Garmin Sounder 125 Users Manual Man Rev B

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SOUNDER 125 GPS125Sounder_OwnersManual

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GPS 125

Sounder

Marine

Navigator

ZOOM

Owner’s Manual

Reference

125 Man Rev B 7/23/98 11:47 AM Page i

Software Version 2.0 or above

1200 E. 151st Street, Olathe, KS USA 66062

Tel: 913-397-8200 or 800-800-1020

Fax: 913-397-8282

Web Site Address: www.garmin.com

GARMIN (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park, Romsey, SO51 9AQ, U.K.

Tel: 011-44-1794-519944

Fax: 011-44-1794-519222

GARMIN (Taiwan) Corp.

4th Fl., No. 1., Lane 45,

Pao-Hsing Road,

Hsin Tien, Taiwan R.O.C.

Phone: 886.02.917.3773

Fax: 886.02.917.1758

form or by any means, electronic or manual, including photocopying and recording, for

any purpose without the express written permission of GARMIN.

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.

GARMIN, AutoLocate, and TracBack are all trademarks of GARMIN Corporation

and may not be used without the expressed permission of GARMIN.

July 1997 Part #190-00111-00 Rev. B Printed in Taiwan.

125 Man Rev B 7/23/98 11:47 AM Page ii

INTRODUCTION

Overview

GPS 125

SOUNDER

Operator’s

Manual

Welcome to the easiest-to-use combination GPS/Depth Sounder on the

water! The GPS 125 Sounder represents GARMIN’s continuing commitment to

provide mariners with quality navigation and fishfinding information in a versa-

tile, accurate, and user-friendly design which will be useful for years to come. It

is important that you take the time to read through the operator’s manual to

understand the operating features of the GPS 125 Sounder. The manual is orga-

nized into four sections for your convenience:

Introduction gives a quick overview of the manual and contains the table

of contents and glossary of navigation terms.

Getting Started takes you through step-by-step instructions to initialize the

receiver for first-time use and introduces you to the basic features of the unit

with a quick-start orientation to the GPS 125 Sounder. This section has been

designed to acquaint you with the unit and provide a basic working knowledge

necessary to use the unit in typical conditions.

Reference provides detailed explanations of the advanced features and oper-

ations of the GPS 125 Sounder in a topical format. This allows you to concen-

trate on a specific topic quickly, without reading through entire sections of text

that you may not need.

The Appendix section contains installation instructions and items with mul-

tiple listings, such as: map datums, time offsets, and the index.

See your GARMIN dealer for accessories including our PC kit and standard

or temperature reading in-hull and transom-mount transducers.

Thanks for choosing the GARMIN GPS 125 Sounder. We hope it will help

you meet all of your navigation and fishfinding needs.

125 Man Rev B 7/23/98 11:47 AM Page iii

Caution

INTRODUCTION

The GPS system is operated by the government of the United States,

which is solely responsible for its accuracy and maintenance. The system is

subject to changes which could affect the accuracy and performance of all

GPS equipment. Although the GPS 125 Sounder is a precision electronic

NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted

and, therefore, become unsafe.

Use the GPS 125 Sounder at your own risk. To reduce the risk of

unsafe operation, carefully review and understand all aspects of this

Operator’s Manual and thoroughly practice operation using the simulator

mode prior to actual use. When in actual use, carefully compare indications

from the GPS 125 Sounder to all available navigation sources including the

information from other NAVAIDs, visual sightings, maps, etc. For safety,

always resolve any discrepancies before continuing navigation.

NOTE: This device meets requirements for Part 15 of the FCC limits for

Class B digital devices for home or office use. It has been tested for compli-

ance with all necessary FCC standards. This equipment generates, uses, and

can radiate radio frequency energy and, if not installed and used in accor-

dance with the instructions, may cause harmful interference to radio commu-

nications. However, there is no guarantee that interference will not occur in a

particular installation. If this equipment does cause harmful interference to

other equipment, which can be determined by turning the equipment off and

on, the user is encouraged to try and correct the interference by relocating the

equipment or connecting the equipment to a different circuit than the affected

equipment. Consult an authorized dealer or other qualified service technician

for additional help if these remedies do not correct the problem. Operation is

subject to the following conditions: (1) This device cannot cause harmful

interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation. The GPS 125

Sounder does not contain any user-serviceable parts. Repairs should only be

made by an authorized service center. Unauthorized repairs or modifications

could void your warranty and your authority to operate this device under Part

15 regulations.

125 Man Rev B 7/23/98 11:47 AM Page iv

INTRODUCTION

Table of

Contents

SECTION ONE Introduction

Glossary/Navigation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

SECTION TWO Getting Started

Turning On and Initializing the Receiver . . . . . . . . . . . . . . . . . . . . . .5-7

Primary Page Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9

Marking a Waypoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Position Page and Map Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12

Going to A Waypoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Using the Highway Page and Cancelling a GOTO . . . . . . . . . . . . .13-14

Using The Sounder Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-17

Clearing a Map and Turning Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

SECTION THREE Reference

Satellite Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19

Position Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Marking, Saving, and Using Waypoints . . . . . . . . . . . . . . . . . . . . .21-28

TracBack Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29-30

Creating and Using Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-36

Sounder Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-40

Map Plotting, Zooming, and Cursor Movement . . . . . . . . . . . . . . .41-43

Using the Compass and Highway Navigation Pages . . . . . . . . . . . .44-46

Menu Page and Distance/Sun Calculation . . . . . . . . . . . . . . . . . . . . . .47

Track Log Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47-48

Interface Setup and DGPS Interface . . . . . . . . . . . . . . . . . . . . . . . .49-51

System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51-52

Navigation Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53-55

Map Page Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55-56

Alarms Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Sounder Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58-61

Navigation Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62-63

Appendix A––Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64-69

Appendix B—Wiring and Specifications . . . . . . . . . . . . . . . . . . . .70-71

Appendix C—Messages and Time Offsets . . . . . . . . . . . . . . . . . . .72-73

Appendix D—Map Datums . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74-76

Appendix E––Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77-78

125 Man Rev B 7/23/98 11:47 AM Page 1

Glossary

INTRODUCTION

The GPS 125 Sounder is a powerful navigation tool that can guide you any-

where in the world. To better understand its operation and capabilities, it may be

helpful to review the basic terms and concepts briefly explained below.

Other navigation and GPS definitions used in the manual are defined in the

appropriate reference sections of the manual.

Almanac Data

Satellite constellation information (including location and health of satellites) that is

transmitted to your receiver from every GPS satellite. Almanac data must be acquired

before GPS navigation can begin.

Bearing (BRG)

The compass direction from your position to a destination.

Course Made Good (CMG)

The bearing from the “active from” position (your starting point) to your present

position.

Crosstrack Error (XTE)

The distance you are off a desired course in either direction.

Desired Track (DTK)

The compass course between the “from” and “to” waypoints.

Differential GPS (DGPS)

An extension of the GPS system that uses land-based radio beacons to transmit position

corrections to GPS receivers.

Estimated Time of Arrival (ETA)

The time of day of your arrival at a destination.

Estimated Time Enroute (ETE)

The time left to your destination at your present speed.

Ground Speed (SOG)

The velocity you are traveling relative to a ground position.

125 Man Rev B 7/23/98 11:47 AM Page 2

INTRODUCTION

Glossary

Latitude

The north/south measurement of position perpendicular to the earth’s polar axis.

Longitude

An east/west measurement of position in relation to the Prime Meridian, an imagi-

nary circle that passes through the north and south poles.

Position

An exact, unique location based on a geographic coordinate system.

Sensitivity

A measure of how sensitive the sounder is to sonar echoes.

Speed Over Water (SOW)

The speed you are traveling over the surface of the water.

Thermocline

A layer of water separating warmer water above from cooler water below.

Track (TRK)

The direction of movement relative to a ground position.

Universal Transverse Mercator (UTM)

A grid coordinate system that projects global sections onto a flat surface to measure

position in specific zones.

Velocity Made Good (VMG)

The speed you are traveling in the direction of your destination.

Waypoint

A specific location saved in the receiver’s memory.

Whiteline

A term applied to the checkered portion of the sonar display which shows the area

of strongest sonar return (typically the bottom).

125 Man Rev B 7/23/98 11:47 AM Page 3

Navigation

Basics

INTRODUCTION

NORTH

“ACTIVE FROM”

WAYPOINT

NORTH

DTK

CROSSTRACK ERROR

BRG

TRK

GROUND SPEED

DISTANCE

“ACTIVE TO”

WAYPOINT

“ACTIVE LEG”

The GPS 125 Sounder provides steering guidance and

navigation information using degrees, a measurement mea-

sured in a clockwise direction from a north reference. North

is described as 000º, east as 090º, south as 180º, and west as

270º. The diagram and compass rose below provide a graphic

illustration of the navigation terms used by the GPS 125

Sounder. More information on basic navigation and GPS are

available at your local library or bookstore.

125 Man Rev B 7/23/98 11:47 AM Page 4

Getting Started with Your GPS

Welcome to the exciting world of GARMIN GPS!

The GPS 125 Sounder represents GARMIN’s continuing

commitment to provide marine users with quality navi-

gation information in a versatile, user-friendly design

they will enjoy for years to come. To get the most out

of your GPS receiver, be sure to read through the ini-

tialization and Getting Started sections of this manual,

and refer to the reference section for complete details

on the GPS 125 Sounder’s advanced features.

Initializing Your GPS for First-Time Use

The first time you power up your new GPS 125

Sounder is an important step in getting the best possi-

ble future GPS performance.

Because a GPS receiver can only receive signals

from satellites above the horizon, it needs to know

what satellites to look for at any given time. By using

an almanac (a timetable of satellite numbers and their

orbits) stored in the receiver’s memory, the GPS 125

Sounder can determine the distance and position of

any GPS satellite and then use this information to

determine your position.

To obtain this almanac data, your GPS receiver

needs to be initialized or given the opportunity to “find

itself”, the very first time it is turned on. Once you

have initialized the unit, the GPS 125 Sounder will

compute future fixes more rapidly, usually in a few

minutes.

Remember, that initializing the unit is only neces-

sary under the following conditions:

• First-time use from the factory

• If the receiver has been moved over 500 miles

from the last calculated position with power

off

• If the receiver’s memory has been cleared and

all stored data has been lost

Welcome Page

The welcome page will

appear as soon as the GPS

125 Sounder is turned on

and remain on while the

unit conducts a brief

self-test.

GETTING

STARTED

Initialization

125 Man Rev B 7/23/98 11:47 AM Page 5

Initializing the Receiver

The receiver is shipped from the factory in

AutoLocate™ mode, which enables the GPS 125

Sounder to determine its location anywhere in the

world. To speed up the initialization process, we recom-

mend using EZinit described below, which will usually

provide a fix in a few minutes.

Before you initialize, make sure your GPS 125

Sounder unit, antenna, and transducer have been cor-

rectly installed on your boat according to the instruc-

tions in Appendix A.

To turn the GPS 125 Sounder on:

1. Press and hold

until the receiver turns on.

The welcome page will be displayed while the unit

conducts a self test.

Once testing is complete, the welcome page will be

replaced by the status page, with the EZinit prompt

ready for you to select one of two initialization

methods:

•Select Country––allows you to initialize the

receiver by selecting your present position from a

list of countries in the GPS 125 Sounder’s internal

database. This usually provides a position fix in a

few minutes.

•AutoLocate

––allows the GPS 125 Sounder to

initialize itself and calculate a position fix without

knowing your present position. This usually pro-

vides a position fix in 7.5-15 minutes.

If the EZinit prompt has not automatically

appeared on the Satellite Page:

1. Press the

key.

Note: If the EZinit prompt appears at any time after

you have initialized the receiver (because satellite sig-

nals are being obstructed by trees, etc.), highlight ‘No

Re-Init’ with the arrow keypad and press ENTER.

To initialize the receiver:

1. If the ‘country’ option is not highlighted, press the

key repeatedly to move the field highlight to the ‘coun-

try’ option and press the

key.

Initialization

GETTING

STARTED

The EZinit prompt will

automatically appear if the

receiver needs to be initial-

ized. The prompt may also

appear during normal use if

the antenna is shaded.

Use the arrow keypad to

highlight the country,

region, or state of your pre-

sent position from the list

and press ENTER. If the

country is not listed, select

the closest country instead.

125 Man Rev B 7/23/98 11:47 AM Page 6

2. Use the

key to scroll through the list options until

the country of your present position appears.

3. Use

to highlight the country/state/region you’re in.

If the country you’re in is not listed, select another

country within 500 miles of your present position.

4. Press

to finish.

The GPS 125 Sounder will now begin searching for

the appropriate satellites for your location and should

acquire a position within a few minutes. You can verify

that you have acquired a position by watching the

Satellite Page transition to the Position Page (provided

you haven’t pressed any other buttons) or by looking for

a ‘2D NAV’ or ‘3D NAV’ status at the top left corner of

the Satellite Page.

Initialization Troubleshooting

If you have trouble initializing the receiver or

acquiring a position, check the following:

• Does the antenna have a clear view of the sky?

If there are nearby buildings, heavy tree cover, a

covered boat slip, etc., the unit may not be receiving

enough satellite signals to calculate a position.

• Have you selected the right country/state/region

from the EZinit list?

Check for the correct approximate lat/long on the

Position Page or reselect the appropriate country

from the list to restart the initialization.

• Have you moved more than 500 miles from the

last calculated position with the receiver off?

Reinitialize the receiver, selecting the country/state/

region of your new location from the EZinit list.

Your unit should now be initialized. If you want to

complete the Getting Started Tour at another time, you

may now turn the GPS 125 Sounder off (see below) or

you may continue.

To turn the GPS 125 Sounder off:

1. Press and hold

for approximately three seconds

until the receiver turns off.

The GPS 125 Sounder’s

Satellite Page will help you

determine which satellites

are in view and whether or

not any satellites are being

“shaded” or blocked from

the receiver’s antenna.

By monitoring the signal

strength bars at the bottom

of the page and the sky view,

you’ll be able to see how

moving to another area with

a clearer view of the sky will

improve satellite reception

and speed up signal

acquisition.

GETTING

STARTED

Initialization

125 Man Rev B 7/23/98 11:47 AM Page 7

Sounder Page

Primary Pages

The GPS 125 Sounder uses six primary “pages” to

give you information. The pages are arranged in a con-

tinual loop and can be easily viewed in forward or

reverse order by pressing either the Jor

key.

Before we start the tour, let’s briefly look at these pages.

Satellite Page

The Satellite Page shows satellite positions and

signal strength. Satellite positions are shown using a

“birds-eye-view” display. Signal strength bars are shown

for each satellite in use. Satellite status and estimated

position error (EPE) are shown in the upper corners.

Position Page

The Position Page shows you where you are, what

direction you’re heading and how fast you’re going. The

top of the page contains a compass tape which is a

graphic representation of your heading. Your track and

speed are indicated immediately below, with the digital

depth displayed at the bottom of the page.

The graphic compass tape reflects your head-

ing only while you are moving.

The rest of the page shows your current position in

three dimensions: latitude, longitude and altitude. A

trip odometer and 12/24-hour clock are also provided.

Sounder Page

The Sounder Page gives a view of the water

beneath your boat while displaying sonar contacts and

bottom contour.

Primary Pages

GETTING

STARTED

Satellite Page

The Satellite Page will

allow you to monitor

satellite signal reception

and strength.

125 Man Rev B 7/23/98 11:47 AM Page 8

Map Page

The Map Page acts as a window that allows you to

view your position, the “path” you have traveled over,

and nearby waypoints. A diamond icon in the center of

the screen represents your present position. As you

move, you will see a thin line, called a track log, appear

along the path you have just covered. Names of stored

waypoints can also be shown on the map.

The bottom corners of the page will always display

your current track and speed, with the digital depth

shown in the center. If you are navigating to a way-

point, highlighting an on-screen waypoint, or panning

the cursor, the corresponding distance and bearing will

be shown at the top corners.

Navigation Page

A navigation page gives you directional guidance

when going to a waypoint. The GPS 125 Sounder has

two navigation page choices: the Highway Page or the

Compass Page. The Highway Page is the default and

will be briefly explained here. The Compass Page is

covered on pg. 46.

The Highway Page uses a graphic highway to

show your movement in relation to your desired

course. The upper section shows bearing and distance

to the waypoint and your current track and speed. The

middle portion contains the actual highway. The bot-

tom of the page contains the estimated time enroute

(ETE) and your velocity made good (VMG).

Menu Page

The last primary page is the Menu Page. The

Menu Page gives you access to the GPS 125 Sounder’s

waypoint management, route, track log, and setup fea-

tures through a list of submenus.

Screen Backlighting

The GPS 125 Sounder features three levels of back-

lighting. Activate the backlight by pressing the POWER

key briefly. Each press of the button advances the back-

lighting to the next level and then turns it off.

Backlighting will remain on until turned off.

Map Page

The Map Page shows your

progress on a moving map

plotter and gives a bird’s-

eye-view of surrounding

waypoints.

GETTING

STARTED

Primary Pages

& Backlighting

Highway Page

With the Highway Page,

you will get graphic steer-

ing guidance in navigating

a route or to a single way-

point.

125 Man Rev B 7/23/98 11:47 AM Page 9

Getting Started Tour

Now that your GPS receiver has been initialized and

you are familiar with the primary pages, it’s time to take

a tour. This is a live tour and is to be conducted with

your unit installed and with the boat in the water. The

tour will take you through the receiver’s basic features

and functions as you move about on the water and

assumes that the GPS 125 Sounder is turned on, initial-

ized, and that you have not changed any of the factory

settings (units of measure, selectable fields, etc.). If

these settings have been changed, the pictures and

descriptions in this manual may not match what you

see on your screen.

Navigation Simulator

If you are not able to take the Getting Started tour

with your boat in the water, you may use the built-in

navigation simulator to practice using the GPS 125

Sounder. To use the simulator, see pg. 60.

Marking a Waypoint

To begin the live tour, let’s take the position you

have acquired (either by just initializing the unit or by

having turning the unit on) and mark it as a waypoint.

1. Press the

key to capture and hold your position.

To mark a position, you must have a 2D or 3D

fix, or have the receiver in simulator mode. If

you try to mark a position without a position fix,

a ‘No GPS Position’ message will be displayed.

The mark position page will appear, showing the

captured position and a default 3-digit waypoint name.

Let’s change the name something more meaningful, like

‘DOCK’.

1. Press the

key once to move the field highlight

from the ‘SAVE?’ field to the name field.

2. Press

to clear the default name.

3. Press and hold the

key to scroll through the alpha-

bet until the letter ‘D’ appears.

Marking A

Waypoint

GETTING

STARTED

To save a waypoint with the

default three-digit name,

simply press the MARK key

followed by the ENTER key.

The GPS 125 Sounder will

then return to the page pre-

viously displayed.

Press the UP arrow to move

forward through the alpha-

bet or numbers and DOWN

to move backward.

125 Man Rev B 7/23/98 11:47 AM Page 10

4. Press the

key once to move the character highlight

to the next character space.

5. Repeat steps 3 and 4 until the word ‘DOCK’ is shown.

6. Press

to complete entry of the name.

7. Press the

key twice to return the field highlight

to the ‘SAVE?’ field.

8. Press the

key to confirm that you want to save

the position as a waypoint named ‘DOCK’.

The mark position page will now be replaced by

the Position Page (or whatever page was displayed

prior to pressing the

key). The ‘DOCK’ waypoint

is now stored in the GPS 125 Sounder’s memory, and

will remain there until you manually remove it or clear

the receiver’s memory. For more on waypoint manage-

ment, see pg. 21-28.

Using the Position and Map Pages

Now that you’ve marked a position, let’s see how

the Position and Map Pages can be used to monitor

your progress as we head out into the open water.

As always, ensure your primary focus is on

boating traffic and monitor the GPS 125

Sounder briefly when operating your boat.

The direction you are moving (track) and your

speed are shown on the top of the Position Page, below

the graphic compass tape. The latitude, longitude, and

approximate altitude of your position--with a resettable

trip odometer--are displayed in the middle of the page,

with the time of day and digital depth shown below.

The arrow keypad is used

for all data entry. Use the

UP and DOWN keys to

select letters, numbers, or

menu options, and use the

LEFT and RIGHT keys to

move the cursor forward or

backward along the line.

GETTING

STARTED

Marking

Waypoint &

Map Page

The Map Page displays

your present position as a

diamond icon and provides

a real-time graphic “bread-

crumb” display of your

track right on the screen.

Altitude

Current Speed

Track Over

Ground

Graphic

Compass Tape

Tr i p

Odometer

Position

Display 12/24 Hour

Time

Digital Depth

125 Man Rev B 7/23/98 11:47 AM Page 11

Using the Position and Map Pages (continued)

Now let’s change the display to the Map Page and

watch the track log of our tour:

1. Press

to change from the Position Page to the

Map Page.

Your current position is shown as the diamond in

the middle of the screen. The dark circle below the dia-

mond represents the position you created, with the line

between the two showing your track.

1. Once you have reached an area that allows for gener-

al changes in direction without interfering in the pas-

sage of other boats, mark your current position again

and name this waypoint “CHANNL”. (See ‘Marking a

Waypoint’ on pg. 10-11).

2. Next, make a moderate turn in any direction safe for

navigation and proceed for another 3 minutes.

Going To a Waypoint

Once you’ve stored the ‘CHANNL’ waypoint in

memory, you can use the GPS 125 Sounder to guide

you to it by performing a simple GOTO. A GOTO is

simply the receiver drawing a straight-line course from

your present position to the destination you’ve selected.

Use caution when navigating. A “straight-line”

course reflects the shortest distance to a way-

point, and does not navigate around obstruc-

tions, such as land or buoys, etc.

Now that you have moved away from ‘CHANNL’ for

three minutes, let’s try navigating back to it.

To select a GOTO destination:

1. Press the

key. The GOTO waypoint page will

appear, displaying all the waypoints in memory in

alphabetical order.

2. Use

to highlight the ‘CHANNL’ waypoint.

3. Press the

key to confirm that you want to navi-

gate to the displayed waypoint. The Highway Page

(default) will appear.

Position/Map

Pages and

GOTO

GETTING

STARTED

The moving map’s default

screen orientation is track

up orientation. “Track up”

means that your current

direction of travel is always

up (or towards the top of)

the screen. It can also be set

for north up, or desired

track orientation through

the map setup page.

The GOTO waypoint page

allows you to select a desti-

nation from a list of all

available waypoints in the

GPS 125 Sounder’s

memory.

125 Man Rev B 7/23/98 11:47 AM Page 12

Using the Highway Page

The GPS 125 Sounder’s Highway Page provides

graphic steering guidance to a destination, with an

emphasis on a straight-line course to the desired way-

point and the distance and direction you are off course.

The bearing and distance to a waypoint, along with

your current track and speed are displayed at the top of

the screen, with your estimated time enroute (ETE) and

velocity made good (VMG), or the speed you are

approaching your destination, shown at the bottom.

As you head toward your destination, the middle

section of the screen provides visual guidance to your

waypoint on a moving graphic “highway”.

Your present position is represented by the dia-

mond in the center of the course deviation scale. The

line down the middle of the highway represents your

desired track.

As you navigate toward a waypoint, the highway

will actually move, indicating the direction you’re off

course, relative to the position diamond on the CDI

scale. When the highway is pointing straight up the

screen, the waypoint is directly ahead. If the destina-

tion waypoint is to the left, the top of the highway will

lead toward the left, and vice versa. To stay on course

simply steer in the direction the highway leads (left or

right) until the highway leads straight up the page.

A waypoint is directly

ahead when the highway is

pointing straight up. In the

above example, the way-

point is to the right (111º) of

our present course (100º).

Turn right until the highway

points straight up the

screen.

GETTING

STARTED

Using the

Highway Page

Once you are one minute

from the destination (based

on your present speed and

course), an arrival message

will appear on the message

page.

Bearing to

Waypoint

Destination

Waypoint

“Finish Line” CDI Scale

Distance to

Waypoint

Destination Waypoint

Digital Depth

Velocity Made

Good

Current Speed

Current Track

Estimated

Time Enroute

Position Diamond

Pointer to Waypoint

125 Man Rev B 7/23/98 11:47 AM Page 13

Using the Highway Page (continued)

While navigating, you may use the Compass Page

(see picture below left) instead of the Highway Page.

To select the Compass Page:

1. While viewing the Highway Page press

twice.

The Compass Page will now become the displayed

navigation page. This page provides a directional point-

er to your destination by using a compass display to

show direction of travel. This provides better steering

guidance at slower speeds for travel with many direc-

tional changes.

To return to the Highway Page, press ENTER twice.

Cancelling a GOTO

If you decide to stop navigating to the active way-

point waypoint, all you have to do is cancel the GOTO.

To cancel an active GOTO:

1. Press the

key.

2. Use the arrow keypad to move the field highlight to the

‘CANCEL GOTO?’ prompt at the bottom of the page and

press

Using the Sounder Page

Now that you have learned the basics of GPS

Navigation, let’s briefly look at how the GPS 125

Sounder works for you as a fishfinder. The fishfinding

features are covered in detail on pg. 37-40.

The top of the Sounder Page shows the range mode

being used, the water temperature (if using a tempera-

ture-sensitive transducer), and the digital depth, while

the middle of the page contains a right-to-left moving

sonar image of the water beneath your boat. (Note:

items appear as they pass under your transducer. Those

objects appearing on the right side of the screen are

closer to you than those objects on the left.) Fish are

displayed as a darkened arch or a fish icon in three dif-

ferent sizes. Thermoclines (layers of water separating

warmer water above and cooler water below) appear as

dotted patterns just above the bottom.

Highway/

Sounder Page &

Cancelling GOTO

GETTING

STARTED

The 125 Sounder will also

provide steering guidance

with a graphic Compass

Page.

To change the display from

the Highway Page, press

ENTER twice.

Once a GOTO is activated,

the GPS 125 Sounder pro-

vides steering guidance

until the GOTO is canceled.

To cancel a GOTO, high-

light the cancel prompt at

the bottom of the page and

press ENTER.

125 Man Rev B 7/23/98 11:47 AM Page 14

Using the Sounder Page (continued)

The area of strongest sonar return (whiteline) is

displayed as light and dark checkering. Typically, the

bottom will be the primary source of the whiteline. A

thin whiteline indicates a softer bottom while a thicker

whiteline shows a harder bottom. A black line is used

to show the point where water meets the whiteline.

This black line will follow the bottom contour, along

with any significant objects lying on the bottom. Along

the left side of the screen (typically) is an adjustable

scale which shows the current display’s range of depth.

Range Modes

The GPS 125 Sounder uses two range modes: auto

and manual. ‘Auto’ displays the most information pos-

sible while continuously displaying the bottom.

‘Manual’ lets you select the displayed range. You may

switch between auto and manual modes by using the

arrow keypad or by using the sounder setup menu.

To switch from auto to manual mode:

1. Press the

keys until the desired depth

range is displayed on the depth scale at the left side

of the page.

2. Press

to confirm the selected range.

To switch from manual to auto mode:

1. Press the arrow keypad up or down until a repeated

beep sounds. ‘Auto’ will be shown in the range field at

the top left corner of the screen, and press

Underwater waypoints

The underwater waypoint feature marks a way-

point’s position and its depth. This makes it easier to

find and use an object such as a stump for a future

fishing location. For instructions on marking an under-

water waypoint, see pg. 38.

Sounder Zoom

The sounder zoom function allows you to see the

current display picture at 2 times (2X) or 4 times (4X)

magnification. 2X means that the screen displayed will

now cover 1/2 the range you were originally viewing in

twice the detail, and 4X shows 1/4 the original range at

four times the detail. Because less area is being shown

(in a zoom screen) objects can be seen in greater detail.

GARMIN’s exclusive See-

Thru technology will allow

you to distinguish sonar tar-

gets from bottom clutter and

thermoclines.

GETTING

STARTED

Sounder Page,

Range Modes, &

Sounder Zoom

Use the target cursor to

mark the desired underwa-

ter location.

Note: The bearing and

range shown are to the cur-

sor’s location from your pre-

sent position.

125 Man Rev B 7/23/98 11:47 AM Page 15

The zoom function is accessed by using the IN and

OUT key when viewing the Sounder Page.

Once activated, the zoomed picture becomes the

Sounder Page display. Note: The zoom function can

only be deactivated by pressing the OUT key until the

original zoom scale appears.

The zoom function operates in either Auto range or

Manual range. Zooming while in Auto will continue to

follow the bottom contour, while zooming in Manual

will show the selected depth.

To access the sounder zoom function:

1. While viewing the Sounder Page, press

once.

The 2X screen will appear. Note: the current zoom scale

will be displayed in the upper left corner of the screen.

2. Press

once more to advance to the 4X screen.

3. To deactivate the sounder zoom function, press

once. You may also press and hold

until the original

scale picture appears and a triple beep sounds.

Moving the Zoom Window

You may move the displayed range on a zoomed

screen at any time, just as you would a non-zoom

screen, by pressing the arrow keypad up or down. This

will move the zoom “window”.

If you prefer to keep the window in its new posi-

tion, you will need to save the change. Note: Saving the

new window position requires different steps if you are

in Auto range when you move the window versus being

in Manual when the window is moved.

To save a zoom window range in Auto:

1. Press the

keypad up to view a shallower range or

down to view a deeper range. The range scale on the

left side of the zoomed picture will be highlighted.

2. When the window reaches the desired range, press

to accept. A ‘Change To Manual Range?’ window

will appear. Highlight ‘Yes” and press

3. If you do not want to save the range, highlight ‘No’ and

press

. You may then resume manually moving the

zoom window.

4. Press

at any time to return to an auto range mode

display.

Sounder Zoom

& Zoom

Window

GETTING

STARTED

Pressing the IN key once

while on the Sounder Page

activates the 2X Zoom.

The zoom window may be

moved at any time by using

the arrow keypad.

125 Man Rev B 7/23/98 11:47 AM Page 16

Moving the Zoom Window (continued)

To save a zoom window range in Manual:

1. Press the

keypad up to view a shallower range or

down to view a deeper range. The range scale on the

left side of the zoomed picture will be highlighted.

2. When the window reaches the desired range, press

to accept.

3. If you do not want to save the range, press

return to the previous window range.

Clearing a Cluttered Map Page Display

After you’ve used the GPS 125 Sounder for a few

trips, you may find that your map display has become

a bit messy from keeping track of your every move. For

practice, let’s clean up the screen by clearing the track

log (the plot points left on the Map Page) we’ve just

created during the Getting Started Tour.

1. Press

until the Menu Page appears.

2. Use the

key to move the field highlight to the

‘TRACK LOG’ option.

3. Press

to access the track log page.

4. Press the

key twice to highlight the ‘CLEAR LOG?’

option. The clear log confirmation page will appear.

5. Use the

key to highlight the ‘Yes?’ prompt.

6. Press

to finish.

Turning the Receiver Off

You’ve now gone through the basic operation of

your new GPS receiver and probably know a little more

than you think about how it works. We encourage you

to experiment with the GPS 125 Sounder until it

becomes an extension of your own navigation skills. If

you encounter any problems using the unit or want to

take advantage of the GPS 125 Sounder’s more

advanced features, refer to the reference section.

To turn the GPS 125 Sounder off:

1. Press and hold the

key for 3 seconds.

Highlight the ‘CLEAR

LOG?’ prompt and press

ENTER to clear the track

log.

Note: Once all 768 points

are used during normal

operation, the oldest point

will be continuously deleted

to make room for the latest

track log point to be stored.

GETTING

STARTED

Clearing the

Map Page &

Power OFF

Holding the POWER key

for three seconds ensures

against unwanted shut-off

by accidentally pressing the

key.

125 Man Rev B 7/23/98 11:47 AM Page 17

Satellite Page

The Satellite Page displays the status of various

receiver functions. The status information will help you

understand what the GPS 125 Sounder is doing at any

given time, and tell you whether or not the receiver has

calculated a position fix.

Sky View and Signal Strength Bars

The sky view and signal strength bars give you an

indication of what satellites are visible to the receiver,

whether or not they are being used to calculate a posi-

tion fix, and the signal quality. The sky view in the cen-

ter of the page shows a bird’s-eye view of the position of

each satellite relative to the receiver’s last known posi-

tion. The outer circle represents the horizon (north up);

the inner circle is 45º above the horizon; and the center

point is a position directly overhead.

When the receiver is looking for a particular satel-

lite, the corresponding signal strength bar will be blank

and the sky view indicator will remain highlighted in

reverse video. Once the receiver has found the satellite,

a hollow signal strength bar will appear, indicating that

the satellite has been found and the receiver is collect-

ing data from it. The satellite number in the sky view

will also change from reverse video to normal presenta-

tion. As soon as the GPS 125 Sounder has collected the

necessary data to use the satellite for positioning, the

hollow bar will become solid.

Satellite Page

Overview

REFERENCE

When backlighting is on, a

bulb icon will appear on the

Satellite Page.

Use the icon to determine if

backlighting is turned on

during daylight hours.

Satellites being tracked but

blocked from use (03,17)

will be displayed in reverse

video, with the correspond-

ing signal strength bar

hollow.

Status

Satellite

Sky View

Satellite

Numbers

Estimated

Position Error

125 Man Rev B 7/23/98 11:47 AM Page 18

Receiver Status and EPE

Receiver status is indicated at the top left of the

screen, with the current horizontal accuracy (estimated

position error, in feet or meters) at the top right. The

status will show one of the following conditions:

Searching— the GPS 125 Sounder is looking for

any available satellites in view.

AutoLocate

—the GPS 125 Sounder is initializ-

ing and collecting new almanac data. This process

can take 7.5 to 15 minutes.

Acquiring— the receiver is collecting data from

available satellites, but has not collected enough

data to calculate a 2D fix.

2D Nav (2D Navigation)–– at least three satellites

with good geometry have been locked onto and a

2-dimensional position fix (latitude and longitude)

is being calculated. ‘2D Diff’ will appear when you

are receiving DGPS corrections in 2D mode.

3D Nav (3D Navigation)— at least four satellites

with good geometry have been locked onto, and

your position is now being calculated in latitude,

longitude and altitude. ‘3D Diff’ will appear when

you are receiving DGPS corrections in 3D mode.

Poor Cvrg (Poor GPS Coverage)— the receiver is

no longer tracking enough satellites for a 2D or 3D

fix.

Not Usable— the receiver is unusable, possibly

due to incorrect initialization or abnormal satellite

conditions. Turn the unit off and back on to reset.

SIM (Simulating Navigation)— the receiver is in

simulator mode.

EZinit Option Prompt

The Satellite Page also provides access to the EZinit

prompt whenever a position fix has not been calculated

(the unit must be in searching, AutoLocate, acquiring,

simulator or poor coverage status). This allows you to

manually reinitialize the unit (see pg. 6-7 for instruc-

tions), and is useful if you have traveled over 500 miles

with the receiver off and you know it must be initial-

ized to your new position (the GPS 125 Sounder will

automatically offer the EZinit prompt after 10 minutes

of unsuccessful satellite acquisition).

A ‘POOR CVRG’ status

will appear on the Satellite

Page if the receiver has lost

the satellites required to

compute a fix. Make sure

the external antenna is not

covered and is connected to

the GPS 125 Sounder.

REFERENCE

Receiver Status

& EZinit

If you travel more than 500

miles with the receiver off,

reinitialize the unit to your

new position by using the

EZinit feature. To access

EZinit, press ENTER from

the Satellite Page before any

satellites are acquired.

125 Man Rev B 7/23/98 11:47 AM Page 19

Screen Backlighting

The GPS 125 Sounder features three levels of back-

lighting. Activate the backlight by pressing the POWER

key briefly. Each press of the button advances the back-

lighting to the next level and then turns it off.

Backlighting will remain on until turned off.

Position Page

The GPS 125 Sounder’s Position Page shows you

where you are, the direction you are heading, and your

speed (up to 99.9 mph), and is most useful when you

are traveling without an active destination waypoint. A

compass tape at the top of the page displays your cardi-

nal heading (while moving), with current track and

speed over the ground indicated below. The rest of the

page shows your present position in three dimensions

(latitude, longitude and altitude). The units of measure

for speed, distance, position and altitude are user-selec-

table through the navigation setup menu (see pg. 53).

The 12/24-hour clock and time offset options are avail-

able from the system setup menu (see pg. 52).

Trip Odometer

The Position Page also features a resettable trip

odometer to measure your total distance traveled.

To reset the trip odometer:

1. Press the

key until the trip field is highlighted.

2. Press

followed by

3. Press

to finish.

Altitude Display

When the GPS 125 Sounder is acquiring satellites or

navigating in the 2D mode, the last known altitude will

be used to compute your position. If the altitude shown

is off by several hundred feet, you can manually enter

your altitude for greater accuracy. Note that GPS alti-

tudes can fluxuate due to errors.

To enter an altitude:

1. Press the

key until the altitude field is highlighted

and press

2. Use the arrow keypad to enter the altitude and press

Backlighting &

Position Page

REFERENCE

The speed and track dis-

played on the Position Page

may fluxuate at slow speeds

(or when you’re standing

still) because of position

errors caused by Selective

Availability.

To reset the trip odometer,

highlight the trip field and

press ENTER. Use the

LEFT arrow key to clear the

distance field, and press

ENTER to confirm.

125 Man Rev B 7/23/98 11:47 AM Page 20

Marking and Saving Waypoints

Knowing your present position is only part of any

navigation equation. You also need to keep track of

where you’ve been and where you are going.

Waypoints serve as electronic markers that let you keep

track of starting points, destinations, navaids and any

other important position.

The GPS 125 Sounder allows you to mark, store

and use up to 250 waypoints. A waypoint position can

be entered by taking an instant electronic fix, by manu-

ally entering coordinates, or by entering range and

bearing in reference to an existing waypoint. If you try

to mark a waypoint without having a position fix,

you’ll be notified with a ‘No GPS Position’ message.

To mark your present position:

1. Press the

key to capture your position.

The mark position page will appear, showing the

captured position and a default 3-digit waypoint name.

To change the default position name:

1. Press the

key once to move the field highlight

from the ‘SAVE?’ field to the name field.

2. Press

to clear any existing data and begin entry

of the name.

3. Use the arrow keypad to enter the name.

4. Press

to confirm the waypoint name. The field

highlight will move to the “comment” field.

If you’d like to add this waypoint to a route:

1. Press

once to highlight the route field and press

the

key.

2. Use the

keys to enter a route number

and press

3. Press the

key again to save the waypoint.

If you do not want to add this waypoint to a

route:

1. Highlight the ‘SAVE?’ field and press the

key.

The GPS 125 Sounder will

automatically name new

waypoints with a default

three-digit name, with the

current digital depth as the

default comment. You may

then highlight either field,

press ENTER, and enter

your own name or

comment.

REFERENCE

Marking &

Saving

Waypoints

To add a waypoint to a

route as you are marking its

position, enter the desired

route number, highlight

‘SAVE?’ and press ENTER.

125 Man Rev B 7/23/98 11:47 AM Page 21

Waypoint Submenus

The GPS 125 Sounder has three waypoint submenu

pages that let you manage a large number of waypoints

quickly and efficiently. The nearest waypoints, waypoint

list and waypoint definition pages are accessed through

the Menu Page.

To select a waypoint submenu page:

1. Press

until the Menu Page appears.

2. Use the

and

keys to highlight the waypoint

submenu page you want to use.

3. Press

to display the submenu page.

4. To return to the Menu Page, press the

key.

Nearest Waypoints Page

The nearest waypoints page shows the nine nearest

waypoints that are within 100 miles of your present

position, with the bearing and range noted for each

waypoint. During an emergency, the nearest waypoints

page can give you the closest points of safety in your

area at a glance.

The nearest waypoints page will also let you retrieve

a waypoint definition page or go to a selected waypoint

right from the list.

To review the waypoint definition page of a high-

lighted waypoint from the list:

1. Press the

key.

To return to the nearest waypoint page (when the

‘DONE?’ field is highlighted):

1. Press the

key.

To go to a highlighted list waypoint:

1. Use the

and

keys to highlight a listed way-

point.

2. To select a highlighted nearest waypoint as a destina-

tion, press the

key.

3. Once the GOTO waypoint page appears, press the

key to confirm the selected waypoint as your

destination.

Nearest

Waypoints Page

REFERENCE

To select a waypoint sub-

menu, highlight the desired

option and press ENTER.

The compass heading

(BRG) and distance (DST)

to the nine nearest way-

points are updated continu-

ously.

125 Man Rev B 7/23/98 11:47 AM Page 22

Waypoint List Page

The waypoint list page provides you with a com-

plete list of all waypoints currently stored in the GPS

125 Sounder. The total number of used and empty

waypoints is indicated above the waypoint list. From

the waypoint list page, you can retrieve a waypoint def-

inition page, delete all user-defined waypoints, or go to

a selected waypoint. If a waypoint is currently used in a

route, the lowest route number will be indicated to the

left of the waypoint name.

To review the waypoint definition page of a high-

lighted list waypoint:

1. Press the

key.

To return to the waypoint list page (ensure

‘DONE?’ is highlighted):

1. Press the

key.

To go to a list waypoint:

1. Use the

and

keys to scroll through the list

and select a waypoint.

2. To select a highlighted waypoint as a destination,

press the

key.

3. Once the GOTO waypoint page appears, press the

key to confirm the selected waypoint as your

destination.

To delete all user-defined waypoints:

1. Use the

keys to move the cursor high-

light to the ‘DEL ALL WPTS?’ field.

2. Press the

key.

A warning page will appear, asking if you are sure

you want to delete all user-defined waypoints and

routes. If you want to continue and delete:

1. Press the

key to highlight the ‘Yes?’ field.

2. Press the

key.

3. Press the

key to return to the Menu Page.

If you do not want to delete all waypoints:

1. Highlight ‘No?’ and press

The total number of used

and available waypoints is

indicated at the top of the

page. Route waypoints are

indicated by an ‘R__’.

Above, R03 means route 3.

REFERENCE

Waypoint List

Page

Deleting all user waypoints

will also delete all routes

stored in memory.

125 Man Rev B 7/23/98 11:47 AM Page 23

Waypoint Definition Page

The last of the three waypoint management pages is

the waypoint definition page. This page lets you create

new waypoints manually, or review and edit existing

waypoints.

To create a new waypoint manually, you’ll need to

know its position coordinates or its distance and bear-

ing from an existing waypoint.

To create a waypoint by entering coordinates:

1. If a waypoint is currently displayed in the name field,

highlight ‘NEW?’ and press

. Then press the

key to clear the name field.

2. If a waypoint is not displayed, move the cursor to the

name field and enter the new waypoint’s name.

3. Use

and

to enter your waypoint name and

use

and

to move to the next character position.

4. Press

to confirm the waypoint name. The posi-

tion field will now become highlighted, with the receiv-

er’s last known position shown, if one exists.

5. Press

to begin entry of the position.

6. Use the

and

keys to enter your position, and

use the

and

keys to move to each character

field.

7. Press

to confirm and save your coordinates. The

default waypoint comment (UTC date and time of cre-

ation) will appear, and the highlight will move to

‘DONE?’.

8. Press the

key to return to the Menu Page.

Waypoint

Definition Page

REFERENCE

Use the waypoint definition

page to review, rename, or

delete stored waypoints and

to create new waypoints

manually.

To create a new waypoint

by manually entering coor-

dinates or by referencing an

existing waypoint, highlight

the ‘NEW?’ prompt and

press the ENTER key.

Waypoint

Name

Reference

Waypoint Distance from

Reference

Waypoint

Position

Coordinates

Bearing from

Reference

Waypoint

Function Prompts

Waypoint Comment

125 Man Rev B 7/23/98 11:47 AM Page 24

The GPS 125 Sounder’s

advanced waypoint and

planning features allow you

to create new waypoints

and practice navigation

without ever leaving the

slip.

If you create a new way-

point by entering coordi-

nates from a map, you may

want to re-mark the way-

point’s exact position once

you get there. To re-define

an existing waypoint’s posi-

tion coordinates from the

waypoint definition page,

simply highlight the ‘DST’

field and press ENTER. Use

the LEFT arrow key to set

the distance to 0.00, and

press ENTER to confirm.

The old coordinates will be

replaced by the coordinates

of your present position

(you must have a valid 2D

or 3D position fix).

Reference Waypoints

To create a new waypoint manually without know-

ing its position coordinates, you’ll need to enter its

bearing and distance from an existing waypoint. The

GPS 125 Sounder will then calculate the position coor-

dinates for you.

To create a new waypoint by referencing a stored

waypoint:

1. Press

until the ‘NEW?’ field is highlighted.

2. Press

3. Enter the name of your new waypoint.

4. Press the

key to confirm the waypoint name.

The position field will now become highlighted, with

the receiver’s last known position shown.

5. Press

to move the cursor to the reference field.

6. Press

to begin entry of the reference waypoint.

7. Use the arrow keypad to enter the waypoint name.

8. Press the

key to confirm your entry.

9. Enter the bearing and distance of your new waypoint

from the reference waypoint. Remember to use the

key to begin entry and confirm each field. The

coordinates will be calculated and saved for your

new waypoint.

10. Press the

key (with the ‘DONE?’ field highlight-

ed) to return to the Menu Page.

REFERENCE

Reference

Waypoints

125 Man Rev B 7/23/98 11:47 AM Page 25

Editing Existing Waypoints

The waypoint definition page also allows you to

change the name, coordinates, comment or reference

waypoint field for a stored waypoint. (Fields shown on

pg. 24.)

To edit the name, coordinates, comment, or refer-

ence waypoint field:

1. Use

and

to highlight the field you want to

edit.

2. Press

to begin entry in the selected field.

3. Enter your new data.

4. Press the

key to confirm your changes.

Waypoint Comments

Each waypoint stored in the GPS 125 Sounder has a

user-defined 16-character comment field. The default

comment is the UTC date and time of the waypoint’s

creation.

To change or add a comment:

1. Use the

and

keys to highlight the comment

field.

2. Press

to begin entry of your comment.

3. Enter the comment and press the

key to confirm.

Renaming and Deleting Waypoints

The rename and delete function fields are located at

the bottom left of the waypoint definition page (you’ll

need to use the

key to move the field highlightout of

its standard up-and-down scrolling sequence).

Editing,Deleting,

& Renaming

Waypoints

REFERENCE

The waypoint comment

field will automatically dis-

play the date and time of

creation of the waypoint.

You may replace this with a

16-character custom com-

ment at any time.

To access the rename func-

tion from the waypoint def-

inition page, highlight the

‘RENAME?’ prompt and

press ENTER.

125 Man Rev B 7/23/98 11:47 AM Page 26

To rename a stored waypoint:

1. Highlight the ‘RENAME?’ field and press

2. Enter the new waypoint name and press

3. Press the

key to confirm your changes.

To delete a stored waypoint:

1. Highlight the ‘DELETE?’ field and press

2. Press the

key to select the ‘YES’ prompt.

3. Press

to delete the waypoint.

Scanning Waypoints

As you manually enter a waypoint’s name, the GPS

125 Sounder’s waypoint scanning feature will automati-

cally display the first numerical or alphabetical match

of the character you have entered to that point. This

helps eliminate the need to always enter a waypoint’s

complete name.

To scan waypoints from a waypoint field:

1. Highlight the waypoint name field and press

2. Press the

key to clear the name field.

3. Use the

and

keys to scroll through way-

points.

4. If you have more than one waypoint that begins with

the same letter or number, you must use the

key to

move to the next character positions as needed. Only

the first character match is listed for each character

set.

5. Once you’ve found the desired waypoint, press

A warning page will ask you

for confirmation to delete

the selected waypoint.

Note: If a waypoint is part

of a route, you will need to

remove it from the route

before it can be deleted. (See

pg. 36)

REFERENCE

Editing and

Scanning

Waypoints

Waypoint names will

appear alphabetically

when scanning waypoints.

If two waypoints begin with

the same letter(s) you must

move the cursor to the first

letter they do not have in

common for them to appear.

125 Man Rev B 7/23/98 11:47 AM Page 27

Selecting a GOTO Destination

The GPS 125 Sounder provides four ways to navi-

gate to a destination: GOTO, MOB, TracBack and route

navigation. The most basic method of selecting a desti-

nation is the GOTO function, which lets you choose

any stored waypoint as the destination and quickly sets

a direct course from your present position.

To activate the GOTO function:

1. Press the

key. The GOTO waypoint list, an alpha-

betical list of all available waypoints, will appear.

2. Use the

and

keys to select the waypoint you

want to navigate to (it may already be highlighted).

3. Press the

key to confirm, or

to stop selec-

tion of a GOTO destination and return to the previous

page.

Once a GOTO waypoint has been activated, the

Compass Page or Highway Page will provide steering

guidance to the destination until either the GOTO is

cancelled or the unit has resumed navigating the active

route (see pg. 36).

To cancel an active GOTO:

1. Press the

key.

2. Use the arrow keypad to move the field highlight to the

‘CANCEL GOTO?’ prompt at the bottom of the page and

press

Man Overboard Function

The GPS 125 Sounder’s man overboard function

(MOB) lets you simultaneously mark and set a course to

a position for quick response to passing positions (like

the spot where your hat blew overboard).

To activate the MOB mode:

1. Press the

key. The GOTO waypoint page will

appear with ‘MOB’ selected as the default destination.

2. Press the

key to begin MOB navigation.

The GPS 125 Sounder will now guide you to the

MOB waypoint until the MOB GOTO is cancelled (see

“to cancel an active GOTO” above). If you want to save

the MOB waypoint, be sure to rename it, because it will

be overwritten the next time a MOB is executed.

Starting/Stopping

a GOTO & MOB

REFERENCE

Select a destination way-

point from the GOTO way-

point list.

Once the MOB mode has

been activated, steering

guidance will be provided

by the Highway or Compass

Page. Activating another

MOB will replace the previ-

ous MOB waypoint.

125 Man Rev B 7/23/98 11:47 AM Page 28

TracBack Navigation

The third method of navigating to a destination is

by using the GPS 125 Sounder’s TracBack feature. The

TracBack function allows you to quickly and easily

retrace your path using the track log automatically

stored in the receiver’s memory. The advantage of the

TracBack feature is to eliminate the need to mark way-

points along the way and manually create and activate

a route back to where you began your trip.

The TracBack route is created by reducing your

current track log into a route of up to 30 waypoints,

and activating an inverted route along those points.

Once activated, a TracBack route will lead you back to

the oldest track log point stored in memory, so it’s usu-

ally a good idea to clear the existing track log at the

starting point of your current trip (e.g. your car or the

dock) before you get started.

To clear the track log and define a starting point

for a TracBack route:

1. From the Menu Page, highlight ‘TRACK LOG’.

2. Press

to access the track log page.

3. Use the

key to highlight the ‘CLEAR LOG?’ option.

4. Press

. A confirmation page will appear.

5. Use

to highlight the ‘Yes?’ prompt and press

To activate a TracBack route:

1. From the Menu Page, highlight ‘TRACK LOG’ option.

2. Press

to access the track log page.

3. Highlight the ‘TRACBACK?’ option and press

Once the TracBack function has been activated, the

GPS 125 Sounder will take the track log currently

stored in memory and divide it into segments called

legs. Up to 30 temporary waypoints (e.g., ‘T001’) will

be created to mark the most significant features of the

track log in order to duplicate your exact path as close-

ly as possible. A TracBack route from your present

position to the oldest track log point will be created as

an active route (the active route page will appear), and

provide steering guidance to each waypoint back to the

starting point of your track log.

Clearing the log before you

get started will define the

position the TracBack func-

tion will return you to.

REFERENCE

TracBack

Navigation

Highlight ‘TRACBACK?’

and press ENTER to begin

TracBack navigation.

125 Man Rev B 7/23/98 11:47 AM Page 29

Tips on Creating and Using the TracBack Feature

The GPS 125 Sounder’s TracBack feature is designed

to help you quickly create and activate a route that fol-

lows your path back to a user-defined starting point. To

get the most out of the TracBack feature, remember the

following tips:

• Always clear your track log at the exact point that

you want to return to ( truck, dock, etc.).

• The ‘RECORD’ option on the track log setup page

must be set to the ‘Yes’ position.

• There must be at least two track log points stored

in memory to create a TracBack route.

• If there are not enough available waypoints in

memory to create a TracBack route, you will be

alerted with a ‘waypoint memory full’ message,

and the receiver will use any available waypoints

to create a TracBack route with an emphasis on

the track log closest to the destination (the oldest

track log point in memory).

• If the ‘CRITERIA’ option on the track log setup

page is set to a time interval, the TracBack route

may not follow your exact path (the ‘Automatic’

setting will provide the best TracBack route).

• If the receiver is turned off or you lose satellite

coverage during your trip, the TracBack route will

simply draw a straight line between any point

where coverage was lost and where it resumed.

• If the changes of direction and distance of your

track log are very complex, 30 waypoints may not

be enough to accurately mark your exact path.

The receiver will then assign the 30 waypoints to

the most significant points of your track.

• If you want to save a TracBack route, copy route 0

to an open storage route before activating another

TracBack. Activating another TracBack or storage

route will overwrite the existing TracBack route.

• Whenever a TracBack route is activated, tempo-

rary waypoints (e.g., ‘T001’) that are not con-

tained in routes 1-19 are erased. If there are tem-

porary waypoints stored in routes 1-19, the

receiver will create any new temporary waypoints

using the first three-digit number available.

TracBack

Navigation

REFERENCE

The TracBack feature will

navigate your track log

back to the oldest point in

the receiver’s memory.

The track log will be divided

into segments with tempo-

rary waypoints to create a

route back to the beginning

of the track log.

125 Man Rev B 7/23/98 11:47 AM Page 30

Creating and Navigating Routes

The last form of navigating to a destination with

the GPS 125 Sounder is by creating a user-defined

route. The route navigation feature lets you plan and

navigate a course from one place to another using a set

of pre-defined waypoints. Routes are often used when

it’s not practical, safe, or possible to navigate a direct

course to a particular destination (e.g., through a body

of water or impassable terrain).

Routes are broken down and navigated in smaller

segments called “legs”. The waypoint you are going to

in a leg is called the “active to” waypoint, and the way-

point immediately behind you is called the “active

from” waypoint. The line between the “active to” and

the “active from” waypoint is called the “active leg”.

Whenever you activate a route with the GPS 125

Sounder, it will automatically select the route leg clos-

est to your position as the active leg. As you pass each

waypoint in the route, the receiver will automatically

sequence and select the next waypoint as the “active to”

waypoint.

REFERENCE

Route

Navigation

Waypoint 2

(“active to” waypoint)

Waypoint 1

(“active from” waypoint)

“Active Leg”

}

125 Man Rev B 7/23/98 11:48 AM Page 31

Route Definition Page

The GPS 125 Sounder lets you create and store up

to 20 routes of 30 waypoints each. Routes are created,

copied, and edited through the route definition page,

which is accessed through the Menu Page.

To select the route definition page:

1. Press

until the Menu Page appears.

2. Use the

and

keys to highlight the ‘ROUTES’

option.

3. Press the

key to display the route definition

page.

4. To return to the Menu Page, press

The route number field is displayed at the top of the

page, with a 16-character user comment below. If no

user comment is entered, the field will display the first

and last waypoint in the route. The waypoint list in the

middle of the page accepts up to 30 waypoints for each

route, with fields for desired track and distance between

legs. The total distance of the route is indicated below

the waypoint list.

The bottom of the route definition page features

several function fields which let you copy, clear, invert,

or activate the displayed route. Routes 1-19 are used as

storage routes, with route 0 always serving as the active

route you are navigating. If you want to save a route

currently in route 0, be sure to copy it to another open

route, as it will be overwritten by the next route

activation.

Route Definition

Page

REFERENCE

If you’re heading out with-

out a planned route, the

mark function can be used

to quickly create a route

back to your starting point.

Create a series of waypoints

along the way with the

MARK key and save them

to an open route from the

mark position page. When

you’re ready to head back,

simply activate the route

you created in inverted

order (see pg. 34).

Comment

Field

Desired

Track of Leg

Total Route

Distance

Route

Number

Copy Field

Function Prompts

Leg Distance

125 Man Rev B 7/23/98 11:48 AM Page 32

To create a route from the route definition page:

1. Highlight the route number field and press

2. Enter a route number and press the

key to con-

firm.

3. Press

to begin entry of a route comment. (Note

that the default [first and last waypoint] comment will

only appear if the comment field is blank.)

4. Enter your comment and press the

key.

5. Highlight the No. 1 waypoint field and press

6. Enter the first waypoint of your route and press

7. Continue entering the rest of your waypoints in order,

using the

key to start and confirm each field

entry. The list will automatically scroll down.

8. After you have entered all your waypoints, press

Copying and Clearing Routes

The route definition page is also used to copy a

route to another route number. This feature is useful

when you make changes to the active (or TracBack)

route and want to save the route for future use.

To copy a route:

1. Highlight the route number field and press

2. Enter the route number to be copied and press

3. Highlight the ‘COPY TO’ field and press

4. Scroll through the available routes and select a desti-

nation route number. Only open routes will be avail-

able as choices. Press the

key to copy the

route.

5. Press the

key to return to the Menu Page.

To clear a route from memory:

1. Highlight the route number field and press

2. Enter the route number and press

3. Select the ‘CLR?’ prompt and press

Enter each waypoint in the

order you would like to nav-

igate them. If you enter a

waypoint not stored in

memory, you’ll need to

define the position on the

waypoint definition page.

REFERENCE

Creating,

Copying, &

Clearing Routes

To copy a route, select an

open storage route and

press the ENTER key. If you

select a route that is already

used, you’ll be alerted with

a ‘Route Full’ Message.

125 Man Rev B 7/23/98 11:48 AM Page 33

Clearing Routes (continued)

The clear route warning will appear, asking you to

confirm that you want to remove all waypoints from the

route.

1. Highlight the ‘Yes?’ field with the

key.

2. Press

to confirm your action.

3. Press

to return to the Menu Page.

Activating and Inverting Routes

After a route has been entered, it can be activated in

its defined sequence or inverted from the route defini-

tion page. The process of activating or inverting a stored

route takes a storage route (routes 1-19) and copies it

into the active route (route 0) for navigation. The stor-

age route is now no longer needed and will be retained

in its original format under its existing route number.

This system allows you to have an active route that

you may edit during navigation and save as an entirely

new route from the original. You will have to copy the

active route to an unused storage route to save it, since

new route or TracBack activation overwrites route 0.

To activate a route:

1. Select the route definition page and press the

key to activate the route number field.

2. Enter the route number to be activated and press

3. Move the field highlight to the ‘ACT?’ prompt and press

the

key.

Inverting a route allows you to navigate route legs in

reverse order without editing the original route.

To activate a route in inverted order:

1. Follow the steps above, but select the ‘INV?’ prompt

and press

Clearing,

Activating, and

Inverting Routes

REFERENCE

Clearing a route only

removes the waypoints from

the route selected. The way-

points used for the route

will still remain in memory

individually.

To activate a route, high-

light the ‘ACT?’ prompt and

press ENTER.

125 Man Rev B 7/23/98 11:48 AM Page 34

Active Route Page

Once a route has been activated, the active route

page will appear, displaying the waypoint sequence of

your route with the estimated time enroute (ETE) at

your present speed and distance to each waypoint. As

long as you are navigating an active route, the active

route page will become part of the primary page

sequence of the unit.

The active route page will also allow you to change

the ETE field to display desired track (DTK) or estimat-

ed time of arrival (ETA) for each leg. In addition, you

can also clear or invert the active route.

To display DTK or ETA for each leg:

1. Highlight the estimated time enroute (ETE) field and

press the

key.

2. Use the

keys to select ‘DTK’ or ‘ETA’ and

press the

key.

The active route page also allows you to clear (stop

navigating) or invert the active route without using the

route definition page.

To invert a route from the active route page:

1. Press the

key once to move the field highlight to

the ‘INVERT?’ prompt.

2. Press the

key to invert the route.

To clear the active route from the active route

page and stop route navigation:

1. Use the

and

keys to select the ‘CLEAR?’

prompt.

2. Press the

key to clear the active route.

Editing Routes

Once a route has been created and stored, it can be

edited at any time, even if it is the active route.

To edit a route from the active route page or the

route definition page:

1. Use the

and

keys to select the waypoint

you want to edit and press

Whenever you have activat-

ed a route, the active route

page will appear in the pri-

mary page sequence after

the Highway/Compass

Page.

REFERENCE

Active Route

Page

To edit or review a route

waypoints from the active

route page, highlight the

desired waypoint and press

ENTER.

125 Man Rev B 7/23/98 11:48 AM Page 35

Editing Routes (continued)

An on-screen menu of editing choices will appear,

with options for reviewing, inserting, deleting, or

changing the waypoint field highlighted. Use the

and

arrow keys to select among the editing choices.

Once you’ve selected a waypoint from the route

list, choose a menu function:

1. To review the definition page for the waypoint, high-

light the ‘REVIEW?’ prompt and press

2. To add a new waypoint preceding the selected way-

point, highlight the ‘INSERT?’ prompt and press

3. To remove the selected waypoint, highlight the

‘REMOVE?’ prompt and press the

key.

4. To replace the selected waypoint with a new way-

point, highlight the ‘CHANGE?’ prompt and press

Use the route waypoint editing instructions

described earlier for creating a route to complete your

changes. If you are editing the active route (route 0),

copy your new route version to an empty route to save

it, because the active route will be overwritten by a new

route activation.

If you add, delete, or change the first or last way-

point of a route, the default comment (first and last

waypoint) will automatically be updated.

On-Route GOTOs

At the beginning of this section, we mentioned that

the GPS 125 Sounder will automatically select the route

leg closest to your position as the active leg. This will

give you steering guidance to the desired track of the

active leg. If you would prefer to steer directly to a

route waypoint, you can perform an “on-route GOTO”

from the active route page.

1. Use the

and

keys to highlight the desired

route waypoint and press the

key.

2. Once the GOTO waypoint page appears, press

confirm.

Note that after you reach the on-route GOTO way-

point, the GPS 125 Sounder will automatically resume

navigating the rest of the route in sequence.

Editing Routes&

On-Route

GOTO’s

REFERENCE

Use the on-screen menu to

select the desired editing

function.

You can skip ahead and

navigate to any route way-

point by highlighting the

desired waypoint and press-

ing the GOTO key.

125 Man Rev B 7/23/98 11:48 AM Page 36

Sounder Page

The Sounder Page lets you use the GPS 125 as a

fishfinder. The top of the screen shows the range mode

being used, the water temperature (if using a tempera-

ture-sensitive transducer), and the digital depth, while

the middle of the page contains a right-to-left moving

sonar image of the water beneath your boat. (Note:

items appear as they pass under your transducer. Those

objects appearing on the right side of the screen are

closer to you than those objects on the left.) Fish are

displayed as a darkened arch or a fish icon in three dif-

ferent sizes. Thermoclines (layers of water separating

warmer water above and cooler water below) appear as

dotted patterns just above the bottom.

The area of strongest sonar return (whiteline) is

displayed as a mix of light and dark checkering.

Typically, the bottom will be the primary source of the

whiteline. A thin whiteline indicates a softer bottom

while a thicker whiteline shows a harder bottom. A

black line is used to show the point where water

meets the whiteline. This black line will follow the bot-

tom contour, along with any significant objects lying

on the bottom. Along the left side of the screen (typi-

cally) is an adjustable scale which shows the current

display’s range of depth.

Range Modes

The GPS 125 Sounder uses two range modes: auto

and manual. ‘Auto’ displays the most information pos-

sible while continuously displaying the bottom.

‘Manual’ lets you select the displayed range. You may

switch between auto and manual modes by using the

arrow keypad or by using the sounder setup menu.

GARMIN’s exclusive See-

Thru technology will allow

you to distinguish sonar tar-

gets from bottom clutter and

thermoclines.

REFERENCE

Sounder Page

Overview &

Range Modes

The GPS 125 Sounder uses

Depth Controlled Gain

(DCG) to give you the max-

imum amount of informa-

tion possible with minimal

distortion.

Digital Depth

Sonar Target

Arches

Black Line

Range Mode

Water Temperature

(if equipped)

Thermocline

Whiteline

125 Man Rev B 7/23/98 11:48 AM Page 37

To switch from auto to manual mode:

1. Press the

keys until the desired depth

range is displayed on the depth scale at the left side of

the page.

2. Press

to confirm the selected range.

To switch from manual to auto mode:

1. Press the arrow keypad up or down until you hear a

repeated beep. ‘Auto’ will be displayed in the range

field at the top left corner of the screen.

2. Press

Underwater Waypoint Feature

The underwater waypoint feature marks a way-

point’s position and its depth. This makes it easier to

find and use an object such as a stump for a future fish-

ing location. The target’s depth will be shown on the left

or right side of the screen depending on the location of

the cursor, and will move up and down as the cursor

moves.

To mark an underwater waypoint:

1. Press

to pause the screen movement.

2. Use the arrow keypad to activate and move the cursor

onto the desired target (underwater drop off, stump,

etc.). A data field will appear, showing the cursor’s dis-

tance and bearing from your position. Since the dis-

tance and bearing shown are measured from the boat

to the waypoint, they will change as your boat moves,

even if the cursor is stationary.

Note: The cursor will not move off the paused display

and cannot show an area that has scrolled off the

screen.

3. Press

. A page will appear with the waypoint’s

coordinates, default three digit name, and depth.

4. Enter any waypoint information such as name, com-

ment, etc., and press

. Note: the waypoint’s depth

is the default comment. It is possible for a custom

comment to type over this number.

5. When finished, highlight ‘SAVE?’ and press

. The

Sounder Page will reappear.

6. To resume screen movement, press

Range Modes &

Underwater

Waypoints

REFERENCE

Use the target cursor to

mark the desired underwa-

ter location.

Note: The bearing and

range shown are to the cur-

sor’s location from your pre-

sent position.

The underwater waypoint

will be marked using the

sounder position.

The default comment will

be the cursor’s depth.

125 Man Rev B 7/23/98 11:48 AM Page 38

Zoom Function

The sounder zoom function allows you to see the

current display picture at 2 times (2X) or 4 times (4X)

magnification. 2X means that the screen displayed will

now cover 1/2 the range you were originally viewing in

twice the detail, and 4X shows 1/4 the original range at

four times the detail. Because less area is being shown

(in a zoom screen) objects can be seen in greater detail.

The zoom function is accessed by using the IN and

OUT key when viewing the Sounder Page. The sounder

zoom function is divided into two display levels:

• 2X - Displays the zoomed screen at 1/2 the

original range.

• 4X - Displays the zoomed screen at 1/4 the

original range.

Once activated, the zoomed picture becomes the

Sounder Page display. Note: The zoom function can

only be deactivated by pressing the OUT key until the

original zoom scale appears.

The zoom function operates in either Auto range or

Manual range. Zooming while in Auto will continue to

follow the bottom contour, while zooming in Manual

will show the selected depth.

To access the sounder zoom function:

1. While viewing the Sounder Page, press

once.

The 2X screen will appear. Note: the current zoom scale

will be displayed in the upper left corner of the screen.

2. Press

once more to advance to the 4X screen.

3. To deactivate the sounder zoom function, press

once. You may also press and hold

until the original

scale picture appears and a triple beep sounds.

Moving the Zoom Window

You may move the displayed range on a zoomed

screen at any time, just as you would a non-zoom

screen, by pressing the arrow keypad up or down. This

will move the zoom “window”.

If you prefer to keep the window in its new posi-

tion, you will need to save the change. Note: Saving the

new window position requires different steps if you are

in Auto range when you move the window versus

being in Manual when the window is moved.

Pressing the IN key once

while on the Sounder Page

activates the 2X Zoom.

REFERENCE

Zoom Function

& Zoom

Window

The 4X zoom shows objects

at 4 times magnification

and 1/4 the original range

scale.

125 Man Rev B 7/23/98 11:48 AM Page 39

To save a zoom window range in Auto:

1. Press the

keypad up to view a shallower range or

down to view a deeper range. The range scale on the

left side of the zoomed picture will be highlighted.

2. When the window reaches the desired range, press

to accept. A ‘Change To Manual Range?’ window

will appear. Highlight ‘Yes” and press

3. If you do not want to save the range, highlight ‘No’ and

press

. You may then resume manually moving the

zoom window.

4. Press

at any time to return to an auto range mode

display.

To save a zoom window range in Manual:

1. Press the

keypad up to view a shallower range or

down to view a deeper range. The range scale on the

left side of the zoomed picture will be highlighted.

2. When the window reaches the desired range, press

to accept.

3. If you do not want to save the range, press

return to the previous window range.

Sounder Setup

The sounder displays can be customized to fit your

needs from the sounder setup submenu accessed from

the Menu Page (See pg. 58-61).

Zoom Window

REFERENCE

If you activate the zoom

while in Auto range mode

and then decide to manual-

ly adjust the range, a mes-

sage window will appear.

Highlight ‘Yes’ and press

ENTER to activate Manual

range mode and continue

manually adjusting the

range.

The zoom window may be

moved at any time by using

the arrow keypad.

125 Man Rev B 7/23/98 11:48 AM Page 40

Map Page

The GPS 125 Sounder features a real-time moving

map that can do much more than just plot your course

and route. The Map Page also provides you with a tar-

get cursor that will let you pan ahead to nearby way-

points, determine the distance and bearing to any map

position, and mark new waypoints while you navigate.

The map contains 12 selectable range scales from

0.2 to 320 miles (0.5 to 600 km). The scale represents

the distance shown from the top of the screen to the

bottom. Move from scale to scale by using the dedicat-

ed zoom keys (IN and OUT). Press IN for a smaller

scale map and press OUT for a larger scale map.

A diamond icon in the center of the page represents

your present position, with your track and/or route dis-

played as a solid line. Nearby waypoints are shown as

squares, with the corresponding name listed. You may

select which items are shown through the map setup

submenu page (see pg. 56 for more information).

The four corners of the Map Page are used to dis-

play various navigation data, including the bearing and

distance to a destination waypoint and your current

track and speed over the ground. The two fields at the

top corners of the map show your bearing and distance

to one of three selectable destinations: an active desti-

nation waypoint; a highlighted on-screen waypoint; or

the panning target crosshair. If you are not navigating

to a waypoint or using the panning function, the top

data fields will not be displayed. The bottom corners of

the display always show your current track and speed,

with the digital depth shown in the center.

The GPS 125 Sounder has

on-screen range rings to

help you estimate distances

relative to your present

position. The value of each

ring is determined by the

current zoom scale, and is

equal to 1/5 of the selected

scale.

To turn the range rings dis-

play on or off (the default

setting is OFF) see the map

setup instructions on pg. 55-

56.

REFERENCE

Map Page

Bearing to

Waypoint

Track Over

Ground

Speed Over

Ground

Distance to

Waypoint

Present

Position

Digital Depth

125 Man Rev B 7/23/98 11:48 AM Page 41

Zooming, Panning, and Pointing

There are three main functions you can perform

from the Map Page: zooming, panning, and pointing.

Zooming is increasing or decreasing the display scale of

the map. Panning is using a target crosshair and the

arrow keypad to “slide” your view of the map in any

direction, including diagonally, to view the surrounding

area. “Pointing” is the act of highlighting a waypoint on

the map in order to find out more about the waypoint

and conduct a GOTO or highlighting a position on the

map to create a new waypoint and conduct a GOTO.

To select a zoom scale (even while panning):

1. Press

once for each level of increase or

decrease desired.

2. Press and hold down either key to increase or

decrease by more than one scale.

To activate the pan function:

1. Press the arrow keypad in any direction, including

diagonally.

As you begin to move the map, a crosshair will

appear. This crosshair will now serve as a target marker

for the moving map. The distance and bearing from

your present position to the target crosshair will appear

in the upper corners of the map. If you are conducting

a GOTO at the time you activate the panning function,

the crosshair bearing and distance will replace the bear-

ing and distance of the GOTO waypoint.

As you pan around the map, you’ll notice that the

target crosshair will point to on-screen waypoints and

highlight the waypoint name. Once a waypoint name is

highlighted, you can review its waypoint definition page

or execute a GOTO right from the Map Page.

To review the definition page for a waypoint high-

lighted on the map:

1. Press

. The waypoint definition page will appear.

Review and make any desired changes to the high-

lighted waypoint.

2. When finished, highlight the ‘DONE?’ field and press

Map Zooming,

Panning, &

Pointing

REFERENCE

To change the map scale,

press the IN or OUT key

once for each level desired.

An on-screen window will

display the current zoom

scale.

The crosshair will “snap” to

waypoints highlighted on

the map, which allows you

to quickly review or go to

the selected waypoint right

from the Map Page.

125 Man Rev B 7/23/98 11:48 AM Page 42

To go to a waypoint highlighted on the map:

1. Press the

key. The GOTO waypoint page will

appear with the waypoint’s name highlighted.

2. Press the

key to confirm.

To stop the panning function and display your

present position:

1. Press the

key.

Using the Cursor to Mark and Go to Waypoints

During panning, the crosshair represents a target

position right on the moving map, with the range and

bearing to the target displayed at the top corners of the

screen. You can also use the target crosshair to mark a

new waypoint position or as a GOTO destination right

from the map field.

To mark the target crosshair position as a new

waypoint:

1. Press the

key to capture the position.

2. Enter a new name and route number and press

You can also use the target crosshair as an instant

GOTO destination. This function will mark and

instantly set a course for a new waypoint called ‘MAP’.

To GOTO the target crosshair:

1. Press the

key to capture the position.

2. Press the

key to confirm the MAP GOTO.

To save the MAP waypoint, rename it, as it will be

overwritten the next time a map GOTO is executed.

To mark a waypoint with

the crosshair, simply pan to

the desired position and

press the ENTER key.

REFERENCE

Using the

Cursor on the

Map

The crosshair may also be

used to define a GOTO des-

tination by panning to the

desired position and press-

ing the GOTO key. To save

the MAP waypoint, rename

it, as it will be overwritten

by the next MAP waypoint.

125 Man Rev B 7/23/98 11:48 AM Page 43

Selecting a User-Defined Navigation Page

Once you’ve selected a GOTO destination or acti-

vated a MOB or route, the GPS 125 Sounder will pro-

vide graphic steering guidance to the destination with

one of two navigation pages:

•The Highway Page (the default navigation page)

provides a graphic highway that shows your move-

ment relative to the desired course, with an

emphasis on your crosstrack error (the distance

and direction you are off course). The Highway

Page is well-suited for boating and other activities

with higher speeds and straight-line courses to a

destination.

•The Compass Page provides a directional pointer

to the destination, with a rotating compass graphic

to display your direction of travel. The Compass

Page is ideal for activities like trawling or entering

a harbor, and provides better steering guidance for

slow-speed (e.g., walking) travel with many direc-

tional changes.

Both pages provide a digital display of the bearing

and distance to the destination, along with your current

speed and track over the ground. Select the desired nav-

igation page at any time.

To select the Compass or Highway Page:

1. Press

until the current navigation page appears.

2. Press

. An on-screen box will appear, with the

navigation page not currently in use highlighted as the

default.

3. Press

to switch the navigation screen.

Highway &

Compass Pages

REFERENCE

To switch the navigation

page to the Compass Page,

press ENTER twice.

To switch the navigation

page to the Highway Page,

press ENTER twice.

125 Man Rev B 7/23/98 11:48 AM Page 44

Using the Highway Page

The GPS 125 Sounder’s Highway Page also pro-

vides graphic steering guidance to a destination, with a

greater emphasis on the straight-line desired course

and the distance and direction you are off course. The

bearing and distance to a waypoint--along with your

current track and speed--are displayed at the top of the

screen, with your digital depth, estimated time enroute

(ETE), and velocity made good (VMG, or the rate you

are closing in on your destination), at the bottom.

As you head toward your destination, the middle

section of the screen provides visual guidance to your

waypoint on a moving graphic “highway”.

Your present position is represented by the dia-

mond in the center of the course deviation scale. The

line down the middle of the highway represents your

desired track. As you navigate toward a waypoint, the

highway will actually move and indicate the direction

you are off course, relative to the position diamond on

the CDI scale. To stay on course, simply steer toward

the center of the highway.

If you do get off the desired course by more than

1/5th of the selected CDI range, the distance you are

off course will be displayed where the CDI scale setting

normally appears. If you get too far off course (the

highway has disappeared), a message box will appear

to indicate what course to steer to get back on course.

In this example, the

Highway Page indicates

that you are off course to the

left. Steer right to get back

on course. Notice the

emphasis of the Highway

Page is on the desired

course.

REFERENCE

Highway Page

If you get too far off course,

a message box will appear

to indicate what course to

steer to get back on course

most efficiently.

Bearing to

Waypoint

Graphic

Highway

CDI

Distance to

Waypoint

Estimated

Time Enroute

Velocity

Made Good

Speed Over

Ground

Track Over

Ground

Destination

Waypoint

Digital Depth

Pointer to Waypoint

125 Man Rev B 7/23/98 11:48 AM Page 45

Using the Compass Page

The GPS 125 Sounder’s Compass Page provides

graphic steering guidance to a destination waypoint.

The bearing (BRG) and distance (DST) to the waypoint

are displayed at the top of the page, below the destina-

tion waypoint field. The distance displayed is always the

straight-line distance from your present position to the

destination waypoint. The bearing indicates the exact

compass heading from you to the destination.

The middle of the page features a rotating “compass-

ring ” that shows your current heading while you’re mov-

ing (track up), with a pointer arrow to the destination, dis-

played in the center. The arrow shows the direction of

your destination from the direction you are moving. If the

arrow points up, you are going directly to the waypoint. If

the arrow points any other direction (left, right, down,

etc.), turn toward the arrow until it points up and then

continue in that direction.

The bottom of the Compass Page shows your current

track (TRK), speed (SPD) over the ground, and digital

depth (DPT).

When you are one minute away from the destination

(based on your current speed and track over the ground),

the GPS 125 Sounder will alert you with a flashing on-

screen message box.

Compass Page

REFERENCE

In this example, the

Compass Page indicates

that you are traveling in an

east (090 degrees) direction

and the destination way-

point is southeast (108

degrees) of your current

direction of travel.

In this example, the

Compass Page indicates

that you are traveling in a

southeast (139 degrees) and

the destination waypoint is

due east (109 degrees) of

your current direction of

travel.

Bearing to

Waypoint

Pointer to

Waypoint

Speed Over

Ground

Destination

Waypoint

Track Over

Ground

Distance to

Waypoint

Graphic

Compass

Digital Depth

125 Man Rev B 7/23/98 11:48 AM Page 46

Menu Page

The GPS 125 Sounder Menu Page provides access

to submenu pages used to select and customize opera-

tion and navigation setup. The 11 submenus are divid-

ed into categories by function. See pg. 21-36 for dis-

cussion of waypoint and route management submenus.

We’ll now address the rest of the submenus in the

order they appear on the Menu Page.

To select a submenu page from the Menu Page:

1. Highlight the submenu page you want to view.

2. Press the

key to display the submenu page.

3. To return to the Menu Page, press the

key.

Distance and Sun Calculation

The distance and sun calculation page will give you

the distance and bearing between any two waypoints

and will calculate the sunrise and sunset (in local time)

at a destination waypoint for a particular date.

To perform a distance and sun calculation:

1. Highlight the ‘FROM’ field and enter the desired way-

point. Press

to move to the next field.

2. Highlight the ‘TO’ field and enter the destination way-

point. Press the

key to calculate the range and

bearing to the destination waypoint.

3. Highlight ‘DATE’ and enter the date for your destina-

tion. Press

to display the sun information.

Track Log Setup Page

The track log setup page lets you manage the GPS

125 Sounder’s tracking data. From this page, you can

select whether or not to record a track and define how

it is recorded.

To turn the track log on or off:

1. Highlight the ‘RECORD’ field and press

2. Select ‘Yes’ or ‘No’ and press

. NOTE: Turning

the track recording off will prevent using TracBack.

To select a submenu, use the

UP and DOWN arrow keys

to highlight a menu option

and press ENTER.

REFERENCE

Menu Page &

Distance/Sun

Calculation

The GPS 125 Sounder will

calculate the sunrise and

sunset times of any stored

waypoint or your present

position. To calculate, enter

the date and year and press

ENTER.

125 Man Rev B 7/23/98 11:48 AM Page 47

Track Criteria

The stored track criteria determines how often posi-

tions are stored in the track log. The default setting is

automatic, which stores track based on resolution.

‘Automatic’ is the most efficient use of track memory

and provides the most accurate TracBack route.

To change the criteria to record points based

upon a specific time interval:

1. Highlight the ‘CRITERIA’ field and press

2. Use

to select ‘Time Interval’ and press

3. Press

to begin entry of the interval.

4. Enter a value in hours, minutes and seconds, and

press the

key.

Managing and Clearing the Track Log

The rest of the track log setup page displays the per-

centage of available memory currently used to store

track log data and function fields in order to clear the

track log memory and activate the TracBack feature.

To clear the track log:

1. Highlight ‘CLEAR LOG?’ and press

2. A warning page will appear, and ask you to confirm

your actions. Use the

key to move the field highlight

to the ‘Yes?’ field and press

TracBack Function

The TracBack option lets you activate a TracBack

route using the track log (see pg. 29-30 for more infor-

mation).

To activate a TracBack route:

1. Highlight the ‘TRACBACK?’ option and press

Track Log Setup

& TracBack

REFERENCE

Turning the track recording

option off will prevent you

from using the TracBack

option.

Entering a time interval in

to the track recording crite-

ria will plot your position

points further apart than

they would be in the

‘Automatic’ setting. This

will increase the distance

you can travel without

using up your track log, but

will greatly reduce the effec-

tiveness of TracBack.

125 Man Rev B 7/23/98 11:48 AM Page 48

Interface Setup

The interface setup page lets you specify the inter-

facing formats for connecting external devices. There

are five interface options: GRMN/GRMN, None/None,

None/NMEA, RTCM/None, and RTCM/NMEA. Each

option lists the input format first, followed by the out-

put format.

To select I/O format:

1. Highlight the I/O field and press

2. Use the

and

keys to toggle through and

select the desired setting, and press

The GRMN/GRMN setting is a proprietary format

that lets you exchange information such as waypoints,

routes and track logs between two GARMIN GPS

devices or a PC. During data transfer, the number of

packets being exchanged will be displayed on screen.

To select a transfer option:

1. Highlight the ‘HOST’ field and press

2. Use

and

to select a setting and press

To disable all interfacing capabilities, select the

None/None setting. If you want to output NMEA data

to compatible external devices without any differential

input capability, select the None/NMEA setting. Once a

NMEA output setting has been selected (with or with-

out RTCM input), the NMEA field will become high-

lighted. NMEA formats 0180, 0182 or 0183 (1.5 or

2.0) are available.

To select a NMEA format:

1. Press

to begin a NMEA selection.

2. Use

and

to select a format, and press

A field for additional infor-

mation will be displayed

when required for the select-

ed interface option. Above,

the None/NMEA option will

allow input of NMEA ver-

sions and a baud rate.

REFERENCE

Interface

Options

Choose a ‘HOST’ field

based upon the type of

information transfer you

want to occur between the

two interfacing devices.

125 Man Rev B 7/23/98 11:48 AM Page 49

DGPS Interface

The last two format settings allow the differential-

ready GPS 125 Sounder to accept RTCM DGPS correc-

tions in RTCM 104 version 2.0 format. Using DGPS

corrections will improve receiver accuracy to 5-10

meters, regardless of errors induced by the government’s

Selective Availability (SA) program. The RTCM/NONE

format will allow connection to any manually tuned

beacon receiver by using the proper output interface.

The baud rate is selectable from the GPS 125 Sounder.

The RTCM/NMEA selection controls the GARMIN

GBR-21 differential beacon receiver. Once a RTCM set-

ting has been selected, the GPS 125 Sounder will either

automatically try to tune the last frequency and bit rate

you selected or will switch to the default frequency of

304.0 kHz with a bit rate of 100 bps if no previous bea-

con has been tuned. You may also enter your own fre-

quency and bit rate if desired.

To enter a DGPS beacon frequency:

1. Highlight the ‘FREQ’ field and press

2. Enter the desired frequency and press

3. Highlight the ‘RATE’ field and press

4. Use

and

to select the desired transmit rate.

5. Press the

key to confirm your entry.

When the GPS 125 Sounder is receiving DGPS cor-

rections from the GBR-21, the ‘BEACON RECVR’ sec-

tion of the I/O setup page will display the beacon fre-

quency and signal strength, as well as the distance from

the transmitter to the beacon receiver. At the bottom of

the beacon receiver field, a status message will keep you

informed of DGPS activity:

• A ‘Tuning’ message will be displayed while a bea-

con signal is being tuned.

• Once the beacon signal has been tuned, a

‘Receiving’ message will be displayed.

• If a beacon signal is tuned and no corrections are

being received, a ‘No Data’ message will be dis-

played.

• If a beacon signal cannot be tuned, a ‘No Status’

message will be displayed.

DGPS Interface

REFERENCE

The selectable baud rate is

available for all RTCM

interface options.

Once a RTCM option is

selected, you must manual-

ly tune the beacon receiver

from the frequency field.

125 Man Rev B 7/23/98 11:48 AM Page 50

The GPS 125 Sounder will also display one of three

alert messages concerning DGPS operation through the

message page:

No DGPS Position— not enough data is available

to compute a DGPS position.

No RTCM Input— the beacon receiver is not

properly connected or the baud rates do not

match.

RTCM Input Failed— DGPS data was being

received but has been lost.

System Setup

The first setup page is the system setup page,

which is used to select the operating mode, time offset

and screen preferences. The GPS 125 Sounder has four

operating modes:

• ’Normal’ Mode is the mode used for actual

navigation. Satellite data is acquired and used in

figuring and displaying your position and

movement.

• ’Simulator’ Mode allows you to operate the unit

without acquiring satellites, and is ideal for prac-

ticing or entering waypoints and routes while at

home.

• ’GPS Only’ Mode does not display any informa-

tion on the Sounder Page. This is useful when

using the unit for land navigation while enroute

to the water.

• ’Sounder Only’ Mode will not display GPS

information (such as position, speed, heading,

and map functions).

To select an operating mode:

1. Highlight the ‘MODE’ field and press

2. Use the arrow keypad to select a mode and press

Alert messages will signal

any problems with DGPS

operation.

REFERENCE

DGPS Interface

& System Setup

The GPS 125 Sounders four

operating modes are

accessed through the system

setup submenu.

125 Man Rev B 7/23/98 11:48 AM Page 51

Date and Time Setup

The date and time field is located directly below the

mode field. Because the time shown is UTC time, you

will need to enter a time offset to display the correct

local time for your area. To determine the time offset for

your area, note your position and refer to the chart in

Appendix C.

To enter the time offset:

1. Highlight the ‘OFFSET’ field and press the

key.

2. Enter the time offset and press

. Remember to

select a positive or negative indicator for your offset.

Time Format

The time display shown on the system setup and

Position Pages may be set to display the time in a 12 or

24-hour format.

To select the time format:

1. Highlight the ‘HOURS’ field and press the

key.

2. Select 12-or 24-hour display, and press

confirm.

Screen Contrast

The GPS 125 Sounder has adjustable screen con-

trast that is controlled by using an on-screen bar scale.

To set the screen contrast:

1. Move the field highlight to the ‘CONTRAST’ field and

press the

key.

2. Use the

and

keys to adjust the bar scale for the

desired contrast and press the

key.

Tone Setting

You may choose from three settings for audible

tone: messages only, messages and keystrokes, or no

tone at all.

To specify a tone setting:

1. Highlight the ‘TONE’ field and press the

key.

2. Use the

and

keys to select the desired tone

and press

Setting Time,

Screen Contrast,

& Tone

REFERENCE

To display the correct local

time, you must enter the

appropriate offset from the

chart at the end of

Appendix C.

Screen contrast may be

adjusted with the contrast

bar.

125 Man Rev B 7/23/98 11:48 AM Page 52

Navigation Setup

The navigation setup page is used to select units of

measurement for position format, map datum, CDI

scale, and distance, speed, and heading information.

Position Formats

The default position setting for the GPS 125

Sounder is latitude and longitude in degrees and min-

utes (hdddºmm.mmm’). You may also select degrees,

minutes and seconds (hdddºmm’ss.s’’); degrees only

(hddd.dddddº); UTM/UPS coordinates; or British,

German, Irish, Maidenhead, Swedish, Swiss, or Taiwan

grid formats.

To select a position format:

1. Highlight the ‘POSITION FRMT’ field and press

2. Use the

and

keys to select the desired set-

ting. Confirm the setting by pressing

Map Datums

The map datum field is located just below the posi-

tion format field, and comes with a WGS 84 default

setting. Although 104 total map datums are available

for use (see the map datum listing in Appendix D), you

should only change the datum if you are using maps or

charts that specify a different datum than WGS 84.

To select a map datum:

1. Highlight the ‘MAP DATUM’ field and press

2. Use the

and

keys to toggle through and

select the desired setting. Confirm the setting by

pressing

CDI Scale Settings

The course deviation indicator (CDI) scale defini-

tion field lets you select the +/- range of the CDI bar

scale. Three scales are available: +/- 0.25, 1.25 and 5.0

miles or kilometers, with 0.25 being the default setting.

To enter a CDI scale setting:

1. Highlight the ‘CDI SCALE’ field and press

2. Use

and

to select the desired setting and

press

The position format may be

set to display your choice of

many formats. Note: degree

and minutes is the default

setting.

REFERENCE

Navigation

Setup

Adjusting the CDI Scale will

determine the value used in

the Highway Page and for

the range rings on the Map

Page (if displayed).

125 Man Rev B 7/23/98 11:48 AM Page 53

Units of Measure

The GPS 125 Sounder lets you select nautical

(default), statute, or metric units of measure for all

speed and distance fields.

To change the unit of measure:

1. Highlight the ‘UNITS’ field and press the

key.

2. Use

and

to select the desired unit of

measure.

3. Press the

key to confirm the selection.

Speed Filter

The speed filter allows you to determine how the

GPS 125 Sounder responds to changes in track or

ground speed. Three settings are available: Auto, On, or

Off. The ‘Auto’ setting is the default and will monitor

the changes in your current track and speed and adjust

the receiver’s response time automatically. The ‘On’ set-

ting allows you to manually enter a response time up to

300 seconds. Selecting a higher setting may be desirable

in slow-speed applications with frequent changes in

track.

To enter a value for the speed filter:

1. Highlight the ‘SPEED FILTER’ field and press

2. Select the ‘ON’ option and press

3. Highlight the “speed value” field and press

4. Select the desired number of seconds and press

Navigation &

Speed Filter

REFERENCE

Choose a navigation unit

you are familiar with or

that may be appropriate to

the situation in which the

GPS 125 Sounder is used.

The number entered repre-

sents a window of time the

GPS 125 Sounder considers

in adjusting to changes in

speed and track. For exam-

ple, if 12 seconds is entered,

the speed displayed will

constantly represent the

speed averaged over the last

12 seconds.

125 Man Rev B 7/23/98 11:48 AM Page 54

Magnetic Heading Reference

The GPS 125 Sounder’s heading information can be

displayed referencing magnetic north (auto or user-

defined), true north, or calculated grid headings. The

default setting is automatic magnetic north, which is

suitable for most applications.

To select a heading reference:

1. Highlight the ‘HEADING’ field and press

2. Select the desired heading preference.

3. Press the

key to confirm the selection.

To enter a user-defined magnetic heading

. 1. Select the ‘USER MAG’ option and press

2. Use the

and

keys to enter the degrees

and direction of magnetic variation.

3. Press the

key to confirm the magnetic

variation value.

Map Setup and Orientation

The map setup page lets you select map orientation

and specify what items are displayed. The map may be

oriented to north up, the direction of current travel

(track up) or the direction of an active route leg

(desired track up). The default setting is track up.

To change the map orientation:

1. Highlight the ‘ORIENTATION’ field and press

2. Use the

and

keys to toggle through and

select the desired setting, and press

The ‘North Up” orientation

causes the top-center of the

Map Page to represent

000º, the right-center to be

090º, the bottom-center

180º, and the left-center to

be 270º.

REFERENCE

Magnetic

Heading & Map

Setup

To enter a user-defined

magnetic variation, select

the ‘User Mag’ option and

enter the desired direction

and value.

125 Man Rev B 7/23/98 11:48 AM Page 55

Selecting Displayed Items on the Map Page

The rest of the map setup page lets you specify what

items are displayed or plotted on the Map Page. The

first four plot items may be turned on or off by selecting

‘Yes’ or ‘No’ in the appropriate field:

• The ‘RINGS’ selection will display the three pre-

sent position range rings on the map.

• The ‘ROUTE’ selection will plot the straight leg

lines between waypoints of an active route and

display all route waypoint names.

• The ‘NEAREST’ selection will show the nine near-

est waypoints to your present position (not the

target crosshair on the map).

• The ‘NAMES’ selection will display the waypoint

name for the nine nearest waypoints.

To turn a plotted item on or off:

1. Highlight the confirmation (Yes or No) field for the plot-

ted item and press

. Make your desired selection

and press

Track Log Display

The track log option sets the number of points the

unit will attempt to display on the Map Page. The

default setting of 250 points provides good resolution

with minimal screen clutter. The maximum setting is

768 points. Once you’ve reached the maximum number

of track points, the older points will be lost as new

points are added. Adjusting the track points displayed

will not affect whether or not the receiver records a

track log or the ability to create a TracBack route.

To enter a log setting:

1. Highlight to the ‘TRACK LOG’ field and press

2. Enter a value in the 3-digit field and press

. If you

do not want to display a track, enter ‘000’.

Map Setup

REFERENCE

A higher track log value will

make a more detailed track

log but will take up more

memory.

On-screen range rings will

appear on the map when

the ‘RINGS’ option is set to

the ‘Yes’ position.

125 Man Rev B 7/23/98 11:48 AM Page 56

Alarms Setup

The GPS 125 Sounder’s alarms setup page is used

to set the three available alarms: the anchor drag alarm,

arrival alarm, and CDI alarm.

The anchor drag alarm will sound if your boat has

moved outside a range measured from a central point

(your position). The arrival alarm sounds when you are

approaching a waypoint and have reached the user-

defined distance. The CDI alarm will alert you when

your track varies from the shortest distance to a way-

point by the defined range.

To set the alarms:

1. Highlight ‘ALARMS SETUP’ and press

2. Select the desired alarm distance field and press

3. Enter the distance for the alarm and press

4. If you would like to change the ‘On/Off’ setting, press

the

key and use the

keys to turn

the alarm on or off.

5. Enter a setting and and press

When setting the anchor drag alarm, remem-

ber that Selective Availability can degrade

your GPS position as much as 100 meters and

may cause false anchor drag alerts.

REFERENCE

Alarms Setup

The arrival alarm will

sound at the determined

distance from the destina-

tion waypoint.

Use the anchor drag alarm

as an indicator of move-

ment due to possible anchor

slippage.

125 Man Rev B 7/23/98 11:48 AM Page 57

Sounder Setup

The sounder setup page lets you customize the

sounder to your needs and activate certain alarms.

Access the Sounder Setup from the Menu Page.

Sensitivity

The sensitivity setting determines how sensitive the

sounder is to sonar echoes. High sensitivity may show

clutter which can conceal fish, while low sensitivity may

not show all fish. Note: A setting of 50% will give you

the best results for most fishing situations.

To adjust sensitivity:

1. Highlight ‘SENSITIVITY?’ and press

. The Sounder

Page will appear with ‘SENS’ and a value displayed in

the upper left corner of the page.

2. Press the arrow keypad up or down until the desired

sensitivity level is shown and press

Chart Speed

The chart speed field allows you to select the speed

at which the sonar display scrolls across the screen.

To adjust chart speed:

1. Highlight ‘CHART SPD?’ and press

. The Sounder

Page will appear with ‘SPD’ and a value displayed in

the upper left corner of the page.

2. Press the arrow keypad up or down until the desired

chart speed is shown and press

Sounder Setup

REFERENCE

Adjust the sensitivity range

between 0 and 100. The

default setting is 50.

The chart speed may be

adjusted between 10 (slow-

est) and 100. The default is

100.

125 Man Rev B 7/23/98 11:48 AM Page 58

Whiteline

You may select how the area of strongest sonar

return is shown through the whiteline setting. A high

setting will cause a thick whiteline while low settings

show a thin whiteline.

To adjust the whiteline:

1. Highlight ‘WHITELINE?’ and press

. The Sounder

Page will appear with ‘WTLN’ and a value displayed

in the upper-left corner of the page.

2. Press the arrow keypad up or down until the desired

whiteline level is shown and press

Range Mode

You may select the range mode from this menu.

To select the auto or manual range mode:

1. Highlight the ‘RNG MODE’ field and press

. The

Manual/Auto field will be highlighted.

2. Press the arrow keypad up or down until the desired

range mode is shown and press

Fish ID

The Fish ID setting determines how the GPS 125

Sounder identifies and labels sonar targets on the

screen. Three settings are available:

• OFF - is the default setting and shows all sonar

target information in its unprocessed form.

• ON - shows small, medium, and large fish icons,

along with each target’s depth. Other echo informa-

tion (thermoclines, thin stumps, etc.) is shown as a

dotted pattern.

• FISH - shows fish icons and depth and does not

show other echo information.

To select Fish ID:

1. Highlight the ‘FISH ID’ field and press

. ‘ON/OFF’

will be highlighted.

2. Select the desired setting and press

REFERENCE

Whiteline &

Fish ID

The whiteline may be

adjusted from 0 (off) to 100.

The default setting is 5.

The ‘OFF’ setting is the Fish

ID default and will show

sonar targets as arches.

125 Man Rev B 7/23/98 11:48 AM Page 59

The above examples illustrate the difference

between having Fish ID set to “FISH” versus “ON”. The

most information is available with the “ON” setting.

Noise Rejection

The noise rejection setting determines how much

the unit screens out electronic interference from nearby

equipment. The “Auto” setting is the default and will

turn noise rejection on and off as needed.

To set noise rejection:

1. Highlight the ‘NOISE REJ’ field and press

. The

AUTO/ON/OFF field will be highlighted.

2. Press the arrow keypad up or down until the desired

mode is shown and press

Depth Units

The depth units field allows you to determine

whether sounder depth is displayed in feet, meters, or

fathoms.

To set the depth units:

1. Highlight ‘UNITS’ and press

. The

‘FEET/METERS/FATHOM’ field will be highlighted.

2. Press the arrow keypad up or down until the desired

depth unit is shown and press

Noise Rejection

& Depth Units

REFERENCE

ID Setting - FISH ID Setting - ON

Use the noise rejection fea-

ture to minimize interfer-

ence from nearby

electronics.

Choose a desired unit of

measurement from feet,

meters, or fathoms.

125 Man Rev B 7/23/98 11:48 AM Page 60

Keel Offset

This setting allows you to set the point from which

the GPS 125 Sounder will measure depth. This makes

it possible to measure depth from the bottom of the

keel instead of from the transducer’s location. A posi-

tive number will measure depth from a deeper point

while a negative number reflects a shallower point.

To set keel offset:

1. Highlight the ‘KEEL’ field and press

. The value

field will be highlighted.

2. Select plus (+) or minus (-) and press

. The high-

light will move to the value field.

3. Enter the desired offset value using the arrow keypad

and press

Sounder Alarms

This field allows you to set shallow and deep depth

alarms and an alarm for specific-sized fish/targets Three

options are available:

• Shallow water - Has an on/off setting and a depth

value field

• Deep water - Has an on/off setting and a depth

value field

• Fish - Has an on/off setting and a

medium/large/all size field

To set a sounder alarm:

1. Highlight the desired alarm and press

. The on/off

setting will be highlighted.

2. Use the arrow keypad to select ‘ON’ or ‘OFF’ and

press

. The highlight will move to the value field.

3. Enter the desired value using the arrow keypad and

press

REFERENCE

Keel Offset &

Sounder Alarms

The alarms can be set to

activate at a specified shal-

low and deep water depth

and when any sonar targets

appear.

Use the keel offset to cus-

tomize the point used to

measure depth.

125 Man Rev B 7/23/98 11:48 AM Page 61

Nav Simulator

REFERENCE

Navigation Simulator

The GPS 125 Sounder’s simulator mode lets you

practice all aspects of operation without actually track-

ing satellites. You can also plan and practice trips, enter

new waypoints and routes, and save them for use dur-

ing normal operation. The simulator is activated from

the system setup page, with speed and heading con-

trolled from the Position, Compass, or Highway Pages.

To activate the simulator:

1. Highlight ‘SYSTEM SETUP’ and press

2. Highlight the ‘MODE’ field and press

3. Use

to select the simulator mode.

4. Press the

key to confirm.

5. Press

to return to the Menu Page.

125 Man Rev B 7/23/98 11:48 AM Page 62

REFERENCE

Nav Simulator

Once the simulator mode has been activated, use

the Position, Compass, or Highway Page to set your

speed, track and simulated depth.

To enter track, speed, position, and depth:

1. Highlight the ‘TRACK’ field and press the

key.

2. Enter a track and press

3. Highlight the ‘SPEED’ field and press

4. Enter a speed and press

5. Highlight the ‘POS’ field and press

6. Enter a position and press the

key.

7. Highlight the ‘DPT’ field and press

8. Enter a depth and press the

key.

The GPS 125 Sounder does not track satellites

or receive sonar signals in simulator mode.

Although you can create and save waypoints

and routes while using the simulator mode,

never attempt to use the simulator mode for

actual navigation or fishing/depth sounding.

125 Man Rev B 7/23/98 11:48 AM Page 63

Installation

The GPS 125 Sounder must be properly installed

according to the following instructions to get the best

possible performance.

To begin installation, you’ll need to select a suitable

mounting position for the antenna, unit and transducer

(see right). Once you’ve identified the best mounting

location, install the antenna, transducer, and cable first,

and then the unit and wiring harness.

Choosing an Antenna Location

The antenna should be mounted in a location that

has a clear, unobstructed view of the sky in all direc-

tions to ensure the best reception in all conditions.

Avoid mounting the antenna where it will be shaded by

the boat’s superstructure, a radome antenna, or mast.

Most marine VHF and loran antennas will not seriously

degrade the GPS antenna’s reception. Never paint the

antenna or clean it with harsh solvents.

APPENDIX A

Installation

Typical Bass Boat Installation

125 Man Rev B 7/23/98 11:48 AM Page 64

Two types of antenna assemblies are used with the

GPS 125 Sounder:

• White, GA28 Marine Antenna with 30 ft. cable

and BNC connector

• Black, GA26 Low-Profile Antenna with 8 ft.

cable, BNC connector, flange, and Velcro™

mounting hardware.

Mounting the White, GA28 Antenna

To install the GA28 antenna:

1. Attach a 1” X 14 mount (not included) to the desired

antenna location using the appropriate fasteners.

2. Screw the antenna directly onto the 1” X 14 mount.

3. Route the cable to the location of the GPS 125 Sounder,

using the appropriate tie-wraps,escutcheon plates, and

sealant to secure the cable along the route and through

any bulkhead or deck.

4. Once the GPS 125 Sounder unit has been installed, con-

nect the cable to the antenna connector on the back of

the unit. Turn the antenna connector 1/4 turn clockwise

to lock the cable into place.

APPENDIX A

Installation

Transducer Installation:

For instructions on transduc-

er installation, see the

booklet included with your

transducer.

125 Man Rev B 7/23/98 11:48 AM Page 65

Mounting the GPS 125 Sounder

Two types of mounting options are included with

the GA26:

• Flange Mount Bracket

• Dual-Lock Velcro Strips

The flange mount bracket is useful for permanent

antenna mounting on a flat surface.

The dual-lock Velcro should be considered perma-

nent even though it does not require drilling. The adhe-

sive used to attach the Velcro to the antenna and the

mounting surface is very strong. Removing an item

attached with dual-lock Velcro could result in damage

to the antenna or to the mounting surface.

To flange mount the GA26 antenna:

1. Attach the flange mount bracket to the GA26 using the

two M3 screws included with the antenna.

Installation

APPENDIX A

125 Man Rev B 7/23/98 11:48 AM Page 66

Mounting the GA 26 Antenna (cont.)

2. Using the mounting bracket as a template, mark and then

drill four 0.115-.125” holes.

3. If necessary, apply silicone sealant between the mount-

ing surface and flange mount and then attach the anten-

na to the mounting surface with appropriate screw (not

included).

4. Note: If installation requires that the antenna cable be rout-

ed through the mounting surface, you will need to make a

0.700” cable hole in the mounting surface.

To Velcro mount the GA26 antenna:

1. Ensure the mounting surface and the back of the GA26

antenna are both clean.

2. Remove the backing from each of the Velcro strips,

attach them to the desired locations, and press the

antenna onto the mounting surface.

Mounting the GPS 125 Sounder

The GARMIN GPS 125 Sounder’s compact case is

suitable for mounting in exposed locations or at the

nav station. The unit comes with a gimbal bracket that

can be used for surface, overhead, or flush mounting.

When choosing a location for the display unit, make

sure you consider the following conditions:

APPENDIX A

Installation

125 Man Rev B 7/23/98 11:48 AM Page 67

Mounting the GPS 125 Sounder (cont.)

• There should be at least 2.00” (5.0 cm) clearance

behind the case to allow connection of the anten-

na, power/data cable, and transducer cable.

• The mounting surface should be rigid enough to

support the unit and protect it from excessive

vibration and shock.

• The GPS 125 Sounder screen has crisp contrast in

most lighting conditions, even full sunlight.

To surface mount the GPS 125 Sounder:

1. Place the mounting bracket in the desired location.

2. Mark and drill the four mounting holes for the fasten-

ers you are using.

3. Fasten the bracket to the surface using the appropri-

ate fasteners.

4. Insert the GPS 125 Sounder into the mounting bracket.

5. Screw the two mounting knobs through the bracket

and into the GPS 125 Sounder.

6. Connect the power/data, antenna, and transducer

cables to the back of the unit, making sure the locking

rings are fully tightened on both connectors.

Installation

APPENDIX A

WARNING

If your power source ever

exceeds 18 volts, the above

warning page will appear.

The GPS 125 Sounder will

automatically discontinue

standard operation to

avoid system overload and

will allow only screen

backlighting operation.

Should this warning

appear, you should check

your power source and

reduce voltage to the unit

to between 12 and 18

volts.

125 Man Rev B 7/23/98 11:48 AM Page 68

To flush mount the GPS 125 Sounder:

The GPS 125 Sounder can be mounted flush with a

flat panel of .08-.52” thickness using the cam lobe fea-

ture on its mounting bracket.

1. Cut a 4.15” W x 4.67” H hole in panel.

2. Place GPS 125 Sounder into hole from the front until

its flange rests against the mounting surface.

3. From the back side of the panel, loosely attach the

bracket such that the slot in the ratchet area points

away from the mounting panel.

4. Rotate the bracket downward until the panel

is pinched tightly between the units flange

and bracket lobe.

5. Tighten knobs and connect the power/data, antenna,

and transducer cables.

APPENDIX A

Installation

125 Man Rev B 7/23/98 11:48 AM Page 69

Wiring &

Specifications

APPENDIX B

Connecting the power/data cable

The power/data cable connects the GPS 125 Sounder

system to a 12-18 volt DC power source and provides

interface capabilities for connecting NMEA devices and

an external alarm (see below for interface operation

details). The diagram below indicates the appropriate har-

ness connections.

To connect the GPS 125 Sounder to a power source:

1. Connect the RED harness lead to the positive side of a 12-18 volt DC power source. Make sure

the power lead has an in-line 1-amp fuse installed.

2. Connect the BLACK harness lead to a ground strip or the negative side of a

12-18 volt DC power source.

To connect an external alarm, connect the ground side of the alarm device to the

YELLOW harness lead. (100 mA DC load max.) The following interface formats are sup-

ported by the GPS 125 Sounder for driving three NMEA devices:

NMEA 0180, NMEA 0182,

NMEA 0183 version 1.5:

Approved sentences:

GPBWC, GPGLL, GPRMB, GPRMC,

GPXTE, GPVTG, GPWPL

Proprietary sentences:

PGRMM (map datum), PGRMZ

(altitude), PSLIB (beacon rec. control)

NMEA 0183 version 2.0:

Approved sentences:

GPGGA, GPGLL, GPGSA, GPGSV,

GPRMB, GPRMC, GPRTE, GPWPL

Proprietary sentences:

PGRME (estimated error), PGRMM

(map datum), PGRMZ (altitude), PSLIB

(beacon receiver control)

PIN 1 (red): 12-18 volts DC

PIN 2 (black): Ground

PIN 3 (blue): NMEA out

PIN 4 (brown): NMEA in

PIN 5 (white): No connection

PIN 6 (green): No connection

PIN 7 (yellow): alarm low

345

Pin assignment

(-) (+)

12-18 volts DC

Autopilot/

NMEA Device

GBR 21

Beacon

Receiver

Alarm/

Relay

(-)

Shield Grounded

Through GPS

(+)

125 Man Rev B 7/23/98 11:48 AM Page 70

APPENDIX B

Wiring &

Specifications

PHYSICAL

Case: gasketed-construction

Size: 4.9”H x 5.3”W x 2.4”D

(15.6 x 5.1 x 1.23 cm)

Weight: Less than 1 lb. (454g)

Temperature Range: 5º to 158ºF (-15º to 70ºC)

PERFORMANCE

Receiver: Differential-ready MultiTrac8

Acquisition Time: Approx. 20 seconds (warm)

Approx. 2 minutes (cold)

Approx. 7.5 minutes (AutoLocate

)

Update Rate: 1/second, continuous

Position Accuracy: 5-10 meters (16-33 ft.) with DGPS corrections*

15 meters (49 ft.) RMS**

Velocity Accuracy: 0.1 knot RMS steady state, 99 knots max.

Dynamics: Performs specification to 3g’s

POWER

Input: 12-18v DC

Usage: 5 watts

Specifications subject to change without notice

* With optional GARMIN GBR 21 Beacon Receiver Input.

** Subject to accuracy degradation to 100m 2DRMS under the US DOD-imposed elective

Availability Program.

The GPS 125 Sounder is constructed of high-quality

materials and should not require user maintenance. Should

your unit ever need repair, please take it to an authorized

GARMIN service center. The GPS 125 Sounder has no

user-serviceable parts. Never attempt any repairs yourself.

To protect your GPS, never allow gasoline or other sol-

vents to come in contact with the case or screen. Clean the

case and screen with a soft cloth and a household window

cleaner.

125 Man Rev B 7/23/98 11:48 AM Page 71

Messages &

Time Offsets

APPENDIX C

Active WPT Can’t be Deleted—You have attempted to change the “active to”’ or “active from”

waypoint. Clear the active route or GOTO before making your changes.

Accuracy has been Degraded—The accuracy of the GPS 125 Sounder has been degraded

beyond 500 meters due to poor satellite geometry or data quality. You should check other navi-

gational sources to verify the position indicated.

Already Exists—The name you are entering already exists in the GPS 125 Sounder’s memory.

Approaching—You are one minute away from reaching a destination waypoint.

Deep Water Alarm—The current depth is equal to or more than the set alarm depth.

No DGPS Position—Not enough data is available to compute a DGPS position.

No RTCM Input—

Beacon receiver is improperly connected or baud rates do not match.

Poor GPS Coverage—The GPS 125 Sounder cannot acquire the necessary number of satellites

to compute a position. Try another location with a clearer view of the sky.

Power Down and Re-init—The GPS 125 Sounder is not able to calculate a position due to

abnormal satellite conditions. Turn the unit off and verify the last position shown by other

means. Try the unit again later, possibly in a different location.

Read Only Mem has Failed—The permanent memory has failed and the unit is not operable.

Take your unit to an authorized GARMIN dealer for repairs.

Received an Invalid WPT—A waypoint was received during upload transfer that has an invalid

identifier.

Receiver has Failed—A failure in receiver hardware has been detected. If this message persists,

do not use the unit and take it to an authorized dealer for repair.

Route is Full—You have attempted to add more than 30 waypoints to a route.

Route is not Empty—You have attempted to copy into a route already in use.

Route Waypoint Can’t be Deleted—The waypoint you are trying to delete is part of a route.

Delete the waypoint from the route before removing it from memory.

Route Waypoint was Deleted—A route waypoint entered does not exist in the database and

has been deleted from the route.

RTCM Input has Failed—DGPS data being received has been lost. You are no longer receiving

the beacon signal.

Route Waypoint was Deleted—A route waypoint entered does not exist in the database and

has been deleted from the route.

The GPS 125 Sounder uses a flashing on-screen mes-

sage to alert you to important information. Whenever the

message indicator appears, press the PAGE key to view the

message page. There are two types of messages: temporary

alerts and condition alerts. Temporary alerts are cleared

from the message page after viewing, while condition alerts

remain on the message page until the condition has been

resolved. Pay careful attention to all messages for your

own safety.

125 Man Rev B 7/23/98 11:48 AM Page 72

Longitudinal Zone Offset Longitudinal Zone Offset

W180.0º to W172.5º -12 E007.5º to E022.5º 1

W172.5º to W157.5º -11 E022.5º to E037.5º 2

W157.5º to W142.5º -10 E037.5º to E052.5º 3

W142.5º to W127.5º -9 E052.5º to E067.5º 4

W127.5º to W112.5º -8 E067.5º to E082.5º 5

W112.5º to W097.5º -7 E082.5º to E097.5º 6

W097.5º to W082.5º -6 E097.5º to E112.5º 7

W082.5º to W067.5º -5 E112.5º to E127.5º 8

W067.5º to W052.5º -4 E127.5º to E142.5º 9

W052.5º to W037.5º -3 E142.5º to E157.5º 10

W037.5º to W022.5º -2 E157.5º to E172.5º 11

W022.5º to W007.5º -1 E172.5º to E180.0º 12

W007.5º to E007.5º 0

RTCM Input has Failed—DGPS data being received has been lost. You are no longer receiving

the beacon signal.

Searching the Sky—The GPS 125 Sounder is in searching the sky for almanac data or the unit

is in AutoLocate

mode.

Shallow Water Alarm—The depth is equal to or less than the set alarm depth

Sonar ASIC has Failed—The unit’s internal monitoring system indicates a malfunction. Send in

for service as soon as possible.

Stored Data was Lost—All waypoints, routes, time and almanac data has been lost due to bat-

tery failure or clearing the receiver’s memory.

Transfer has been Completed—The receiver is finished uploading or downloading information

to the connected device.

No Transducer-Sounder Off—The transducer signal is not reaching the unit because of a loose

connector, bad wiring, or transducer malfunction.

WPT Memory is Full—You have used all 250 waypoints in the GPS 125 Sounder. Delete

unwanted waypoints to make room for new entries.

The chart below gives the UTC time offset for the various longitudinal zones. If

you are in daylight savings time, add one hour to the offset.

APPENDIX C

Messages &

Time Offsets

125 Man Rev B 7/23/98 11:48 AM Page 73

Map Datums

APPENDIX D

The following list shows the 104 map datums

available for the GPS 125 Sounder. Abbreviations

are listed first, followed by the corresponding

map datum name and area.

Adindan Adindan- Ethiopia, Mali,

Senegal, Sudan

Afgooye Afgooye- Somalia

AIN EL ABD ‘70 AIN EL ANBD 1970-

Bahrain Island, Saudi Arabia

Anna 1 Ast ‘65 Anna 1 Astro ‘65- Cocos Isl.

ARC 1950 ARC 1950- Botswana,

Lesotho, Malawi, Swaziland,

Zaire, Zambia, Zimbabwe

ARC 1960 ARC 1960- Kenya, Tanzania

Ascnsn Isld ‘58 Ascension Island ‘58-

Ascension Island

Astro B4 Sorol Astro B4 Sorol Atoll- Tern

Island

Astro Bcn “E” Astro Beacon “E”- Iwo Jima

Astro Dos 71/4 Astro Dos 71/4- St. Helena

Astr Stn ‘52 Astronomic Stn ‘52- Marcus

Island

Astrln Geod ‘66 Australian Geod ‘66-

Australia, Tasmania Island

Astrln Geod ‘84 Australian Geod ‘84-

Australia, Tasmania Island

Bellevue (IGN) Efate and Erromango Islands

Bermuda 1957 Bermuda 1957- Bermuda

Islands

Bogata Observ Bogata Obsrvatry- Colombia

Campo Inchspe Campo Inchauspe- Argentina

Canton Ast ‘66 Canton Astro 1966- Phoenix

Islands

Cape Cape- South Africa

Cape Canavrl Cape Canaveral- Florida,

Bahama Islands

Carthage Carthage- Tunisia

CH-1903 CH 1903- Switzerland

Chatham 1971 Chatham 1971- Chatham

Island (New Zealand)

Chua Astro Chua Astro- Paraguay

Corrego Alegr Corrego Alegre- Brazil

Djakarta Djakarta (Batavia)- Sumatra

Island (Indonesia)

Dos 1968 Dos 1968- Gizo Island

(New Georgia Islands)

Easter Isld 67 Easter Island 1967

European 1950 European 1950- Austria,

Belgium, Denmark, Finland,

France, Germany, Gibraltar,

Greece, Italy, Luxembourg,

Netherlands, Norway,

Portugal, Spain, Sweden,

Switzerland

125 Man Rev B 7/23/98 11:49 AM Page 74

APPENDIX D

Map Datums

European 1979 European 1979- Austria,

Finland, Netherlands,

Norway, Spain, Sweden,

Switzerland

Finland Hayfrd Finland Hayford-

Finland

Gandajika Base Gandajika Base- Republic

of Maldives

Geod Datm ‘49 Geodetic Datum ‘49-

New Zealand

Guam 1963 Guam 1963-

Guam Island

Gux 1 Astro Gux 1 Astro-

Guadalcanal Island

Hjorsey 1955 Hjorsey 1955- Iceland

Hong Kong ‘63 Hong Kong ‘63-

Hong Kong

Hu-Tzu-Shan Hu-Tzu-Shan- Taiwan

Indian Bngldsh Indian- Bangladesh,

India, Nepal

Indian Thailand Indian- Thailand,

Vietnam

Indonesia ‘74 Indonesia 1974-

Indonesia

Ireland 1965 Ireland 1965- Ireland

ISTS 073 Astro ISTS 073 ASTRO ‘69-

Diego Garcia

Johnston Island Johnston Island

Kandawala Kandawala-

Sri Lanka

Kerguelen Islnd Kerguelen Island

Kertau 1948 Kertau 1948- West

Malaysia, Singapore

L. C. 5 Astro Cayman Brac Island

Liberia 1964 Liberia 1964- Liberia

Luzon Mindanao Luzon- Mindanao Island

Luzon Philippine Luzon- Philippines

(excluding Mindanao

Island)

Mahe 1971 Mahe 1971- Mahe Island

Marco Astro Marco Astro- Salvage

Island

Massawa Massawa- Eritrea

(Ethiopia)

Merchich Merchich- Morocco

Midway Ast ‘61 Midway Astro ‘61-

Midway

Minna Minna- Nigeria

NAD27 Alaska North American 1927-

Alaska

NAD27 Bahamas North American 1927-

Bahamas (excluding San

Salvador Island)

NAD27 Canada North American 1927-

Canada and

Newfoundland

NAD27 Canal Zone North Am. 1927- Canal

Zone

NAD27 Caribbn North American 1927-

Caribbean (Barbados,

Caicos Islands, Cuba,

Dom. Rep., Grand

Cayman, Jamaica,

Leeward and Turks

Islands)

NAD27 Central North American 1927-

Central America (Belize,

Costa Rica,

El Salvador, Guatemala,

Honduras, Nicaragua)

NAD27 CONUS North Am. 1927- Mean

Value (CONUS)

NAD27 Cuba North American 1927-

Cuba

NAD27 Grnland North American 1927-

Greenland

(HayesPeninsula)

NAD27 Mexico N. American 1927-

Mexico

NAD27 San Sal North American 1927-

San Salvador Island

NAD83 North American 1983-

Alaska, Canada, Central

America, CONUS,

Mexico

125 Man Rev B 7/23/98 11:49 AM Page 75

Map Datums

APPENDIX D

Nhrwn Masirah Nahrwn- Masirah Island

(Oman)

Nhrwn Saudi A Nahrwn- Saudi Arabia

Nhrwn United A Nahrwn- United Arab

Emirates

Naparima BWI Naparima BWI- Trinidad

and Tobago

Obsrvtorio ‘66 Observatorio 1966-

Corvo and Flores Islands

(Azores)

Old Egyptian Old Egyptian- Egypt

Old Hawaiian Old Hawaiian- Mean

Value

Oman Oman- Oman

Ord Srvy GB Old Survey Grt Britn-

England, Isle of Man,

Scotland, Shetland Isl.,

Wales

Pico De Las Nv Canary Islands

Ptcairn Ast ‘67 Pitcairn Astro ‘67-

Pitcairn Isl.

Prov S Am ‘56 Prov So Amricn ‘56-

Bolivia, Chile,Colombia,

Ecuador, Guyana, Peru,

Venezuela

Prov S Chln ‘63 Prov So Chilean ‘63- S.

Chile

Puerto Rico Puerto Rico & Virgin

Islands

Qatar National Qatar National- Qatar

Qornoq Qornoq- South

Greenland

Reunion Reunion- Mascarene

Island

Rome 1940 Rome 1940- Sardinia

Island

RT 90 Sweden

Santo (Dos) Santo (Dos)- Espirito

Santo Island

Sao Braz Sao Braz- Sao Miguel,

Santa Maria Islands

(Azores)

Sapper Hill ‘43 Sapper Hill 1943- East

Falkland Island

Schwarzeck Schwarzeck- Namibia

Sth Amrcn ‘69 South American ‘69-

Argentina, Bolivia, Brazil,

Chile, Colombia,

Ecuador, Guyana,

Paraguay, Peru,

Venezuela, Trinidad and

Tobago

South Asia South Asia- Singapore

SE Base Southeast Base- Porto

Santo and Madiera

Islands

SW Base Southwest Base- Faial,

Graciosa, Pico, Sao Jorge

and Terceira Islands

(Azores)

Timbalai 1948 Timbalai 1948- Brunei

and E. Malaysia (Sarawak

and Sabah)

Tokyo Tokyo- Japan, Korea,

Okinawa

Tristan Ast ‘68 Tristan Astro 1968-

Tristan da Cunha

Viti Levu 1916 Viti Levu 1916- Viti

Levu/ Fiji Islands

Wake-Eniwetok Wake-Eniwetok-

Marshall Isl.

WGS 72 World Geodetic System

1972

WGS 84 World Geodetic System

1984

Zanderij Zanderij- Surinam

125 Man Rev B 7/23/98 11:49 AM Page 76

APPENDIX E

Index

Almanac Data . . . . . . . . . . . . . . . . . . . . . .2

Alarms Setup . . . . . . . . . . . . . . . . . . . . .57

Backlighting . . . . . . . . . . . . . . . . . . . . . . .9

Bearing (BRG) . . . . . . . . . . . . . . . . . . . . .2

Cancelling a GOTO . . . . . . . . . . . . .14, 28

CDI Scale Settings . . . . . . . . . . . . . . . . .53

Compass Page . . . . . . . . . . . . . . . . . . . . .9

Connecting the Power/Data Cable . . . . . .70

Course Made Good (CMG) . . . . . . . . . . . .2

Crosstrack Error (XTE) . . . . . . . . . . . . . . .2

Date and Time Setup . . . . . . . . . . . . . . .52

Desired Track (DTK) . . . . . . . . . . . . . . . .2

DGPS Interface . . . . . . . . . . . . . . . . . . . .50

Differential GPS (DGPS) . . . . . . . . . . . . . .2

Distance and Sun Calculation . . . . . . . . .47

Estimated Time Enroute (ETE) . . . . . . . . .2

Estimated Time of Arrival (ETA) . . . . . . . .2

EZinit . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Getting Started Tour . . . . . . . . . . . . . . . . .7

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . .2

Ground Speed (SOG) . . . . . . . . . . . . . . . .2

Highway Page . . . . . . . . . . . . . . . . . . . . .9

Initialization Troubleshooting . . . . . . . . . .7

Initializing the Receiver . . . . . . . . . . . . .5-6

Installation . . . . . . . . . . . . . . . . . . . . . . .64

Interface Options . . . . . . . . . . . . . . . . . .49

Interface Setup . . . . . . . . . . . . . . . . . . . .49

Introduction . . . . . . . . . . . . . . . . . . . . . .iii

Latitude . . . . . . . . . . . . . . . . . . . . . . . . . .3

Longitude . . . . . . . . . . . . . . . . . . . . . . . .3

Magnetic Heading Reference . . . . . . . . . .54

Man Overboard Function . . . . . . . . . . . .28

Map Datums . . . . . . . . . . . . . . . . . .53, 74

Map Page . . . . . . . . . . . . . . . . . . . . . . . . .9

Clearing a Cluttered Map Display . . .17

Map Setup and Orientation . . . . . . . .55

Selecting Items on the Map Page . . . .56

Track Log Display . . . . . . . . . . . . . . .56

Track Log Setup . . . . . . . . . . . . . . . .47

Using the Cursor on the Map . . . . . .43

Using the Position and Map Pages . . .11

Zooming, Panning, and Pointing . . . .42

Zoom Scale . . . . . . . . . . . . . . . . . . . .42

Menu Page . . . . . . . . . . . . . . . . . . . . . . . .9

Messages . . . . . . . . . . . . . . . . . . . . . . . .72

Mounting the Antenna . . . . . . . . . . . . . .65

Mounting the GPS 125 Sounder . . . . . . .67

Navigation Basics . . . . . . . . . . . . . . . . . . .4

Navigation Page . . . . . . . . . . . . . . . . . . . .9

Navigation Setup . . . . . . . . . . . . . . . . . .53

Navigation Simulator . . . . . . . . . . . .10, 62

Operating Modes . . . . . . . . . . . . . . . . . .51

Position . . . . . . . . . . . . . . . . . . . . . . . . . .3

Position Formats . . . . . . . . . . . . . . . . . .53

Position Page . . . . . . . . . . . . . . . . . . . . . .8

Power Input . . . . . . . . . . . . . . . . . . . . . .70

Power Overload Message . . . . . . . . . . . .68

Power Usage . . . . . . . . . . . . . . . . . . . . .70

Primary Pages . . . . . . . . . . . . . . . . . . . . .8

125 Man Rev B 7/23/98 11:49 AM Page 77

Index

APPENDIX E

Receiver Status . . . . . . . . . . . . . . . . . . . .19

Routes . . . . . . . . . . . . . . . . . . . . . . .31-36

Active From Waypoint . . . . . . . . . . .31

Active Leg . . . . . . . . . . . . . . . . . . . . .31

Active Route Page . . . . . . . . . . . . . . .35

Active To Waypoint . . . . . . . . . . . . . .31

Activating and Inverting . . . . . . . . . .34

Copying . . . . . . . . . . . . . . . . . . . . . .33

Clearing . . . . . . . . . . . . . . . . . . . . . .33

Creating and Navigating . . . . . . . . . .31

Editing . . . . . . . . . . . . . . . . . . . . . . .35

On-Route GOTOs . . . . . . . . . . . . . . .36

Route Definition Page . . . . . . . . . . . .32

Satellite Page . . . . . . . . . . . . . . . . . . . . . .8

Screen Contrast . . . . . . . . . . . . . . . . . . .52

Selecting a GOTO Destination . . . . . . . .12

Sounder Page . . . . . . . . . . . . . . . . . . . . . .8

Auto Range Mode . . . . . . . . . . . . . . .15

Chart Speed . . . . . . . . . . . . . . . . . . .58

Depth Controlled Gain (DCG) . . . . . .37

Depth Units . . . . . . . . . . . . . . . . . . .60

Fish Icon . . . . . . . . . . . . . . . . . . . . .37

Fish ID . . . . . . . . . . . . . . . . . . . . . . .59

Keel Offset . . . . . . . . . . . . . . . . . . . .61

Manual Range Mode . . . . . . . . . . . . .15

Moving the Zoom Window . . . . . . . .16

Noise Rejection . . . . . . . . . . . . . . . . .60

Range Modes . . . . . . . . . . . . . . .15, 59

See-Thru Technology . . . . . . . . . . . . .37

Sensitivity . . . . . . . . . . . . . . . . . . .3, 58

Sounder Alarms . . . . . . . . . . . . . . . .61

Sounder Setup . . . . . . . . . . . . . .40, 58

Sounder Zoom . . . . . . . . . . . . . . . . .15

Thermocline . . . . . . . . . . . . . . . . .3, 14

Underwater Waypoint Feature . . .15, 38

Using the Sounder Page . . . . . . . . . . .14

Whiteline . . . . . . . . . . . . . . . . . . .3, 59

Zoom Function . . . . . . . . . . . . . . . . .39

Specifications . . . . . . . . . . . . . . . . . . . . .71

Speed Filter . . . . . . . . . . . . . . . . . . . . . .54

Speed Over Water (SOW) . . . . . . . . . . . . .3

Starting/Stopping a GOTO . . . . . . . . . . .28

System Setup . . . . . . . . . . . . . . . . . . . . .51

Table of Contents . . . . . . . . . . . . . . . . . . .1

Temperature Range . . . . . . . . . . . . . . . . .71

Time Format . . . . . . . . . . . . . . . . . . . . .52

Time Offsets . . . . . . . . . . . . . . . . . . . . . .73

Tips On Using the TracBack Feature . . . .30

Tone Setting . . . . . . . . . . . . . . . . . . . . . .52

TracBack Navigation . . . . . . . . . . . . . . . .29

Track (TRK) . . . . . . . . . . . . . . . . . . . . . . .3

Track Criteria . . . . . . . . . . . . . . . . . . . . .48

Transducer Installation . . . . . . . . . . . . . .65

Trip Odometer . . . . . . . . . . . . . . . . . . . .20

Turning the GPS 125 Sounder Off . . . . . . .7

Turning the GPS 125 Sounder On . . . . . . .6

Units of Measure . . . . . . . . . . . . . . . . . .54

Universal Transverse Mercator (UTM) . . . .3

Using the Compass Page . . . . . . . . . . . . .46

Using the Highway Page . . . . . . . . . .13, 45

Velocity Made Good (VMG) . . . . . . . . . . .3

Waypoint . . . . . . . . . . . . . . . . . . . . . . . . .3

Editing . . . . . . . . . . . . . . . . . . . . . . .26

Going To a Waypoint . . . . . . . . . . . .12

Marking a Waypoint . . . . . . . . . .10, 21

Nearest Waypoints Page . . . . . . . . . .22

Reference Waypoints . . . . . . . . . . . . .25

Deleting . . . . . . . . . . . . . . . . . . . . . .26

Renaming . . . . . . . . . . . . . . . . . . . . .26

Scanning Waypoints . . . . . . . . . . . . .27

Waypoint Comments . . . . . . . . . . . . .26

Waypoint Definition Page . . . . . . . . .24

Waypoint List Page . . . . . . . . . . . . . .23

125 Man Rev B 7/23/98 11:49 AM Page 78

LIMITED WARRANTY

GARMIN Corporation warrants this product to be free from

defects in materials and workmanship for one year from the date of

purchase. GARMIN will at its sole option, repair or replace any com-

ponents which fail in normal use. Such repairs or replacement will be

made at no charge to the customer for parts or labor. The customer is,

however, responsible for any transportation costs. This warranty does

not cover failures due to abuse, misuse, accident or unauthorized

alteration or repairs. GARMIN assumes no responsibility for special,

incidental, punitive or consequential damages, or loss of use.

The warranties and remedies contained herein are exclusive and

in lieu of all other warranties expressed or implied, including any lia-

bility arising under warranty of merchantability or fitness for a partic-

ular purpose, statutory or otherwise. This warranty gives you specific

legal rights, which may vary from state to state.

To obtain warranty service, call the GARMIN Customer Service

department (913-397-8200) for a returned merchandise tracking

number. The unit should be securely packaged with the tracking

number clearly marked on the outside of the package, and sent freight

prepaid and insured to a GARMIN warranty service station. A copy of

the original sales receipt is required as the proof of purchase for war-

ranty repairs. GARMIN retains the exclusive right to repair or replace

the unit or software at its sole discretion.

125 Man Rev B 7/23/98 11:49 AM Page 79

1200 E. 151st Street, Olathe, KS USA 66062

GARMIN (Europe) LTD - Unit 5, The Quadrangle,

Abbey Park Industrial Estate, Romsey, UK SO51 9AQ

Part Number 190-00111-00 Rev. B Printed in Taiwan

125 Man Rev B 7/23/98 11:49 AM Page 80

Garmin Sounder 125 Users Manual Man Rev B

393-M-Gps-125-Sounder-Manual-Owner-S-Manual 393-m-gps-125-sounder-manual-owner-s-manual

SOUNDER 125 GPS125Sounder_OwnersManual

125 to the manual 6693f7ba-24e0-4deb-970f-0627ccb1e5c4

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