kHz, 50 kHz or Dual frequency (to alternate between
the two frequencies).

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR TAB OPTIONS

Zoom—sets a screen zoom scale. The following settings are
available:

Tools—controls the display of useful sonar tools. The following
options are available:

Off—turns off the Zoom function.
2x Zoom––displays the 2x zoomed picture.
4x Zoom––displays the 4x zoomed picture.
Btm (Bottom) Lock––displays returns from the bottom up.
When using this setting, “BL” appears at the bottom of the
screen.
Zoom View—available when you select a Zoom scale other than
Off. You can use the Zoom View setting to change the viewing
range of a zoomed display. Auto follows the water bottom. If the
display is set to Bottom Lock, the Span setting adjusts how far off
the bottom the unit shows data.

• A-scope—when you turn on A-scope, a vertical ﬂasher
bar appears on the far-right side of the screen. This ﬂasher
displays structure and bottom returns much the same as the
Flasher Page. The horizontal width of the A-scope signal
indicates the strength of the signal.
• Color Bar—shows a gradient scale of the current Color
Gain setting.
• Temperature Graph—appears only if you have a
temperature-capable transducer. When on, this setting
displays a temperature graph on the bottom of a Sonar Page
that matches the scrolling data.
Split When Zoomed—turns this option on or off. If you turn on
Zoom, then this setting splits the screen.

•
•
•
•

Swap Split—available on a split Sonar Page when you are using
dual frequency. This switches on which side the frequencies appear.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR TAB OPTIONS

Show/Hide Pointer—allows you to reference sonar items and
mark underwater waypoints. This makes it easier to ﬁnd and use
an object such as a stump for a future ﬁshing location. When using
this feature, the Sonar Page pauses. The map pointer does not move
off the paused screen and cannot show an area that has scrolled off
the screen. The depth is updated while the screen is paused, but
the unit does not show any new sonar data until the standard Sonar
Page is resumed. You can see a discontinuity from where the sonar
information stops to where it starts again.

Data window

Map pointer

To mark an underwater waypoint:

1. From the Sonar Page, press ADJ/MENU, highlight Show
Pointer, and press ENTER to pause the screen movement.
2. Use the ROCKER to move the cursor onto the target, such
as underwater drop-offs and stumps, you want to mark. The
data window at the top of the screen shows the cursor’s
depth, coordinates, bearing and distance from your current
position.
3. Press ENTER/MARK. The New Waypoint Page appears
with the waypoint’s coordinates, default three-digit name,
and map pointer depth automatically ﬁlled in.
4. To change the name, symbol, water temp, or depth,
highlight the appropriate ﬁeld and press ENTER. Make your
changes and press ENTER when ﬁnished.
5. When ﬁnished, highlight OK, and press ENTER.
6. To return to the standard Sonar Page, press QUIT; or press
ADJ/MENU, highlight Hide Pointer, and press ENTER.

Show Map Pointer Option

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > SONAR TAB OPTIONS

Sonar Tab Options

When a GSD 22, GSD 21, or GSD 20 is connected to the
GPSMAP 392/398/492/498, the Sonar tab appears on the
Main Menu.

General Sub Tab

Use the General sub tab to select the keel offset, auto color gain,
automatic gain level, automatic scroll speed limit, and transducer
type. The available General sub tab options are as follows:
Keel Offset—used to offset the surface reading for the depth of
a keel. This makes it possible to measure depth from the bottom
of your keel instead of from the transducer’s location. Enter a
positive number to offset for a keel, or enter a negative number to
compensate for a large vessel that can draw several feet of water.
The Keel Offset reﬂects in the depth reading.

Show Numbers Option

Keel Offset:
Transducer at
Surface Enter (+)
a positive number
to show depth from
bottom of keel.

To access and change a setting on the Sonar tab:

1. Press and hold ADJ/MENU to access the Main Menu. Use
the ROCKER to highlight the Sonar tab.
2. Using the ROCKER, highlight the sub tab and then the ﬁeld,
and press ENTER.
3. Highlight the setting, and press ENTER.
4. Press QUIT to return to the Sonar Page or a previous page.
GPSMAP 392/398/492/498 Owner’s Manual

Keel Offset: Transducer
at Bottom of Keel. Enter
a (-) negative number to
show depth from surface.

USING SONAR > UNDERSTANDING SONAR

Automatic Scroll Speed Limit—automatically adjusts the Scroll
rate (see page 76) with the speed of your vessel. Entering your
maximum cruising speed produces a 100% scroll rate when you
reach that speed. One half of that speed produces a 50% scroll rate,
and so on. The default is 30.0 kt.
Transducer Type—allows you to specify what type of transducer
you are using, either Dual Beam or Dual Frequency..

Auto Color Gain—controls what colors are applied to the objects
on the screen. Color DCG is based on depth and makes it easier to
spot subtle changes in bottom conditions or ﬁsh sizes. DynaColor
(default) represents the latest in sonar data presentation and is
recommended for all applications. The presentation is based on
bottom strength. It makes the bottom and the ﬁsh easier to see and
requires fewer adjustments.

Calibrate Water Speed—this appears only if you are using a
speed-capable transducer/sensor. Calibration is required to ensure
that the Water Speed shown on your unit is accurate. The unit
automatically uses GPS ground speed for comparison on the
calibration. If a GPS ground speed is not available, use either your
boat’s speedometer reading (not always accurate) or a stopwatch
to determine your speed over a certain distance (distance / time =
speed). It is recommended that the calibration take place in water
having little or no current.

Automatic Gain Level—controls the aggressiveness of the Auto
Gain. The higher the setting, the greater the number of targets
appear on the screen. The lower the setting, the less clutter on the
screen. The settings are Low, Medium (default), and High.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > UNDERSTANDING SONAR

To calibrate the water speed:

1. Use the ROCKER to highlight Calibrate Water Speed, and
press ENTER.
2. Bring the boat to a cruising speed. Both the top GPS ground
speed and uncalibrated water speed appear at the bottom
of the calibration window. Note your top speed, stop the
boat, and press ENTER.
3. By default, the top speed automatically appears in the What
was your top water speed? ﬁeld. If a ground speed is not
available, the top uncalibrated water speed is used instead.
If the new speed is correct, highlight OK, and press ENTER.
If you want to manually enter a calibration, press ENTER on
the speed ﬁeld, enter a new speed, and press ENTER.
NOTE: If the boat is not moving fast enough or the speed
sensor is not registering a speed, a “Boat Is Not Moving Fast
Enough To Calibrate” message appears at the bottom of the
screen. Check that the speed sensor wheel is moving or safely
increase boat speed. If there is a problem with the speed sensor,
or if a speed senor is not installed, a “Water Speed Sensor Is
Not Working” message appears at the bottom of the screen.
Check the connections of the speed sensor cables.

Graph Sub Tab

The available Graph sub tab options are:
• Fish Symbols—sets how the Sonar Page interprets
suspended targets and background information. If you select
a ﬁsh symbol, the GPSMAP 392/398/492/498 identiﬁes
some returns for you by replacing them with ﬁsh symbols
(in large, medium, and small sizes based on the size of the
sonar return). If you are using dual beam, ﬁsh symbols from
the narrow beam (directly underneath your boat) are solid,
and the returns from the wide beam (out to the sides of your
boat) are hollow.
The Sonar Page does not interpret the sonar return data.
Suspended targets appear as symbols. No background
information appears
Same as previous with the target depth shown.
Suspended targets appear as symbols. Background
information appears, making the distinction between
ﬁsh and structure easier.
Same as previous with target depth shown.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > UNDERSTANDING SONAR

• Scale—controls the appearance of the depth scale shown
vertically along the right side of the graph. You can conﬁgure
the depth scale to appear in one of four different ways: as an
Overlay, in the Corners, Basic, or No Scale.
• Water Temperature Number and Water Speed Number—
hides or shows temperature and water speed on the Sonar
Page. When set to Auto, the unit automatically shows this
information, only if it is received from the transducer.
• Color Scheme—sets the colors for the Sonar and Flasher
Pages.
NOTE: If the unit is unable to track the bottom for any reason,
the digits in the depth window ﬂash on and off to alert you that
the unit is not tracking the bottom.

Transducer Coverage

The area covered by the transmitted sound waves is determined
by the cone angle of the transducer and the water depth. The wide
cone angles (40°) associated with low frequencies (50 kHz/80kHz)
provide a large coverage area for ﬁnding ﬁsh within a coverage
width that is approximately 2/3 of the water depth. However, this
also means that wide cone angles produce less bottom detail and
resolution. As shown in the drawing on page 73, the 40° cone angle
produces a coverage area of approximately a 20-foot diameter
circle at a 30-foot depth.
The narrow cone angles (10°) associated with the high frequencies
(200 kHz) provide better bottom resolution and crisper detail, but
cannot show a large coverage area for ﬁnding ﬁsh. The 10° cone
angle provides a coverage width that is approximately 2/10 of the
water depth. As shown in the drawing on the far right, the 10° cone
angle produces a coverage area of approximately a 6-foot diameter
circle at a 30-foot depth.
Dual frequency or dual beam modes combine both frequencies to
get the best coverage area and contour/depth readings.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > UNDERSTANDING SONAR

Whiteline

When the sonar sound waves are reﬂected back by the bottom,
a hard bottom returns a stronger signal than a soft bottom. A
thin whiteline indicates a softer bottom, while a thick whiteline
indicates a harder bottom. Normally, a red line is used to show the
point where water meets the bottom. This line follows the bottom
contour, along with any signiﬁcant objects lying on the bottom.
The unit uses the whiteline function to make the bottom layer
information easier to distinguish. These images show the Classic
Black color scheme.

Thermoclines

A rough deﬁnition of a thermocline is a break in water where
the water temperature changes faster than the water above it.
Thermoclines are shown as the weakest colors.
One of the unique features offered by Garmin is See-Thru®
technology, which allows the GPSMAP 392/398/492/498 to hear
both weak and strong signals simultaneously so as to identify
ﬁsh returns under the toughest conditions, such as suspended in
thermoclines or even hiding near structures. See-Thru technology
allows the transducer to see through thermoclines and locate ﬁsh.
This image is in the Classic Black color scheme

Thick whiteline:
Hard bottom

Whiteline On

GPSMAP 392/398/492/498 Owner’s Manual

Whiteline Off

Thermocline

USING SONAR > FLASHER PAGE

Flasher Page

The Flasher page provides an almost instantaneous return of what
is below your boat. This page can show depth, ﬁsh, bottom content,
and structure. When you use the Flasher page, you can adjust
the Range, Gain, Color Gain, Frequency, and Scroll settings. See
page 79 for information about these settings and how to change
them.

Flasher Page

Understanding the Flasher Page
The most intense, constant signal on the Flasher Page is the actual
depth and bottom:
• A soft bottom (such as silt or mud) creates a signal that is
narrow and more faint.
• A hard bottom (such as sand or rock) creates a signal that is
wider.
The colors indicate the different strengths of the signals. If you
understand a bit about how sonar works, you can better understand
what you see on the Flasher Page. Remember, three-dimensional
space is appearing on a two-dimensional screen. The circular area
of the bottom becomes a wide mark on the screen and ﬁsh inside
the transducer beam can be any color and in any position, including
inside and beyond the bottom mark. The colors indicate the
different strengths of the signals. This can be roughly correlated to
a position inside the beam. Red being the center most part, orange
the area around, and green the outer edge of the beam. Targets (for
example, ﬁsh) with larger surface area appear more red; and targets
with less surface area appear orange, and green for the smallest
items.

GPSMAP 392/398/492/498 Owner’s Manual

USING SONAR > MAP SPLIT PAGE

The ﬁsh mark itself holds a lot of information. You can tell if
ﬁsh are bigger or smaller, because the thickness of the red mark
correlates to the thickness of the ﬁsh.

Map Split Page

The Map Split Page is horizontally divided into two main areas, the
Map and the Sonar. This page only appears if the unit is receiving
sonar information. Refer to page 27 for information on the Map
and page 74 for the Sonar information.

Flasher Page Without
Data Fields
Map Split Page

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > SPECIFICATIONS

Speciﬁcations

APPENDIX

Physical Speciﬁcations

Size: (Internal Antenna) 6.2" H x 6.30" W x 3.14" D
(15.7 cm x 16.0 cm x 8.0 cm)
(External Antenna) 6.2" H x 6.30" W x 3.26" D
(15.7 cm x 16.0 cm x 8.3 cm)
Weight: Less than 2.0 lb
Display: 5.0" diagonal (12.7 cm) 256-color TFT display with
backlighting (234 x 320 pixels)
Case: Fully gasketed, high-impact plastic alloy, waterproof to
IEC 529-IPX-7
Temp. Range: 5°F to 158°F (-15°C to 70°C)

Performance

Receiver: Differential-ready 12 parallel channel WAAS-capable
receiver
Acquisition Times:
Warm: Approx. 15 seconds
Cold: Approx. 45 seconds
AutoLocate: Approx. 2 minutes

WAAS Accuracy:
Position: <3 meters (10 feet), 95% typical*
Velocity: 0.05 meters/sec steady state
Dynamics: 6gs
* Subject to accuracy degradation to 100 m 2DRMS under the U.S. DOD-imposed Selective
Availability Program.

Power

Source: 10-33 V DC
Usage: 14 watts max. at 13.8 vDC
Fuse: AGC/3 AG-3 Amp

Sonar

Sounder Power: 500 watts (RMS)
4,000 watts (peak to peak)
Dual Frequency: 50/200 kHz (40°/10°) frequency
1,500 foot max depth*
Dual Beam: 80/200 kHz (40°/14°) frequency
900 foot max depth*
* Depth capacity is dependent on water salinity, bottom type, and other water conditions.

Update Rate: 1/second, continuous
GPS Accuracy:
Position: <15 meters (49 feet), 95% typical*
Velocity: 0.05 meters/sec steady state
86

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > INSTALLING THE GPSMAP 492/498 EXTERNAL GPS ANTENNA

Installing the GPSMAP 492/498 External
GPS Antenna

The GPSMAP 492/498 with external antenna must be properly
installed according to the following instructions to get the
best possible performance. To complete the external antenna
installation, you need the appropriate fasteners and a 1" x 14-thread
marine antenna mount available at most marine dealers.
The GPSMAP 492/498 with internal antennas do not require this
installation. To acquire satellites, install the unit with a clear view
of the sky.

Mounting the GPS Antenna
(External Antenna Units Only)

The antenna should be mounted in a location that has a clear,
unobstructed view of the sky in all directions to ensure the best
reception. Avoid mounting the antenna where it is shaded by the
boat’s superstructure, a radome antenna, or mast. Sailboat users
should avoid mounting the antenna high on the mast to prevent
inaccurate speed readings caused by excessive heeling. Most
marine VHF and LORAN antennas should not seriously degrade
the GPS antenna’s reception. Never paint the antenna or clean it
with harsh solvents.

GPSMAP 392/398/492/498 Owner’s Manual

Suggested locations for mounting the external antenna.

The Garmin antenna screws directly onto any standard 1" x 14thread antenna mount. If you need to raise the antenna to avoid
shading, try using a 1" x 14-thread extension mast available at most
marine dealers.
NOTE: It is possible to route
the coaxial cable either through,
or outside the antenna mount. It
is possible to remove the BNC
connector on the coaxial cable
and the coaxial cable shortened
to ease installation, however,
doing so voids the antenna
warranty. If the BNC connector
is removed, it must be replaced
with a new solder-on or crimp
BNC connector.
87

APPENDIX > MOUNTING THE GPSMAP 392/398/492/498

To install the GPS antenna:

1. Screw the antenna directly onto the 1" x 14-thread mount.
2. Route the cable to the mounting location of the unit. Use the
appropriate tie-wraps, fasteners, and sealant to secure the
cable along the route and through any bulkhead or deck.
3. After the GPSMAP 492/498 unit is installed, connect the
cable to the antenna connector on the back of the unit.
Make sure that you turn the antenna cable connector 1/4
turn clockwise to lock the cable into place.

Mounting the GPSMAP 392/398/492/498
Using the Swivel Bracket Mount

The GPSMAP 392/398/492/498’s compact, waterproof case is
suitable for mounting in exposed locations or at the nav station.
The unit comes with a single-knob tilt & swivel bracket that can be
used for surface or overhead mounting.

When choosing a location for the display unit, make sure you
consider the following conditions:
• There should be at least a 3" (7 cm) clearance behind the
case to allow connection of the antenna (external antenna
only), power/data cables.
• The mounting surface should be heavy enough to support the
unit and protect it from excessive vibration and shock.
• For GPSMAP 392/398/492/498 unit’s with the built-in
internal antenna, should be mounted in a location that
provides a clear, unobstructed view of the sky in all
directions to ensure the best reception. Avoid mounting the
unit where it is blocked by the boat’s superstructure, a radar
arch, or mast.
NOTE: The temperature range for the GPSMAP
392/398/492/498 is 5°F to 158°F (-15°C to 70°C). Extended
exposure to temperatures exceeding this range (in storage or
operating conditions) can cause failure of the screen. This type
of failure and related consequences are NOT covered by the
manufacturer’s limited warranty.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > MOUNTING THE GPSMAP 392/398/492/498

To install the GPSMAP 392/398/492/498 swivel base:

1. Using the swivel base as a template, mark the location of
the three holes that are used to secure the bracket to the
mounting surface.
2. If securing the base with machine bolts, drill three 5/32”
(5 mm) holes at the locations you marked.
OR
If you are securing the base with self-tapping screws, drill
starter holes at the locations you marked. Starter holes
should generally be no deeper than half the screw length.
3. Secure the swivel base with three bolts or screws.
DO NOT OVERTIGHTEN.
4. Place the rest of the mount over the swivel base and secure
with the short knob.

Tools (not included)—Drill, Screwdriver (Phillips or Standard),
three #8 (4 mm) pan head machine bolts with matching nuts
and washers and a 5/32” (5 mm) drill bit, OR three #8 pan head
self-tapping screws and an appropriately-sized drill bit for drilling
starter holes. Always wear safety goggles, ear protection, and a dust
mask when drilling, cutting or sanding.

The swivel base is designed to be secured
using a pan head screw or machine bolt. If
you use a screw with a countersunk head,
you risk damaging the Mounting Base.

GPSMAP 392/398/492/498 Owner’s Manual

Flush Mounting the GPSMAP 492/498
(External Antenna only)

The GPSMAP 492/498 with external antenna can be ﬂush mounted
on a ﬂat panel. When ﬂush mounting the GPSMAP 492/498, be
sure to choose an appropriately sized location for the unit (see unit
dimensions on page 86) and leave 1.25" (32 mm) clearance below
the data card slot for inserting or removing data cards. A Flush
Mount Template is provided in the package. Use the instructions on
the template to complete the ﬂush mount installation.
89

APPENDIX > INSTALLING THE TRANSDUCER

Installing the Transducer

The transducer acts as the eyes and ears of your new sonar. Proper
transducer installation is critical to the operation of your unit. The
transducer transmits sound waves toward the bottom in a cone
shape. The larger the cone angle, the larger the coverage area at a
given depth.

Wide cone angle

A 50/200 kHz dual frequency 40°/10° cone angle, temperature
sensing, transom mount transducer is included in the GPSMAP 498
(with transducer) package. This transducer provides good allaround performance.

Narrow cone angle

Dead zone
fish not seen

X
X

A wide cone angle transducer works best in shallow water. The
wide cone angle provides a large coverage area, but at a decreased
bottom resolution. In deeper water this can result in a large dead
zone where ﬁsh cannot be seen. A narrow cone angle transducer
is better suited to deep-water installations. The narrow cone angle
provides a smaller viewing area (compared to a wide cone angle
transducer at the same depth) with improved bottom resolution and
a smaller dead zone. Dual frequency transducers give you the best
of both wide and narrow cone angles.

A 80/200 kHz dual beam 40°/14° cone angle, temperature sensing,
transom mount transducer is included in the GPSMAP 398 (with
transducer) package. This transducer provides good all-around
performance.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > INSTALLING THE TRANSDUCER

Transom Mount Transducer

The following diagram is for mounting the transducer included with the GPSMAP 392/398/492/498 with transducer package. If the
transducer lead is too short, extension cables are available from your Garmin dealer. DO NOT cut the transducer lead or any part of the
transducer cable, as this will void your warranty. The cable cannot be spliced and connected to any existing (Garmin or non-Garmin)
transducer cables.
NOTE: DO NOT mount the transducer behind strakes, struts, ﬁttings, water intake, or discharge ports, or anything that creates air bubbles or
causes the water to become turbulent. It is important that the transducer is in clean (non-turbulent) water for optimal performance.

Mount the transducer cable cover
well above the waterline.

Apply marine sealant to all screw threads to
prevent water from seeping into the transom.

��

Mount the transducer parallel with the water surface.

GPSMAP 392/398/492/498 Owner’s Manual

Make sure that the transducer is below the water
level when the boat is on plane at high speed.
Transducer should extend 1/8" below the
ﬁberglass hull or 3/8" below aluminum hull.
Do not mount the transducer directly in the path of the prop.
The transducer can cause cavitation that my degrade the boat’s
performance and damage the prop.

APPENDIX > CONNECTING THE POWER/DATA CABLE

Connecting the Power/Data Cable

The power/data cable connects the GPSMAP 392/398/492/498
to a DC supply and provides interface capabilities for connecting
external devices. The color code in the diagram below indicates
the appropriate harness connections. Replacement fuse is a
AGC/3AG - 3 Amp fuse.

NOTE: CANet wiring diagrams are provided with the CANet
accessory.

NOTE: During a typical installation, only the Red and Black
wires are used. The other wires do not have to be connected for
normal operation of the unit.
Orange (Accessory On)

(CANet L)
(CANet H)

DC Positive

(RX NMEA)

(TX NMEA)

�������� Accessory On

DC Power
Source

CANet L

CANet H

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > INTERFACING

Interfacing

You can download a copy of Garmin’s proprietary communication
protocol on the Help and Support section of our Web site at
www.garmin.com.

The following are the sentences for NMEA 0183, vs. 3.01 output:

Complete information regarding NMEA format is available for
purchase at www.nmea.org

The following formats are supported for connection of external
devices:
Approved sentences—GPRMC, GPRMB, GPGGA, GPGSA,
GPGSV, GPGLL, GPBOD, GPBWC, GPVTG, GPRTE, GPXTE,
GPWPL, SDDBT, SDDPT, SDMTW, SDVHW, and GPAPB.
Proprietary sentences—PGRME, PGRMM, and PGRMZ. The
GPSMAP 392/398/492/498 accepts NMEA input with support for
the DBT, DPT, MTW, VHW, and WPL sentences.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > INSTALLING AND REMOVING DATA CARDS

Installing and Removing Data Cards

The GPSMAP 392/398/492/498 uses optional Garmin marine
BlueChart g2 and MapSource data cards to show digital charts and
maps on-screen. Data cards are installed in the card slot located at
the bottom right of the unit. Data cards can be installed or removed
at any time, whether the unit is on or off.

To remove a data card:

1. Open the card door by pressing together on the two handles
at the bottom of the door and lifting it up and open.
2. Grasp the card handle at the bottom and pull down ﬁrmly.
3. If the unit is on, a conﬁrmation tone sounds when the data
card has been removed.

To install a data card:

1. Open the card door by pressing together on the two handles
at the bottom of the door and lifting it up and open.
2. Insert the card, with the label facing front and the handle
bottom, into the slot.
3. Firmly push the card into the unit. It in not necessary to
force the card and about 1/2" is still exposed when it is
properly inserted. If the unit is on, a conﬁrmation tone
sounds and a message shows on-screen noting the card
details when the card is properly installed and accepted.
4. Close the cover.

If you insert a data card and get a “card format not recognized”
message, try removing the card and reinserting it. If the card is still
not recognized, contact Garmin Support or your Garmin dealer
for assistance. Data cards are not waterproof and should not be
exposed to moisture or excessive static charges. Data cards should
be stored in the case supplied with the card.
94

The ﬁrst time you insert a data card, the unit takes a few seconds to
read the card.
After the data card is read, a summary screen appears. Press
ENTER to acknowledge.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > SATELLITE INFORMATION

Satellite Information

Satellite Strength Indicator Bars
90°

Center dot - 90°
above the horizon

Inner ring- 45°
above the horizon
Outer ring the horizon
45°

Satellite Sky View

Satellite Location

The location of each available satellite shows over two location
rings on the Satellite Information Page. The outer ring represents
the horizon, the inner ring represents 45° above the horizon, and
the center represents directly overhead. When the unit is using a
satellite for navigation, the satellite number is highlighted on the
location rings. The unit can be set to show satellite location with
North or your current track at the top of the screen.

GPSMAP 392/398/492/498 Owner’s Manual

The Satellite Strength Indicator Bars show the strength of the
signal being received, and the status of the signal. The bars are
either shaded or ﬁlled. The gray bar means the GPS is in the
process of storing orbital data it is receiving from the satellite
signal. When the bar turns solid, the GPS is using the satellite
signal for navigation. A “D” in or above the bar means that
differential corrections (WAAS) is being applied to that satellite.

Date, Time, and Current Location

The GPS gets date and time information from the satellite’s
on-board atomic clock. When the GPS receiver has achieved a
GPS location, the current location appears in the selected location
format.

APPENDIX > WHAT IS WAAS/EGNOS?

What is WAAS/EGNOS?

The Wide Area Augmentation System (WAAS) is an FAA funded

All SBAS systems use the same receiver frequency; therefore any
operational SBAS system should be capable of providing your GPS
unit with increased accuracy at any location in the world.

The system is made up of satellites and approximately 25 ground
reference stations positioned across the United States that monitor
GPS satellite data. Two master stations, located on either coast,
collect data from the reference stations and create a GPS data
correction message.

Currently, enabling WAAS on your GPSMAP 392/398/492/498 in
regions that are not supported by ground stations, may not improve
accuracy, even when receiving signals from an SBAS satellite. In
fact it can degrade the accuracy to less than that provided by GPS
satellites alone. For this reason, when you enable WAAS on your
Garmin GPS receiver, the receiver automatically uses the method
that achieves the best accuracy.

service to improve the overall integrity of the GPS signal for users
in North America. In Europe, WAAS is referred to as EGNOS.

According to the FAA’s Web site, testing of WAAS in September
2002 conﬁrmed an accuracy performance of 1-2 meters horizontal
and 2-3 meters vertical throughout the majority of the continental
United States and portions of Alaska.

For more information, go to http://gps.faa.gov.

WAAS is just one service provider that adheres to the MOPS
(Minimum Operational Performance Standard) for global Satellite
Based Augmentation Systems (SBAS). Eventually there will
be several services of worldwide geostationary communication
satellites that broadcast integrity information and differential
correction data as transmitted by ground reference stations.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > WHAT IS MMSI?

What is a Maritime Mobile Service Identity
(MMSI)?
Maritime Mobile Service Identity (MMSI) allows a VHF radio to
act like a phone. In order to make a “call” on a phone, you ﬁrst
need a phone number to dial. The 9-digit MMSI number acts like
a phone number when used in a position report and as a unique
identiﬁer to the Coast Guard when used in an emergency Distress
Call. In order to obtain a MMSI number, users must register their
VHF radio with the FCC (Form 605). Garmin does not supply this
number.

How ARE MMSI assignments obtained?

Non-commercial users (for example, recreational users who remain
in domestic waters and only carry VHF, EPIRB (Emergency
Position Indicating Radio Beacons), and Radar) are not required to
have a FCC ship station license. The FCC and Coast Guard have
authorized some second and third party vendors to assign MMSI
numbers. This service is limited to registering recreational vessels
only. To receive information on how to obtain a recreational MMSI
number, contact: www.uscg.mil/rescue21/links/mmsi.htm or
http://wireless.fcc.gov/marine/.

GPSMAP 392/398/492/498 Owner’s Manual

USNon-Federal User: Commercial users, or those who travel
outside the U.S. or Canada, must apply for a ship station license, or
an amendment to a ship station license. To ﬁnd out if you require
a Ship Station license contact: http://wireless.fcc.gov/marine/
fctsht14.html. If your vessel requires licensing by the FCC you
obtain a MMSI during the application/licensing process when you
ﬁle FCC Forms 159 and 605.
US Federal User: Federal users can obtain MMSI assignments
from their agency radio spectrum management ofﬁce. These
procedures are currently under review by the NTIA (National
Telecommunications and Information Administration).
Outside the US: Users can obtain an MMSI assignment from their
telecommunications authority or ship registry, often by obtaining or
amending their ship station license.
In Canada: Industry Canada is responsible for assigning MMSI
numbers to commercial and recreational vessels. Information is
available at the following web site: http://apollo.ic.gc.ca/english/
mmsi.html.
For information regarding MMSIs visit:
www.navcen.uscg.gov/marcomms/gmdss/mmsi.htm.

APPENDIX > NAVIGATION TERMS

Navigation Terms

Avg Speed—the average of all second-by-second speed readings
since the last reset.
Bearing (BRG)—the compass direction from your current location
to a destination.

ETA at Destination—the time you estimate to reach a Go To
destination or the ﬁnal waypoint in a route.
ETA at Next—the time you estimate to reach a destination or the
next waypoint in a route.

Course—the course between the active from and to waypoints.

Fuel—the fuel required to travel from current location to the
indicated route waypoint.

Depth—the depth below the transducer. This ﬁeld is active only if
a transducer is connected to the GPSMAP 392/398/492/498.

GPS Accuracy—estimated accuracy of the GPS location.
Leg Dist—the distance between two route waypoints.

Distance (Dist)—the distance from the current location to a
destination.

Leg Fuel—the fuel required to travel from a route waypoint to the
next waypoint (in sequence) in the route.

Dist to Destination—the distance from the current location to a Go
To destination or the ﬁnal waypoint in a route.

Leg Time—the time required to travel from a route waypoint to the
next waypoint (in sequence) in the route.

Dist to Next—the distance from current location to a Go To
destination or the next waypoint in a route.

Max Speed—the maximum second-by-second speed recorded
since last reset.

DOP (Dilution of Precision)—reﬂects the quality of the GPS
signals and satellite geometry.

Moving Average Speed—average speed while the unit is moving.

Elevation—height above mean sea level (MSL).
ETA (Estimate Time of Arrival)—the time you estimate to reach
your destination waypoint, based on current speed and track.
98

Moving Trip Timer—total time the unit has been moving.
Odometer—a running tally of distance travelled, based on the
distance between second-by-second position readings.
Off Course—the distance you are off course in either direction,
left or right.
GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > NAVIGATION TERMS

Map Pointer—an arrow pointing to your destination.
Speed—the current velocity at which you are travelling, relative to
a ground position. Also referred to as ground speed.
Sunrise—the time at which the sun rises.

Total Average Speed—average speed of unit for both moving and
stopped speeds since last timer reset.
Total Trip Timer—total time the unit has been in operation since
last reset of the trip timers.

Time Of Day—the current time.

Turn—the angle difference between the bearing to your destination
and your current track. L indicates you should turn left; R indicates
you should turn right.

Time To—the estimated time required to reach a Go To
destination, or the next waypoint in a route. Also known as
“estimated time en route.”

VMG (Velocity Made Good)—the speed you are closing in on a
destination along a course. Also referred to as the vector velocity to
your destination.

Time to Dest—the estimated time required to reach a Go To
destination, or the ﬁnal waypoint in a route.

Voltage—current voltage reading being received by unit.

Sunset—the time at which the sun sets.

Time to Next—the estimated time required to reach a Go To
destination, or the next waypoint in a route.

Water Speed—the speed through the water. This ﬁeld is only
active if the GPSMAP 392/398/492/498 is receiving speed readings
from a transducer or NMEA device.

To Course—the recommended direction to steer to reduce course
error or stay on course. Provides the most efﬁcient heading to get
back to the course and proceed along your route.

Water Temp—the water temperature. This ﬁeld is only active if
the GPSMAP 392/398/492/498 is receiving speed readings from a
transducer or NMEA device.

Track—the direction of movement relative to a ground position.
Also referred to as “ground track.”

Waypoint Destination—the ﬁnal waypoint in the route, or the
destination waypoint.

Trip Odometer—a running tally of distance travelled since the last
reset. See also “Odometer.”

Waypoint Next—the next waypoint in the route.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > MESSAGES

Messages and Alarms

The GPSMAP 392/398/492/498 uses an on-screen message system
to notify you of events and alert you to problems. Press QUIT to
acknowledge a message or alarm.
Accuracy Alarm—the GPS accuracy has fallen outside of user-set
value.
Alarm Clock—the alarm clock has sounded.
Anchor Drag Alarm—you have drifted out of the speciﬁed
distance range.
Antenna Input is Shorted—some part of the antenna wiring is
contacting the chassis.
Approaching [Waypoint Name]—you are a speciﬁed alarm
distance from a destination waypoint.
Arriving At [Waypoint Name]—you arrived at the destination
waypoint.
Battery Alarm—battery voltage has fallen below the value entered
in the Battery Alarm setup.
Can’t Read User Card—error reading card; remove and reinsert.
Contact your dealer or Garmin Product Support if the problem
persists.
Can’t Read Voltages That High, Limited To Top Of Range—the
voltage value in the Battery Alarm setup is higher than the unit can
read.
100

Can’t Read Voltages That Low, Limited To Bottom Of Range—
voltage value in the Battery Alarm setup is lower than the voltage
where the unit automatically turns off.
Can’t Unlock Maps—data on data card is not unlocked for the
unit. Contact your dealer or Garmin Product Support.
Can’t Write User Card, Data Card May Be Full—error reading
card; remove and reinsert. Contact your dealer or Garmin Product
Support if the problem persists.
Can’t Write User Card, Data Card Is Read-Only—the data card
in your unit contains data copy protection.
Database Error—internal problem with the unit. Contact your
dealer or Garmin Product Support to have the unit serviced.
Deep Water Alarm—the water is deeper than the amount set in the
Deep Water Alarm.
Directory Item With This MMSI Already Exists—the MMSI
number is already in DSC directory. Use a different number.
Directory Memory is Full, Can’t Create Entry—the DSC
directory has reached maximum of 100 contacts. Delete unneeded
contacts to add new ones.
Distress Call—a DSC distress call has been received. Take
appropriate action.
Drift Alarm—the depth has changed by the amount of the Drift
Alarm value.
GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > MESSAGES

Fish Alarm (not a textual alarm, as indicated by a ﬁsh bitmap
ﬂashing in the upper left part of the display)—shows an icon
and a beep sounds (if enabled) when a ﬁsh is detected. This alarm
does not show a message banner.
Invalid MMSI—enter a Valid MMSI.
Lost Satellite Reception—the unit has lost satellite signals. Check
antenna connections or try moving to a location with a clear view
of the sky.
MDB Waypoint Memory is Full, Can’t Create Waypoint—unit
memory is full; no further data can be saved.
Proximity Alarm—you are nearing a proximity waypoint.
NMEA Depth Is Below Transducer—you must enter an
appropriate Keel Offset for the transducer.
No Tide Stations for that Area—no tide stations within 100 miles
of the area.
No Proximity Waypoints/Routes/Tracks/User Waypoints
Found—attempted to transfer user data from a data card that does
not contain the speciﬁed type of data. Make sure there is data to
transfer on data card.
Off Course Alarm—you are off course the distance set in the “Off
Course” alarm.

GPSMAP 392/398/492/498 Owner’s Manual

Proximity Alarm—you entered the alarm radius for the proximity
waypoint indicated.
Proximity Alarm Memory Full—you used all available proximity
waypoints.
Proximity Overlaps Another Proximity Waypoint—the alarm
radius speciﬁed overlaps the area speciﬁed for another proximity
waypoint. Adjust the distance.
Route Already Exists—you entered a route name that already
exists in memory. Modify the route name or delete the previous
route name.
Route Full—you attempted to add more than 300 points to a route.
Reduce the number of points or create a second route.
Route Truncated—uploaded route from another device has more
than 300 waypoints and was truncated to ﬁt.
Route Waypoint Memory Full—no additional route waypoints
can be saved.
Shallow Water Alarm—the Shallow Water Alarm depth has been
reached.
Simulating Operation—the unit is in Simulator Mode. Do not use
for normal navigation.
Sonar Failed, Unit Needs Repair—there is an internal problem
with the unit. Contact your dealer or Garmin Product Support to
have the unit serviced.
101

APPENDIX > MESSAGES

Sonar Service Incompatible—(only applied to the GPSMAP
392/492) the external sonar device you are connected to needs a
software update.
Sonar Service Lost—(only applied to the GPSMAP 392/492)
the external sonar device you were connected to has either been
disconnected or the GPSMAP 392/492 has lost communication
with the sonar device for some other reason.
Track Already Exists [Track Name]—you entered a saved track
name that already exists in memory. Modify the track name or
delete the existing track.
Track Memory Full—no more track data can be stored without
deleting old data.
Track Log Full—the track log is full and track recording has been
turned off. To record more track points, you need to clear the track
log and turn track recording on. This only appears when the track
recording setting is set to “Stop When Full.”
Track Memory is Full, Can’t Create Track—the track log
memory is full. No additional track log data can be stored without
deleting old data to create memory space.

Transducer Disconnected, Sonar Turned Off—there is not a
transducer attached, bad cable/transducer, or the transducer cable
was disconnected. If the transducer cable is removed while the unit
is on, reconnect and cycle power.
Transfer Complete—the unit has ﬁnished uploading or
downloading information to the connected device.
User Card Not Found, Please Insert Card—attempted to transfer
user data without a data card containing user data being present in
the Data Card slot.
Water Temperature Alarm—sonar has reported a temperature
above, below, inside, or outside the speciﬁed value(s).
Waypoint Already Exists—you entered a waypoint name that
already exists in memory. Modify the waypoint name or delete the
existing waypoint.
Waypoint Memory Full—you have used all 4,000 waypoints
available. Delete unwanted waypoints to make space for new
entries.

Track Truncated—a complete uploaded track does not ﬁt into
memory. The oldest track log points were deleted to make space for
the most recent data.

102

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > LORAN TD SYSTEM

LORAN TD System

LORAN-C is a radio navigation aid operated and maintained in the
United States by the United States Coast Guard. The name LORAN
is an acronym for “LOng RAnge Navigation.” The LORAN system
covers the entire United States and the U.S. Coastal Conﬂuence
Zone. From the perspective of a mariner, the system is used for
ocean and coastal navigation. It can be used as a supplemental
system for harbor and harbor approach navigation, and it is used
for inland navigation by recreational vehicles.

LORAN TD Feature

The LORAN TD (Time Delay) feature eases the transition from
using LORAN to using GPS. The GPSMAP unit automatically
converts GPS coordinates to LORAN TDs for those who have a
collection of LORAN ﬁxes for favorite ﬁshing spots and other
waypoints recorded as TDs. You can show your position as a TD
or enter waypoints as TDs. The accuracy to be expected from this
conversion is approximately 30 meters. When the unit is placed
in the LORAN TD format mode, it simulates the operation of
a LORAN receiver. Position coordinates can show as TDs, and
all navigation functions can be used as if the unit was actually
receiving LORAN signals.

Using the LORAN TD Format

Change to Loran TD from the Units
tab on the Main Menu.

GPSMAP 392/398/492/498 Owner’s Manual

When creating new waypoints using LORAN TD coordinates,
you must set the correct LORAN chain number and secondary
stations in the Setup TD ﬁeld before storing the waypoint. After
the waypoint is stored in unit memory, it always references the
LORAN chain number and secondary stations currently selected in
the Setup TD ﬁeld. If you enter a different LORAN chain number
or change the secondary stations or offsets in the Setup TD ﬁeld,
the active waypoint information reﬂects those changes. Since the
GPSMAP 392/398/492/498 does not rely on the LORAN signal for
navigation, it can reference a different GRI chain and/or secondary
stations and still navigate to the location stored in memory.
103

APPENDIX > LORAN TD SYSTEM

The LORAN Position Format ﬁeld is located under the Setup–
Location tab in the Main Menu. The LORAN TD Setup window
contains the ﬁelds to select the Loran GRI-Chain Number, Primary
and Secondary Stations, and TD Offsets.

Loran TD Setup Page

To set up Loran TD from the Main Menu:

1. Press and hold ADJ/MENU to show the Main Menu.
2. Using the ROCKER, highlight the Position Format ﬁeld on
the Units tab, and press ENTER.
3. Highlight Loran TD, and press ENTER.
4. Highlight Setup, and press ENTER.
5. To change the settings of any of the ﬁve ﬁelds, highlight the
ﬁeld, press ENTER, select or enter a setting, then press
ENTER.
6. When ﬁnished, highlight Save, and press ENTER.
104

If the active GRI Chain, secondary stations, or offsets have been
changed since the waypoint was created, the waypoint now
references the active GRI-chain and secondary stations. You must
adjust the TD coordinates accordingly. Remember that the GPS
is not relying on the LORAN signal for navigation and actually
converts the TD coordinate to a useful LAT/LON coordinate before
storing the waypoint to memory or using it for navigation. Because
of this, the unit can navigate to a TD coordinate anywhere in the
world.
You must know your GRI chain number and secondary stations
to create a LORAN TD position. For more information, read our
LORAN TD Position Format Handbook, available at the Garmin
Web site (www.garmin.com/manuals/LoranTDPositionHandbook_
Manual.pdf.)

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > OPTIONAL ACCESSORIES

Optional Accessories

The following optional accessories are designed to enhance the
operation of the GPSMAP 392/398/492/498.
To obtain replacement parts and optional accessories, contact your
Garmin Dealer, Garmin Product Support in the U.S.A. at
800-800-1020, or Garmin Europe at 44-0870-8501241.
WARNING: Garmin accessories have been designed
and speciﬁcally tested for use with Garmin products.
Accessories offered by other manufacturers have not been
tested or approved for use with Garmin products. Use of
such accessories could cause damage to the GPSMAP
392/398/492/498 and void the warranty.

MapSource Software CD-ROMs—enhances the basemap,
create waypoints and routes from your PC. MapSource offers
several detailed mapping options that are compatible with the
GPSMAP 392/398/492/498, including MetroGuide, BlueChart, and
Fishing Hot Spots.
BlueChart g2 Preprogramed Data Cards—enhances the
basemap featuring additional data like highly detailed coastal roads
and points of interest such as restaurants, lodging, local attractions
and more. Full-color aerial photos of ports, marinas, bridges, and
navigational landmarks are also included on many data cards.
GPSMAP 392/398/492/498 Owner’s Manual

Programmable Data Cards—blank data cards are available in 16
MB, 32 MB, 64 MB, 128 MB, and 256 MB sizes. Download streetlevel map detail, points of interest, business addresses and phone
numbers, marine data, topographical information, and more from
MapSource CD-ROMs to a data card, either directly through your
GPSMAP 392/398/492/498 using the PC Interface Cable, or with
the Data Card Programmer.
USB Data Card Programmer—programs blank data cards at high
speed through a PC.
Pre-Programmed Data Cards—data cards pre-programmed with
either Garmin BlueChart or Fishing Hot Spots map data.
A/C Adapter—powers the unit using a standard AC house current.
PC Interface Cable with Vehicle Power Adapter—connects
the GPSMAP 392/398/492/498 to a vehicle’s electrical system
on one end, and a PC, beacon receiver, marine autopilot, or other
compatible device on the other end.
Quick-Release Flush Mount Kit—mounts your Fishﬁnder ﬂush
on the bulkhead or cabin wall. Press the side clips to release the
Fishﬁnder so you can take it with you.
CANet™ Connection Kit—allows you to connect your unit to
another CANet-compatible Garmin unit, so you can read sonar
displays on chartplotters located elsewhere in the boat.
105

APPENDIX > SOFTWARE LICENSE AGREEMENT AND PRODUCT REGISTRATION

Software License Agreement

BY USING THE GPSMAP 392/398/492/498, YOU AGREE TO
BE BOUND BY THE TERMS AND CONDITIONS OF THE
FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE
READ THIS AGREEMENT CAREFULLY.
Garmin grants you a limited license to use the software embedded
in this device (the “Software”) in binary executable form in the
normal operation of the product. Title, ownership rights, and
intellectual property rights in and to the Software remain in
Garmin.
You acknowledge that the Software is the property of Garmin and
is protected under the United States of America copyright laws
and international copyright treaties. You further acknowledge
that the structure, organization, and code of the Software are
valuable trade secrets of Garmin and that the Software in source
code form remains a valuable trade secret of Garmin. You agree
not to decompile, disassemble, modify, reverse assemble, reverse
engineer, or reduce to human readable form the Software or any
part thereof or create any derivative works based on the Software.
You agree not to export or re-export the Software to any country
in violation of the export control laws of the United States of
America.
106

Product Registration

Help us better support you by completing our online registration
today! Connect to our Web site at www.garmin.com/registration/.
Use this area to record the serial number (8-digit number located
on the back of the GPSMAP 392/398/492/498) in case your
GPSMAP 392/398/492/498 needs service. Keep the original sales
receipt, or a photocopy, in a safe place.
Serial Number: ___ ___ ___ ___ ___ ___ ___ __

Contact Garmin

Contact Garmin if you have any questions while using your
GPSMAP 392/398/492/498. In the USA contact Garmin Product
Support by phone: 913/397.8200 or 800/800.1020, Monday–Friday,
8 AM–5 PM Central Time; or go to www.garmin.com/support/, and
click Product Support.
In Europe, contact Garmin (Europe) Ltd. at 44/0870.8501241.

GPSMAP 392/398/492/498 Owner’s Manual

APPENDIX > LIMITED WARRANTY

Limited Warranty

This Garmin product is warranted to be free from defects in materials or
workmanship for one year from the date of purchase. Within this period, Garmin
will at its sole option repair or replace any components that fail in normal use.
Such repairs or replacement will be made at no charge to the customer for parts
or labor, provided that the customer shall be responsible for any transportation
cost. This warranty does not cover failures due to abuse, misuse, accident or
unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE
EXCLUSIVE AND RANGE Down LIEU OF ALL OTHER WARRANTIES
EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY
ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS
WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY
FROM STATE TO STATE.
RANGE Down NO EVENT SHALL GARMIN BE LIABLE FOR ANY
INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES,
WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE
THIS PRODUCT OR FROM DEFECTS RANGE Down THE PRODUCT. Some
states do not allow the exclusion of incidental or consequential damages, so the
above limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software or
offer a full refund of the purchase price at its sole discretion. SUCH REMEDY
SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH
OF WARRANTY.
To obtain warranty service, contact your local Garmin authorized dealer or call
Garmin Product Support for shipping instructions and an RMA tracking number.
The unit should be securely packed with the tracking number clearly written on
GPSMAP 392/398/492/498 Owner’s Manual

the outside of the package. The unit should then be sent, freight charges prepaid,
to any Garmin warranty service station. A copy of the original sales receipt is
required as the proof of purchase for warranty repairs.
Garmin International, Inc.
1200 E 151st Street, Olathe, Kansas 66062 USA
Tel. 913/397.8200
Fax. 913/397.8282
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL UK
Tel. 44/0870.8501241
Fax 44/0870.8501251
Online Auction Purchases: Products sold through online auctions are not eligible
for rebates or other special offers from Garmin. Online auction conﬁrmations are
not accepted for warranty veriﬁcation. To obtain warranty service, an original
or copy of the sales receipt from the original retailer is required. Garmin will
not replace missing components from any package purchased through an online
auction.
International Purchases: A separate warranty is provided by international
distributors for units purchased outside the United States. This warranty is
provided by the local in-country distributor and this distributor provides local
service for your unit. Distributor warranties are only valid in the area of intended
distribution. Units purchased in the United States or Canada must be returned to
the Garmin service center in the United Kingdom, the United States, Canada, or
Taiwan for service.
The Garmin GPSMAP 392/398/492/498 has no user-serviceable parts. Should you
ever encounter a problem with your unit, please take it to an authorized Garmin
dealer for repairs.
107

APPENDIX > FCC COMPLIANCE

FCC Compliance

The GPSMAP 392/398/492/498 complies with Part 15 of the
FCC interference limits for Class B digital devices FOR HOME
OR OFFICE USE. These limits are designed to provide more
reasonable protection against harmful interference in a residential
installation, and are more stringent than “outdoor” requirements.
Operation of this device is subject to the following conditions: (1)
This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that
may cause undesired operation.
This equipment generates, uses, and can radiate radio
frequency energy and may cause harmful interference to radio
communications if not installed and used in accordance with the
instructions. However, there is no guarantee that interference will
not occur in a particular installation.
If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the
interference by one of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the
receiver.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
108

• Consult the dealer or an experienced radio/TV technician
for help.
The GPSMAP 392/398/492/498 does not contain any userserviceable parts. Repairs should only be made by an authorized
Garmin service center. Unauthorized repairs or modiﬁcations
could result in permanent damage to the equipment, and void your
warranty and your authority to operate this device under Part 15
regulations.

Industry Canada Compliance

This Category II radiocommunication device complies with Industry Canada
Standard RSS-310.

Conformité à la réglementation de la Industry
Canada

Ce dispositif de radiocommunication de categorie II rencontre la norme CNR310 d’Industry Canada.

Declaration of Conformity (DoC)

Hereby, Garmin, declares that this GPSMAP 392/398/492/498 is
in compliance with the essential requirements and other relevant
provisions of Directive 1999/5/EC.
To view the full Declaration of Conformity, see the Garmin Web
site for your Garmin product: http://www.garmin.com/products/
gpsmap498/. Click Manuals, and then select the Declaration of
Conformity link.
GPSMAP 392/398/492/498 Owner’s Manual

INDEX

INDEX
Symbols

200 kHz frequency 72
2X zoom 77
4X zoom 77
50 kHz frequency 72

a-scope 77
accessories 105
accuracy 37
accuracy circle 62
active route page 36
options 36
additional information 21
advanced map card 63
alarms
anchor drag 70
arrival 71
battery 70
clock 70
DSC 25
ﬁsh 71
off course 71
shallow/deep water 71
temperature 71
alarm tab 70
anchor drag alarm 70

arches 74
arrival alarm 71
automatic scroll speed 80
auto color gain 80

backlight 4
basemap 63
battery alarm 70
bearing line 62
bottom of the water 73
btm (bottom) lock 77

calibrate water speed 80, 81
card tab 59
caution i
celestial tab 45
chart 62
cleaning vi
clock alarm 70
clutter 74
color 73
color bar 77
communication tab 68
compass page 32
conventions i
course line 62
course up 62

GPSMAP 392/398/492/498 Owner’s Manual

data cards 94
data entry 6
date/time 95
daylight saving time 68
delete
DSC directory item 23
depth line 76
dilution of precision 98
distance 58
distress calls 22, 22–24
DOP 98
DSC 21
call list 23
directory 23
log 23
setting up 25
DSC tab 59

edit

waypoint 11
Enter/Mark key 5, 8

FCC compliance 108
ﬁnd 19
Find key 5, 19
ﬁsh alarm 71
ﬁsh symbols 74, 81

ﬂasher page 84
frequency
200 kHz 72
50 kHz 72

gain 75
gain setting 74
garmin data transfer 68
go to 13
distress call 24
position report 24
GPS tab 37
options 39

hard bottom 84
heading line 62
Highway Page, 3D 33
options 35
highway tab 64

initializing 1
installation 87
interface keys 5
interfacing 93
In Zoom key 5

109

INDEX

keel offset 79
keypad usage 5
key beeps 65

language 65
license agreement 106
LORAN TD 103

magnetic variation 67
main menu 37
main pages 26
Man OverBoard 10
MapSource 59
map datum 66
Map Page 27
options 30
setup map 32
map pointer 7, 28
map scales 29
map tab 61
Maritime Mobile Service Identity 97
Mark key 5
measure distance 31
Menu key 5
merge from card 59
messages 100
110

MMSI 22, 97
MOB 10

narrow beam 72
NAV/MOB Key 5, 12
navaids 63
navigating 12
distress call 24
Go To 13
position report 24
routes 18
TracBack 14
navigation terms 98
NMEA 70
north up 62

Power key 5
power on/off 1
proximity waypoints 50

Quit key 5

off course alarm 71
orientation 62
Out Zoom key 5
overzoom 29

receiving a DSC call 24
replace from card 59
review
DSC call 23
waypoints 11
Rocker key 5
routes 17
copy 51
create 17
delete 51
delete all 51
routes tab 51
route review page 52
options 53

pages tab 61
Page key 5
points tab 46
position format 66
position reports 22

satellite location 95
satellite sky view 95
scroll speed 80
selecting options 6
shallow/deep water alarm 71

simulator mode 3
software update card 65
soft bottom 84
sonar 72
depth line 76
understanding 72
whiteline 76
Sonar Page 74
adjustment menu 75
sonar tab 64
options 79
sound waves 72
speciﬁcations 86
speed ﬁlter 65
split when zoomed 77
storage vi
strongest sonar returns 73
surface clutter 74
swap split 77
system information 65
system tab 65

temperature 82
temperature graph 77
temperature scale 64
temperature tab 63
thermoclines 83

GPSMAP 392/398/492/498 Owner’s Manual

INDEX
tide tab 40
time format 68
time tab 68
time zone 68
tools 77
TracBack 14
activate 16
track logs
clear 15
save 15
track tab 57
active 57
saved 57
track up 62
transducer 82, 90
transducer type 80
trip planning 56
trip tab 44

underwater waypoints 78
units tab 66

WAAS 96
disable/enable 39
warning i
waterproof vi
water speed 80, 82
water temperature alarm 71
waypoints
creating 8
creating graphically 9
editing 11
Enter/Mark 8
move 12
proximity 50
reviewing 11
underwater 78
waypoint lists
proximity 49
user 47
weakest returns 73
whiteline 76, 83
wide beam 72
wiring installation 92

zoom 77
Zoom keys 5
zoom settings 29

GPSMAP 392/398/492/498 Owner’s Manual

111

For the latest free software updates (excluding map data) throughout the life of your
Garmin products, visit the Garmin Web site at www.garmin.com.

© Copyright 2006 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, USA
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9DL, UK
Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
www.garmin.com
Part Number 190-00653-00 Rev. C

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