Garmin Ghc 20 Control Unit Technical Reference Guide

2015-05-27

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Technical Reference
for Garmin®
NMEA 2000® Products

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medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or
other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must
contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without
obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and supplemental
information concerning the use and operation of this and other Garmin products.
Garmin®, the Garmin logo, and GPSMAP® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. GFS™, GWS™, GHP™, GXM™,
GFL™, GBT™, GST™, GMI™, GRA™, GET™, GHC™, Intelliducer™, are trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the
express permission of Garmin.
NMEA 2000® and the NMEA 2000 logo are registered trademarks of the National Maritime Electronics Association.

Introduction

Introduction
A NMEA 2000 network consists of connected NMEA 2000 devices that communicate using basic plug-and-play functionality. This technical
reference provides basic NMEA 2000 component identification, basic NMEA 2000 network-building instructions, and a list of NMEA 2000specific data used with Garmin NMEA 2000-certified displays and sensors.
• The first section, NMEA 2000 Fundamentals, provides descriptions of the NMEA 2000 connectors and cables sold by Garmin, and the
fundamental concepts of installing a NMEA 2000 network on your boat.
• The second section, General NMEA 2000 Data Type Requirements, provides a table to help you determine which NMEA 2000 sensors
provide the particular data type you want.
• The last two sections provide Parameter Group Number (PGN) information for Garmin chartplotters and marine instruments as well as
configuration and PGN information for Garmin NMEA 2000 sensors. These sections contain PGN and configuration information for the
following products:
◦◦ GPSMAP® 4000/5000/6000/7000 Series chartplotters
◦◦ GPSMAP 700 Series chartplotters
◦◦ GPSMAP 4x1/5x1/5x6 Series chartplotters
◦◦ GMI™ 10
◦◦ GPS 17x
◦◦ GFS™ 10
◦◦ GRA™ 10
◦◦ GET™ 10
◦◦ GFL™ 10
◦◦ GBT™ 10
◦◦ GST™ 10
◦◦ Intelliducers™
◦◦ GWS™ 10
◦◦ GHP™ 10 (CCU and GHC™ 10)
◦◦ GXM™ 51
◦◦ VHF 200/300
◦◦ AIS 300
◦◦ AIS 600
Note: PGN information is also included in the installation instructions provided with the Garmin NMEA 2000-certified device. Sensor configuration
information is also included in a Sensor Configuration Guide provided with each Garmin NMEA 2000-certified sensor.

• At the end is a checklist. Use this checklist when installing a NMEA 2000 network to be sure you have correctly followed installationcritical procedures.

Contact Garmin

If you experience difficulty installing a NMEA 2000 network, or have other questions about NMEA 2000-certified Garmin devices, contact
Garmin Product Support or a certified NMEA 2000 technician. In the USA, go to www.garmin.com/support, or contact Garmin USA by phone
at (913) 397-8200 or (800) 800-1020.
In the UK, contact Garmin (Europe) Ltd. by phone at 0808 2380000.
In Europe, go to www.garmin.com/support and click Contact Support for in-country support information, or contact Garmin (Europe) Ltd. by
phone at +44 (0) 870.8501241.

Technical Reference for Garmin NMEA 2000 Products

iii

Table of Contents

Table of Contents
Introduction........................................................................................................................................................................................ iii
Contact Garmin.......................................................................................................................................................................................................iii

NMEA 2000 Fundamentals................................................................................................................................................................. 1

Garmin NMEA 2000 Device Overview.................................................................................................................................................................... 1
Building a NMEA 2000 Network.............................................................................................................................................................................. 3
Existing NMEA 2000 Installation Considerations.................................................................................................................................................... 8
NMEA 2000 Glossary.............................................................................................................................................................................................. 8

General NMEA 2000 Data Type Requirements................................................................................................................................. 9
NMEA 2000-Certified Display Device PGN Information................................................................................................................ 13
NMEA 2000-Certified Sensor PGN Information............................................................................................................................. 18

GPS 17x (GPS Antenna)...................................................................................................................................................................................... 18
GFS 10 (Garmin Fuel Sensor).............................................................................................................................................................................. 18
GRA 10 (Garmin Rudder Angle Adapter).............................................................................................................................................................. 18
GET 10 (Garmin Engine Tilt Adapter)................................................................................................................................................................... 18
GFL 10 (Garmin Fluid Level Adapter)................................................................................................................................................................... 19
GBT 10 (Garmin Bennett Trim Tab Adapter)......................................................................................................................................................... 19
GST 10 (Garmin Water Speed and Temperature Adapter)................................................................................................................................... 19
Intelliducer (Intelligent Depth Transducer–Transom Mount and Thru-Hull).......................................................................................................... 19
GWS 10 (Garmin Wind Sensor)............................................................................................................................................................................ 20
GHP 10 (Marine Autopilot System)....................................................................................................................................................................... 20
GXM 51................................................................................................................................................................................................................. 21
VHF 200................................................................................................................................................................................................................ 21
VHF 300................................................................................................................................................................................................................ 21
AIS 300................................................................................................................................................................................................................. 22
AIS 600................................................................................................................................................................................................................. 22

NMEA 2000-Certified Sensor Configuration Information.............................................................................................................. 23

GPS 17x (GPS Antenna)...................................................................................................................................................................................... 23
GFS 10 (Garmin Fuel Sensor).............................................................................................................................................................................. 24
GRA 10 (Garmin Rudder Angle Adapter).............................................................................................................................................................. 26
GET 10 (Garmin Engine Tilt Adapter)................................................................................................................................................................... 27
GFL 10 (Garmin Fluid Level Adapter)................................................................................................................................................................... 29
Restoring Factory Default Settings....................................................................................................................................................................... 32
GBT 10 (Garmin Bennett Trim Tab Adapter)......................................................................................................................................................... 32
GST 10 (Garmin Water Speed and Temperature Adapter)................................................................................................................................... 33
Restoring Factory Default Settings....................................................................................................................................................................... 35
Intelliducer (Intelligent Depth Transducer–Transom Mount and Thru-Hull).......................................................................................................... 36
GWS 10 (Garmin Wind Sensor)............................................................................................................................................................................ 36
NMEA 2000 Checklist .......................................................................................................................................................................................... 37

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

NMEA 2000 Fundamentals
A NMEA 2000 network is made of connected NMEA 2000 devices that communicate using basic plug-and-play functionality.
If your boat already contains a NMEA 2000 network and you would like to add Garmin NMEA 2000 components, see page 8.
For a glossary of commonly used NMEA 2000 terms, see page 8.
After you have installed your NMEA 2000 network, use the checklist on page 37 to verify the installation.

Garmin NMEA 2000 Device Overview

Garmin uses NMEA 2000 micro connectors on units, sensors, and T-connectors that are compatible with other NMEA 2000 micro connectors,
cables, and NMEA 2000-compatible devices. Garmin sensors may be packaged with a drop cable and a T-connector. Garmin displays may also
include additional NMEA 2000 components (such as a power cable). The NMEA 2000 components included with a Garmin sensor or display
are listed in the product documentation. A diagram on the product box shows which NMEA 2000 components are included.

Sample Box Diagram (GFS 10)

In the sample box diagram, a complete NMEA 2000 network is shown, and the parts included with the sensor are shaded. In this example, a
T-connector is included with a Garmin GFS 10 fuel sensor. A NMEA 2000 power cable, terminators, an additional drop/backbone cable, and
additional T-connectors are not included with a GFS 10 fuel sensor. The GFS 10 fuel sensor, as shown by the shaded components in the box
diagram, is intended to be connected to an existing NMEA 2000 network on your boat. If you do not have a NMEA 2000 network on your boat,
this guide will help you assemble one.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

NMEA 2000 Components

The main components of a NMEA 2000 network are T-connectors, terminators, backbone/drop cables, and a power cable. The following cables,
connectors, and terminators are sold by Garmin, and as of January 2009, they are NMEA 2000 approved. NMEA 2000-approved cables sold by
Garmin feature the NMEA 2000 logo on the tag with the part number.
T-connector

Male Terminator

Female Terminator

In-line Terminator

010-11078-00 (Garmin part number)

010-11080-00

010-11081-00

010-11096-00

Power Cable

010-11079-00 (2 meters [6.5 feet]) (3 A fuse included)
Backbone/Drop Cable

305 millimeters (1 foot)

010-11076-03

2 meters (6.5 feet)

010-11076-00

6 meters (20 feet)

010-11076-01

10 meters (33 feet) (backbone only)

010-11076-02

30 meter spool (98.5 feet) (backbone only)

010-11171-01

Specialty Cable/Connectors

Right-angle drop-cable, 2 meters (6.5 feet) (pictured)

010-11089-00

Field-installable connector - Male* (not pictured)

010-11094-00

Field-installable connector - Female* (not pictured)

010-11095-00

NMEA 2000 network power switch (not pictured)

K00-00368-00

NMEA 2000 in-line lightning arrestor** (not pictured)

010-11171-02

* The field-installable connectors are used to create custom-length drop cables and custom-length backbone extension cables. The field-installable connectors can be used to
shorten any Garmin NMEA 2000 drop/backbone cable.
** The gray in-line lightning arrestor is designed to help prevent damage due to nearby lightning strikes, but it is not able to protect against direct lightning strikes. Garmin is
not responsible for lightning-strike related damage.

NOTE: All male/female connections are interchangeable. Ensure that the T-connectors are used properly when constructing your NMEA 2000 network.
See page 4.
2

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

Building a NMEA 2000 Network

The main communication channel of a NMEA 2000 network is a backbone to which your NMEA 2000 devices connect. Each NMEA 2000
device connects to the backbone with a T-connector. The NMEA 2000 backbone must be connected to power, and terminators must be installed
at both ends for the network to function correctly.
When you design a NMEA 2000 network, start by creating a diagram of the network. When creating the diagram, be as detailed as possible:
•
•
•
•

Include all of the devices you intend to connect to your network
Note the approximate location of the backbone and devices on your boat
Measure the distances between devices and the backbone, as well as the overall length of the backbone
Note the power consumption of each device (Load Equivalency Number)
Chartplotter

Fuel sensor

Marine instrument

Intelligent transducer
Ignition or
in-line switch
Fuse

Battery - 12 Vdc

Female
terminator

Power cable
Backbone extension cable

Drop cable

T-connector
Male
terminator

NMEA 2000 backbone
Sample NMEA 2000 Network

Note: This diagram illustrates the NMEA 2000 data connections to each device or sensor. Some devices or sensors can be powered by the NMEA
2000 network; others may require a separate power connection. Consult the installation instructions for each device you connect to your NMEA 2000
network to be sure you supply power to the device appropriately.

When building a NMEA 2000 network, you must follow certain rules to make sure your NMEA 2000 network functions correctly. Be sure to
understand the following concepts:
•
•
•
•

Linear backbone construction (page 4)
Power connection and distribution (page 5)
Proper termination (page 7)
Cable length and device limits (page 8)

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

Linear Backbone Construction

Use the NMEA 2000 T-connectors to construct your NMEA 2000 backbone, and extend the backbone with appropriate lengths of backbone
cable if necessary. Use one T-connector per device. Use the sides of the T-connector to construct the backbone of the NMEA 2000 network, and
use the top of the T-connector to attach a NMEA 2000 device. By using only the sides of the T-connectors to construct the backbone, you create
a linear construction to your NMEA 2000 network. T-connectors can be separated by backbone cables or connected directly together.
Although the male and female connectors on the T-connectors and backbone cables will fit on all sides of a T-connector, it is very important to
use the top of the T-connector only to attach NMEA 2000 devices, not to attach other T-connectors or backbone cables.
To NMEA 2000 devices
and power

Female
terminator

T
C
E

R
R
O

Male
terminator

Backbone extension cable

Correct Linear Backbone Construction

To NMEA 2000 devices
and power
T-connector
installed incorrectly

Male
terminator
(also installed
incorrectly)

T
C
E

R
R
O

C
N
I

Backbone extension cable

Male
terminator

Incorrect Linear Backbone Construction

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

Power Connection and Distribution

Your NMEA 2000 network must be connected to a 12 Vdc power supply. Do not connect your NMEA 2000 network to any other voltage
source, such as a 24 Vdc power supply. Use a NMEA 2000 power cable to connect your NMEA 2000 backbone to the auxiliary power switch
on your boat. If you do not have an auxiliary power switch, or if connecting to the auxiliary power switch causes electrical interference, connect
the NMEA 2000 power cable directly to the battery and install an in-line switch.
caution: If you connect the NMEA 2000 network to your battery without an in-line switch, it may drain your battery.

Be sure to ground the NMEA 2000 power cable. Connect the bare shield-drain wire to the same location as the ground (black) wire.
The Garmin NMEA 2000 power cable connects to a T-connector like other drop cables. Be sure to connect the NMEA 2000 power cable to the
top of a T-connector; never connect the NMEA 2000 power cable to the side of a T-connector. You can connect power either at the end of your
NMEA 2000 network or in the middle. When planning where to place the power cable and the T-connector on your NMEA 2000 network, you
will need to evaluate how the NMEA 2000 devices connected to your network use power. The NMEA 2000 network will work properly when
there is no more than a 3 Vdc drop in the supply voltage between the power source and the NMEA 2000 device located farthest from the power
source on the NMEA 2000 network. To determine the voltage drop in your NMEA 2000 network, use this equation:
Voltage Drop = Cable resistance (ohms/m)* × Distance (from the battery to the farthest device, in meters) × Network Load** × 0.1
* Garmin cable resistance value = 0.053
** Network Load = the sum of Load Equivalent Numbers (LEN) between the battery and the end of the network. The LEN for each device should be visible on
the device, or provided in the documentation for the device.

• If you calculate a voltage drop of 3.0 Vdc or less, then you can connect power to either the end or the middle of your NMEA 2000 network,
and it will function correctly.
• If you calculate a voltage drop of more than 3.0 Vdc, you must connect power to the middle of your NMEA 2000 network. The location will
depend on the network load and distance from the battery. Try to balance the voltage drop equally on both sides of the power connection.
• If a voltage drop of under 3.0 Vdc is not possible on your NMEA 2000 network, contact a professional installer.

Examples

The following examples show a correctly designed, end-powered NMEA 2000 network; an incorrectly designed NMEA 2000 network; and a
redesign of the incorrectly designed NMEA 2000 network to correctly balance power on the network.
End-powered NMEA 2000 network, correctly designed:

Power cable
Length = 2 m

NMEA 2000compliant device
LEN = 4

T
C
E

R
R
O

Drop cable
Length = 2 m

Drop cable
Length = 6 m

When the voltage-drop formula is applied to this example, we
see that the voltage drop is less than 3.0 Vdc. This NMEA 2000
network will function correctly when powered at the end.

Drop cable
Length = 6 m

Backbone cable
Length = 10 m

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000compliant device
LEN = 7

NMEA 2000compliant device
LEN = 5

Voltage Drop = 0.053 × (2 + 10 + 10 + 6) × (4 + 5 + 7) × 0.1 = 2.37 Vdc
Cable
resistance

Distance

Network load

NMEA 2000 Fundamentals

End-powered NMEA 2000 network, incorrectly designed:

NMEA 2000compliant device
LEN = 4

Drop cable
Length = 2 m

Power cable
Length = 2 m

NMEA 2000compliant device
LEN = 7

NMEA 2000compliant device
LEN = 5

T
C
E

R
R
O

C
N
I

Backbone cable
Length = 10 m

Backbone cable
Length = 20 m

When the voltage drop formula is applied to this example, we see
that the voltage drop is greater than 3.0 Vdc, so this NMEA 2000
network will not function correctly when powered at the end.

Drop cable
Length = 6 m

Voltage Drop = 0.053 × (2 + 20 + 10 + 6) × (4 + 5 + 7) × 0.1 = 3.22 Vdc
Cable
resistance

Distance

Network load

This NMEA 2000 network must be redesigned with the power connected to the center of the network in order to function correctly.
Middle-powered NMEA 2000 network, correctly designed:
NMEA 2000compliant device
LEN = 4

Drop cable
Length = 2 m

NMEA 2000compliant device
LEN = 5

R
R
O

Power cable
Length = 2 m

Backbone cable
Length = 20 m

T
C
E

Drop cable
Length = 6 m

NMEA 2000compliant device
LEN = 7
Drop cable
Length = 6 m

Backbone cable
Length = 10 m

When the NMEA 2000 network is redesigned with the power source in the center, you calculate the voltage drop in both directions. If the
T-connector to which you connect the power source is connected directly to another T-connector (as shown in this example), use the LEN from
that device as part of the calculation for both directions.
Voltage Drop Left = 0.053 × (2 + 20 + 2) × (4 + 5) × 0.1 = 1.145 Vdc
When the voltage drop formula is applied to both the left and right
sides of the power source in this example, we see that the voltage drop
Cable
Distance Network load
resistance
is less than 3.0 Vdc on each side, so the NMEA 2000 network will
Voltage Drop Right = 0.053 × (2 + 10 + 6) × (5 + 7) × 0.1 = 1.145 Vdc
function correctly.
Note: The equation and examples provide conservative estimates for calculating voltage drop.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

Proper Termination

You must install terminators at the ends of your NMEA 2000 backbone for it to function correctly. You have two options when installing
terminators on your NMEA 2000 network.
1. Typical Terminators

If your NMEA 2000 network is built with correct linear backbone construction, use one female terminator and one male terminator. Install
the terminators at opposite ends of your NMEA 2000 network.
To NMEA 2000 devices
and power

Female
terminator

Male
terminator

Backbone extension cable

Using Standard Terminators

2. In-line Terminators

If one or both of the NMEA 2000 devices at opposite ends of your NMEA 2000 network are separated from the rest of the NMEA 2000
network by a length of backbone cable, and the typical T-connector/drop cable/terminator combination is not feasible or is too bulky for the
area, use an in-line terminator instead of the final T-connector on the backbone. Connect the final device to the in-line terminator with the
appropriate length of drop cable, or connect the final device directly to the in-line terminator, without a drop cable.
Standard Termination

Inline Termination

To power
To a NMEA
2000 device

Female
terminator

Backbone
extension
cable

To the final NMEA 2000 device in the
backbone on this end. Connect the in-line
terminator directly to a NMEA 2000 device,
or use a drop cable up to 6 m (20 ft.) long.
Do not connect additional T-connectors or
terminators.
Inline
terminator

Using an Inline Terminator

Caution: Do not use more than two terminators in a NMEA 2000 network.
Note: The in-line terminator connects to the NMEA 2000 backbone with a male connector, and to the final NMEA 2000 device with a female
connector. Because of this, you can only use one in-line terminator on a NMEA 2000 network.
Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Fundamentals

Cable Length and Device Limits

When building your NMEA 2000 network, keep in mind these limitations:
• The distance between any two points on the NMEA 2000 network must not exceed 100 m (328 ft). To estimate this distance, measure
between the terminators on your backbone and add the length of the drop cable for the devices connected to the T-connectors at the ends of
the network.
• The total length of all drop cables cannot exceed 78 m (256 ft).
• The maximum length of a single drop cable to a NMEA 2000 device is 6 m (20 ft).
• No more than 50 NMEA 2000 devices can be connected to your NMEA 2000 network.

Existing NMEA 2000 Installation Considerations

If your boat has an existing NMEA 2000 installation, and you would like to add Garmin NMEA 2000 equipment, there are a few things to
consider:
Cable Type: Garmin uses NMEA 2000 micro connectors for all cables and connectors. Your existing NMEA 2000 network may use NMEA
2000 mini connectors and cables in the backbone. Mini connectors are larger than micro connectors, and you will need to use a converter or
adapter to connect with Garmin NMEA 2000 devices.
Power: Is the existing NMEA 2000 network connected to power? A NMEA 2000 network must be connected to power to function correctly
(page 5). Do not connect the NMEA 2000 network to power at more than one location.
Termination: Are terminators installed on the ends of the existing NMEA 2000 backbone? A NMEA 2000 network must be terminated to
function correctly. Do not add more terminators to a NMEA 2000 network if it is already properly terminated.
If you are unsure of any of these considerations, contact your boat manufacturer or a certified NMEA 2000 technician for assistance.

NMEA 2000 Glossary

T-connector—Three-way connector with one male and two female micro connectors. A T-connector is used to connect a NMEA 2000 device to
the NMEA 2000 backbone.
Terminator—120 ohm resistor located at each end of the NMEA 2000 backbone. Proper termination helps ensure signal integrity across the
entire length of the backbone.
Inline Terminator—Special terminator with male and female connectors, which allows direct connection to the a device at the end of the
NMEA 2000 backbone. The inline terminator simplifies installation by not requiring a T-connector, terminator, and drop cable for the device at
the end of the backbone.
Drop Cable—Cable connecting a NMEA 2000 device to the NMEA 2000 backbone. Drop cables are limited to 6 m (20 ft.) maximum length.
Backbone Cable—In conjunction with T-connectors, the backbone cables create the main communication path of the NMEA 2000 network.
A backbone cable extends the NMEA 2000 backbone to connect NMEA 2000 devices located in different places on the boat. The maximum
backbone cable length is 100 m (328 ft.).
Device—Electronic hardware that connects to the NMEA 2000 network. A device may only receive data transmitted by other devices on the
network, or may both transmit and receive data on the network.
Network Power—12 Vdc power supplied to the NMEA 2000 network. Power should be connected through a switch (instead of directly
connected to the battery) because some devices are always on when NMEA 2000 power is present. NMEA 2000 devices must operate from 9 to
16 Vdc, with a nominal voltage of 12 Vdc.
LEN (Load Equivalency Number)—A number that indicates the amount of current a device draws from the NMEA 2000 network.
1 LEN = 50 mA. Each device should have an LEN specified on the product or in the product documentation.

Technical Reference for Garmin NMEA 2000 Products

General NMEA 2000 Data Type Requirements

General NMEA 2000 Data Type Requirements
Each NMEA 2000-certified sensor provides unique information to the NMEA 2000-certified display devices (such as a GPSMAP 4000/5000
series chartplotter or a GMI 10) on the NMEA 2000 network. The data you can view on your display device depends on the sensors you have
installed and configured. Refer to the following table for a list of data types that you can view on a display device; specific NMEA 2000 PGN
information required to view or calculate that data type; and the NMEA 2000 sensor that typically provides required PGN information. In some
cases, more than one sensor is necessary or a specific combination of sensors may provide more-precise information. For more about PGN
information, see page 18.
Category

Data Type

PGN Data Required

Typical Sender

Engine Information

Battery Voltage

127489 - Eng Dynamic

NMEA 2000-compatible engine

Fuel Flow Rate

127489 - Eng Dynamic

Fuel Flow Sensor

Hours

127489 - Eng Dynamic

NMEA 2000-compatible engine

Oil Pressure

127489 - Eng Dynamic

NMEA 2000-compatible engine

Engine RPM

127488 - Engine Rapid

NMEA 2000-compatible engine

Fuel Information

Navigation
Information

Temperature

127489 - Eng Dynamic

NMEA 2000-compatible engine

Coolant Pressure

127489 - Eng Dynamic

NMEA 2000-compatible engine

Fuel Pressure

127489 - Eng Dynamic

NMEA 2000-compatible engine

Oil Temperature

127489 - Eng Dynamic

NMEA 2000-compatible engine

Boost Pressure

127488 - Engine Rapid

NMEA 2000-compatible engine

Trim

127488 - Engine Rapid

NMEA 2000-compatible engine

Rudder Angle

127245 - Rudder

Rudder Angle Sensor

Bow Tabs

130576 - Small Craft Status

Trim Tab Sensor

Trim Tabs

130576 - Small Craft Status

Trim Tab Sensor

Total Fuel Flow Rate

127489 - Eng Dynamic

Fuel Flow Sensor

Total Fuel Onboard

127489 - Eng Dynamic

Fuel Flow Sensor

Fuel Economy

127489 - Eng Dynamic (GPS Speed or Water Speed)
Note: The Fuel Economy data type is configurable,
based on the fuel speed source

Fuel Flow Sensor and Speed Sensor

Cruising Range

127489 - Eng Dynamic (GPS Speed or Water Speed)

Fuel Flow Sensor and Speed Sensor

Fuel Level

127505 - Fluid Level

Fuel Level Sensor

Tank 1

127505 - Fluid Level

Fuel Level Sensor

Tank 2

127505 - Fluid Level

Fuel Level Sensor

Course Made Good

129026 - COG/SOG, 129029 - GNSS Position,
129284 - Nav Data, 129285 - Route, and
129283 - XTE

Garmin Chartplotter and GPS Antenna

Distance Made Good

129026 - COG/SOG, 129029 - GNSS Position,
129284 - Nav Data, and 129285 - Route

Garmin Chartplotter and GPS Antenna

Waypoint Name

129284 - Nav Data or 129285 - Route

Garmin Chartplotter

Bearing to Waypoint

129284 - Nav Data

Garmin Chartplotter and GPS Antenna

Distance to Waypoint

129284 - Nav Data

Garmin Chartplotter and GPS Antenna

Off Course

129283 - XTE

Garmin Chartplotter and GPS Antenna

Desired COG

129284 - Nav Data

Garmin Chartplotter and GPS Antenna

Heading

127250 - Vessel Heading

Heading Sensor

Course Over Ground

129026 - COG/SOG and 129029 - GNSS Position

GPS Antenna

(Continued)

Technical Reference for Garmin NMEA 2000 Products

General NMEA 2000 Data Type Requirements

Category

Data Type

PGN Data Required

Typical Sender

Water

Depth

128267 - Water Depth

Depth Transducer

Temperature

130312 - Temp, 130310 - Envir Param Old, or
130311 - Envir Param

Water Temperature Sensor

Speed

128259 - Water Speed

Water Speed Sensor

Set

129026 - COG/SOG, 129029 - GNSS Position,
128259 - Water Speed, and 127250 - Vessel Heading

GPS Antenna, Water Speed Sensor, and
Heading Sensor

Drift

129026 - COG/SOG, 129029 - GNSS Position,
128259 - Water Speed, and 127250 - Vessel Heading

GPS Antenna, Water Speed Sensor, and
Heading Sensor

Time Of Day

129026 - COG/SOG and 129029 - GNSS Position

GPS Antenna

Date

129026 - COG/SOG and 129029 - GNSS Position

GPS Antenna

Timer

None

Unit Voltage

None

System

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Compatible Display Device PGN Information

NMEA 2000-Certified Display Device PGN Information
All data transmitted on a NMEA 2000 network are organized into groups. These groups are identified by a Parameter Group Number (PGN)
that describes the type of data contained in the group. All Garmin NMEA 2000 devices use the proprietary PGN numbers 126720 and 61184.
All other PGN numbers follow the NMEA 2000 standard.
The following tables list the non-proprietary PGN information for all Garmin NMEA 2000-certified display devices.
For NMEA 2000 configuration information on every available Garmin NMEA 2000-certified display device, see the owner’s manual for your
display device.

GPSMAP 6000/7000 Series Chartplotters
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126992

System Time

126996

Product Information

126996

Product Information

127250

Vessel Heading

127250

Vessel Heading

127258

Magnetic Variance

127489

Engine Parameters - Dynamic

128259

Speed - Water Referenced

127488

Engine Parameters - Rapid Update

128267

Water Depth

127493

Transmission Parameters, Dynamic

129025

Position - Rapid Update

127505

Fluid Level

129026

COG & SOG - Rapid Update

128259

Speed - Water Referenced

129029

GNSS Position Data

128267

Water Depth

129283

Cross Track Error

129025

Position - Rapid Update

129284

Navigation Data

129026

COG & SOG - Rapid Update

129285

Navigation Route/Waypoint Info

129029

GNSS Position Data

129540

GNSS Sats in View

129038

AIS Class A Position Report

130306

Wind Data

129039

AIS Class B Position Report

130312

Temperature

129040

AIS Class B Extended position report

129539

GNSS DOPs

129540

GNSS Sats in View

129794

AIS Class A Static and Voyage Related Data

129808

DSC Call Information

129809

AIS Class B "CS" Static Data Report, Part A

129810

AIS Class B "CS" Static Data Report, Part B

130306

Wind Data

130310

Environmental Parameters

130311

Environmental Parameters

130312

Temperature

130313

Humidity

130314

Actual Pressure

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Compatible Display Device PGN Information

GPSMAP 4000/5000 Series Chartplotters
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126992

System Time

126996

Product Information

126996

Product Information

127250

Vessel Heading

127250

Vessel Heading

127258

Magnetic Variation

127488

Engine Parameters - Rapid Update

128259

Speed - Water Referenced

127489

Engine Parameters - Dynamic

128267

Water Depth

127505

Fluid Level

129025

Position - Rapid Update

128259

Speed - Water Referenced

129026

COG & SOG - Rapid Update

128267

Water Depth

129029

GNSS Position Data

129025

Position - Rapid Update

129540

GNSS Sats in View

129026

COG & SOG - Rapid Update

129283

Cross Track Error

129029

GNSS Position Data

129284

Navigation Data

129539

GNSS DOPs

12985

Navigation - Route/Waypoint Information

129540

GNSS Sats in View

130306

Wind Data

130306

Wind Data

130312

Temperature

130310

Environmental Parameters

130311

Environmental Parameters

130312

Temperature

130313

Humidity

130314

Actual Pressure

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Compatible Display Device PGN Information

GPSMAP 700 Series Chartplotters
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126996

Product Information

126996

Product Information

127245

Rudder

127250

Vessel Heading

127250

Vessel Heading

127258

Magnetic Variance

127488

Engine Parameters - Rapid Update

128259

Speed - Water Referenced

127489

Engine Parameters - Dynamic

128267

Water Depth

127493

Transmission Parameters - Dynamic

129025

Position, Rapid Update

127498

Engine Parameters - Static

129026

COG/SOG Rapid Update

127505

Fluid Level

129029

GNSS - Position Data

128259

Speed - Water Referenced

129283

Cross Track Error

128267

Water Depth

129284

Navigation Data

129038

AIS Class A Position Report

129285

Navigation - Route/WP information

129039

AIS Class B Position Report

129539

GNSS DOPs

129040

AIS Class B Extended Position Report

129540

GNSS Sats in View

129794

AIS Class A Static and Voyage Related Data

130306

Wind Data

129798

AIS SAR Aircraft position report

129799

Radio Frequency/Mode/Power

129802

AIS Safety Related Broadcast Message

129808

DSC Call Information

130306

Wind Data

130576

Small Craft Status

130310

Environmental Parameters

130311

Environmental Parameters (Obsolete)

130312

Temperature

130313

Humidity

130314

Actual Pressure

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Compatible Display Device PGN Information

GPSMAP 4x1/5x1 Series Chartplotters
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126996

Product Information

126996

Product Information

127250

Vessel Heading

127250

Water Depth

127488

Engine Parameters - Rapid Update

128259

Speed - Water Referenced

127489

Engine Parameters - Dynamic

128267

Water Depth

127505

Fluid Level

129025

Position, Rapid Update

128259

Speed - Water Referenced

129026

COG/SOG Rapid Update

128267

Water Depth

129029

GNSS - Position Data

129038

AIS Class A Position Report

129283

Cross Track Error

129039

AIS Class B Position Report

129284

Navigation Data

129040

AIS Class B Extended Position Report

129285

Navigation - Route/WP information

129794

AIS Class A Static and Voyage Related Data

129539

GNSS DOPs

129799

Radio Frequency/Mode/Power

129540

GNSS Sats in View

129808

DSC Call Information

130306

Wind Data

130306

Wind Data

130310

Environmental Parameters

130311

Environmental Parameters (Obsolete)

130312

Temperature

130313

Humidity

130314

Actual Pressure

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor PGN Information

GMI 10
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126992

System Time

126996

Product Information

126996

Product Information

127250

Vessel Heading

127488

Engine Parameters - Rapid Update

127488

Boost Pressure

127489

Coolant Pressure

127489

Fuel Pressure

127489

Oil Temperature

127489

Engine Parameters - Dynamic

127505

Fluid Level

128259

Speed - Water Referenced

128267

Water Depth

129025

Position - Rapid Update

129026

COG & SOG - Rapid Update

129029

GNSS Position Data

129044

Datum

129283

Cross Track Error

129284

Navigation Data

129285

Navigation - Route/WP information

129539

GNSS DOPs

129540

GNSS Sats in View

130306

Wind Data

130310

Environmental Parameters

130311

Environmental Parameters

130312

Temperature

130313

Humidity

130314

Actual Pressure

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor PGN Information

NMEA 2000-Certified Sensor PGN Information
The following tables list the non-proprietary PGN information for all Garmin NMEA 2000-certified sensors.

GPS 17x (GPS Antenna)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126992

System Time and Date

126996

Product Information

129025

Position - Rapid Update

129026

COG & SOG - Rapid Update

129029

GNSS Position Data

129539

GNSS DOPs

129540

GNSS Sats in View

GFS 10 (Garmin Fuel Sensor)
Transmit

Receive

059392

ISO Acknowledgement

059392

ISO Acknowledgement

060928

ISO Address Claim

059904

ISO Request

126208

NMEA–Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA–Command/Request/Acknowledge Group Function

126996

Product Information

127489

Engine Parameters - Dynamic

127489

Engine Parameters–Dynamic

127497

Trip Parameters, Engine

127497

Trip Parameters, Engine

127505

Fluid Level (when calibrated using a Garmin chartplotter or
marine instrument)

127505

Fluid Level (when calibrated using a Garmin chartplotter
or marine instrument)

GRA 10 (Garmin Rudder Angle Adapter)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

127245

Rudder

GET 10 (Garmin Engine Tilt Adapter)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor PGN Information

Transmit

Receive

126464

Transmit/Receive PGN List Group Function

126996

Product Information

127488

Engine Parameters - Rapid Update

126208

NMEA - Command/Request/Acknowledge Group Function

GFL 10 (Garmin Fluid Level Adapter)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

127505

Fluid Level

GBT 10 (Garmin Bennett Trim Tab Adapter)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

130576

Small Craft Status

GST 10 (Garmin Water Speed and Temperature Adapter)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

128259

Speed - Water Referenced

130312

Temperature

Intelliducer (Intelligent Depth Transducer–Transom Mount and Thru-Hull)
Transmit

Receive

059392

ISO Acknowledgement

059392

ISO Acknowledgement

060928

ISO Address Claim

059904

ISO Request

126208

NMEA–Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126208

NMEA–Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126996

Product Information

128267

Water Depth

130312

Temperature

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor PGN Information

GWS 10 (Garmin Wind Sensor)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

130306

Wind Data

130312

Temperature

130314

Actual Pressure

GHP 10 (Marine Autopilot System)

The GHP 10 autopilot system contains two components that utilize NMEA 2000, the CCU and the GHC 10.

CCU
Transmit

Recieve

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126996

Product Information

126996

Product Information

127250

Vessel Heading

127258

Magnetic Variation

127488

Engine Parameters - Rapid Update

129025

Position - Rapid Update

129026

COG & SOG - Rapid Update

129283

Cross Track Error

129284

Navigation Data

GHC 10 (Marine Autopilot Control Unit)
Transmit

Recieve

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA - Command/Request/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126464

Transmit/Receive PGN List Group Function

126464

Transmit/Receive PGN List Group Function

126996

Product Information

126996

Product Information

129025

Position - Rapid Update

127250

Vessel Heading

129026

COG & SOG - Rapid Update

127488

Engine Parameters - Rapid Update

129029

GNSS Position Data

129025

Position - Rapid Update

129283

Cross Track Error

129029

GNSS Position Data

129284

Navigation Data

129284

Navigation Data

129285

Navigation - Route/WP information

129285

Navigation - Route/WP information

129540

GNSS Sats in View

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

GXM 51 (XM Weather and Radio - North America Only)
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA - Command/Request/Acknowledge Group
Function

060928

ISO Address Claim

126464

Transmit/Receive PGN List Group Function

126208

NMEA - Command/Request/Acknowledge Group Function

126996

Product Information

VHF 200
Transmit

Receive

059392

ISO Acknowledgment

059392

ISO Acknowledgment

060928

ISO Address Claim

059904

ISO Request

126208

NMEA Request/Command/Acknowledge Group
Function

060928

ISO Address Claim

126464

PGN List

126208

NMEA - Command/Request/Acknowledge Group Function

129026

COG (course over ground) and SOG (speed over ground) - Rapid
Update

129029

GNSS (Global Navigation Satellite System) Position Data

126996

Product Information

129799

Radio Frequency/Mode/Power

129808

DSC Call Information

VHF 300
Receive
059392

Transmit
ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA Request/Command/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group
Function

126464

PGN List

129026

COG (course over ground) and SOG (speed over
ground) - Rapid Update

126996

Product Information

129029

GNSS (Global Navigation Satellite System) Position
Data

129038

AIS Class A Position Report

129039

AIS Class B Position Report

129040

AIS Class B Extended Position Report

129794

AIS Class A Static and Voyage Related Data

129798

AIS SAR Aircraft Position Report

129808

DSC Call Information

129799

Radio Frequency/Mode/Power

129799

Radio Frequency/Mode/Power

129808

DSC Call Information

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

AIS 300
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA Request/Command/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group
Function

126464

PGN List

126992

System Time

126996

Product Information

129038

AIS Class A Position Report

129039

AIS Class B Position Report

129040

AIS Class B Extended Position Report

129794

AIS Class A Static and Voyage Related Data

129798

AIS SAR Aircraft Position Report

129802

AIS Safety Related Broadcast Message

129809

AIS Class B “CS” Static Data Report, Part A

129810

AIS Class B “CS” Static Data Report, Part B

AIS 600
Receive

Transmit

059392

ISO Acknowledgment

059392

ISO Acknowledgment

059904

ISO Request

060928

ISO Address Claim

060928

ISO Address Claim

126208

NMEA Request/Command/Acknowledge Group Function

126208

NMEA - Command/Request/Acknowledge Group
Function

126464

PGN List

126992

System Time

126996

Product Information

129038

AIS Class A Position Report

129039

AIS Class B Position Report

129040

AIS Class B Extended Position Report

129794

AIS Class A Static and Voyage Related Data

129798

AIS SAR Aircraft Position Report

129802

AIS Safety Related Broadcast Message

129809

AIS Class B “CS” Static Data Report, Part A

129810

AIS Class B “CS” Static Data Report, Part B

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

NMEA 2000-Certified Sensor Configuration Information
Garmin NMEA 2000-certified sensors each have a Sensor Configuration Guide included in the package. For convenience, this section contains
the configuration information for all Garmin NMEA 2000 sensor. All NMEA 2000 device configuration options are set from the NMEA 2000
configuration menu on your NMEA 2000 display device.
Important: To access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display
device.

GPS 17x (GPS Antenna)

Enabling and Disabling WAAS (Wide Area Augmentation System)/EGNOS (Euro Geostationary
Navigation Overlay Service)

When enabled, WAAS/EGNOS provides more-accurate position information. For more information on WAAS/EGNOS, visit www.garmin.com.
1. While viewing the NMEA 2000 configuration menu, select the GPS 17x device.
2. Select Config > WAAS/EGNOS.
3. On a Garmin chartplotter, select On or Off.

Setting the Speed Filter

The speed filter setting on the GPS 17x can help reduce unnecessary drift alarm triggers as well as potentially sporadic position information.
The speed filter averages the data provided by the GPS 17x to provide smoother position data updates. The speed filter is most helpful when
stationary or in low-speed situations.
1. While viewing the NMEA 2000 configuration menu, select the GPS 17x device.
2. Select Config > Speed Filter.
3. Choose from the following options:
• Off—position information from the GPS 17x is provided to the NMEA 2000 network as it is gathered.
• On—position information from the GPS 17x is gathered and averaged before it is provided to the NMEA 2000 network. Select the interval
at which the position information is gathered.
• Auto—the speed filter toggles on in low-speed situations and toggles off in high-speed situations.

Refreshing GPS Satellite Acquisition

In some situations, if you have moved the boat many miles without using the GPS 17x, for example, you can force the GPS 17x to re-initialize
and find your current position.
1. While viewing the NMEA 2000 configuration menu, select the GPS 17x device.
2. Select Config > Auto Locate.
3. Wait for the GPS 17x to acquire satellites.

Restoring Factory Default Settings

You can restore factory default settings to the GPS 17x. You will lose all custom configuration settings when you restore factory default
settings.
To restore factory default settings:
1. While viewing the NMEA 2000 configuration menu, select the GPS 17x device.
2. Select Config > Factory Defaults.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

GFS 10 (Garmin Fuel Sensor)
Caution: The GFS 10 is a sensor that helps you better determine the amount of fuel used on your boat. You should not rely solely on the GFS 10 for
fuel-level information. Carefully compare information displayed on the unit to all available fuel-level instruments and sources.

Using Fuel-Flow Information With a Garmin Chartplotter or Marine Instrument
Caution: The Garmin chartplotter or marine instrument must be powered on to calculate remaining fuel based on the fuel-flow rate.

Important: When using the GFS 10 to calculate remaining fuel based on the fuel-flow rate, you must specify the amount of fuel each time you
add fuel to the tank.
To specify the amount of fuel added:
1. While viewing the fuel page or fuel instrument screen on your NMEA 2000 device, select Menu.
2. Choose from the following options:
• Fill Up Tank—set the fuel level to the maximum capacity.
• Add Fuel to Boat—specify the amount of fuel added.
• Set Total Fuel Onboard—specify the amount of fuel currently available in the fuel tank or tanks.

Changing the Fuel Economy Source

The Garmin chartplotter or marine instrument requires a speed sensor, in addition to the GFS 10, to calculate fuel economy.
To change the fuel economy source:
1. While viewing the fuel page or fuel instrument screen on your NMEA 2000 device, select Menu > Fuel Economy Source.
2. Select either GPS Speed or Water Speed to specify which speed sensor is used to calculate fuel economy.

Using Fuel-Level Information With a Garmin Chartplotter or Marine Instrument

To receive fuel-level information, connect the wiring harness on the GFS 10 to the fuel gauge or fuel-level sensor of your boat according to the
GFS 10 Installation Instructions.
To calibrate fuel-level information from the GFS 10:
1. While in still water, on the NMEA 2000 device configuration menu, select the GFS 10 device that is connected to the fuel tank you want to
configure.
Tip: The serial number of each GFS 10 is shown on the NMEA 2000 device configuration screen to help differentiate among multiple GFS 10 devices.
2. Select Config > Level Calibration > Add Calibration Point and enter a calibration point that corresponds to the current fuel level in that
fuel tank.

Entering more calibration points will provide a more-accurate reading. For example, entering five calibration points (empty tank, 1/4 tank, 1/2
tank, 3/4 tank, and full tank) will provide a more-accurate reading than entering two calibration points (empty tank and full tank).
Tip: For a quick calibration, start with an empty tank, and enter calibration points as you fill up the tank.
To reset the fuel-level calibration:
1. While viewing the NMEA 2000 device configuration menu, select the GFS 10 device that is connected to the fuel tank you want to configure.
2. Select Config > Level Calibration > Reset Calibration.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

Configuring Engine and Tank Information

If you have a multi-engine or a multi-tank setup on your boat, specify which engine or tank is associated with each GFS 10.
Tip: The serial number of each GFS 10 is shown on the NMEA 2000 device configuration menu to help differentiate among multiple GFS 10 devices.
To configure tank and engine information for the GFS 10:
1. While viewing the NMEA 2000 device configuration menu, select the GFS 10 device you want to configure, and select Config.
2. Select from the following options:
• Engine Number—for a multi-engine installation, assign the selected GFS 10 to a specific engine.
• Tank Number—for a multi-tank installation, assign the selected GFS 10 to a specific tank.
• Tank Capacity—define the fuel capacity of the fuel tank that the selected GFS 10 is connected to.

Troubleshooting Fuel Gauge Type

When wired to a fuel gauge, the gauge type defaults to Auto Detect. If the fuel-level reading on your Garmin chartplotter or marine instrument
changes with the engine RPM, the GFS 10 could be detecting the wrong type of gauge.
Note: The fuel level changes with the motion of the boat. Perform this test when the boat is not moving.
To test the gauge-type setting:
1. When the boat is not moving, put the engine in neutral.
2. Use the throttle to increase the engine RPM. If the fuel-level reading changes with the engine RPM, change the gauge type.
To change the gauge-type setting:
1. While viewing the NMEA 2000 device configuration menu, select the GFS 10 device.
2. Select Config > Gauge Type.
3. Choose 1 Coil or 2 Coil and repeat the gauge-type setting test.

Troubleshooting the Fuel-Flow Reading

If the fuel-flow information received from the GFS 10 appears inaccurate, you can manually adjust the fuel-flow reading.
To adjust the fuel-flow reading:
1. While viewing the NMEA 2000 device configuration menu, select the GFS 10 device.
2. Select Config > Flow Adjustment.
3. Enter a positive or negative adjustment.

For example, when you set the Flow Adjustment to +10% , a flow reading of 20 gal./hr. (75 L/h) would change to a reading of 22 gal./hr.
(82.5 L/h), because 20 gal. × 110% = 22 gal. (75 L × 110% = 82.5 L).

Restoring Factory Default Settings

You can restore factory default settings to the GFS 10. You will lose all custom configuration and calibration settings when you restore factory
default settings.
To restore factory default settings:
1. While viewing the NMEA 2000 configuration menu, select the GFS 10 device.
2. Select Config > Factory Defaults.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

GRA 10 (Garmin Rudder Angle Adapter)

NOTE: This section provides specific configuration information for the GRA 10 adapter using your compatible Garmin display device. To
access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display device.

Calibrating the Rudder Angle

To use the GRA 10 adapter, you must calibrate the angle of the rudder that the adapter is associated with.
1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GRA 10 device.
3. Select an option:
• For most Garmin chartplotters, select Review > Rudder Angle Calibration.
• For other Garmin marine devices, select Config > Rudder Angle Calibration.
4. Follow the on-screen instructions to calibrate the starboard and port rudder angles.
5. Select OK when the calibration is complete.

Troubleshooting the Gauge Type

When connected to a gauge, the GRA 10 adapter gauge type is set to Auto Detect by default, and the adapter automatically detects the type of
gauge it is connected to. If the rudder-angle reading on a connected Garmin chartplotter or marine instrument changes with the engine RPM, the
adapter may be detecting the wrong type of gauge.
To test the gauge-type setting:
1. When the boat is not moving, put the engine in neutral.
2. Use the throttle to increase the engine RPM. If the rudder-angle reading changes with the engine RPM, change the gauge type.
To change the gauge type:
1. From the NMEA 2000 Devices list, select the GRA 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Gauge Type.
• For other Garmin marine devices, select Config > Gauge Type.
3. Select an option:
• To automatically detect the gauge type, select Auto Detect.
• To indicate a one-coil gauge, select 1 Coil.
• To indicate a two-coil gauge, select 2 Coil.
4. Perform the gauge-type setting test.

Configuring the GRA 10 Adapter if the Rudder Angle Calibration and Gauge Type Selections Are Not
Displayed

Depending on the version of software loaded on your Garmin marine instrument, the specific configuration options may not be displayed on the
configuration screens.
To calibrate the rudder angle if the menu option is not displayed:

To use the GRA 10 adapter, you must calibrate the angle of the rudder that the adapter is associated with.
1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GRA 10 device.
3. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
4. Move the rudder fully to starboard and observe the angle of the rudder position, in degrees.
5. Enter the following command: “RUDDERPOS=”
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Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

6. After the command, enter the angle of the starboard rudder position as a whole number greater than 0 and less than 180, in degrees,
followed by Done. For example, RUDDERPOS=45Done.
7. Center the rudder.
8. Enter the following command: “RUDDERPOS=0Done”
9. Move the rudder fully to port and observe the angle of the rudder position, in degrees.
10. Enter the following command: “RUDDERPOS=”
11. After the command, enter the angle of the port rudder position as a whole number less than 0 and greater than -180, in degrees, followed by
Done. For example, RUDDERPOS=-45Done.
To configure the gauge type if the menu option is not displayed:

When connected to a gauge, the GRA 10 adapter gauge type is set to Auto Detect by default, and the adapter automatically detects the type
of gauge it is connected to. When you troubleshoot the gauge-type setting, if the rudder-angle reading on a connected Garmin chartplotter or
marine instrument changes with the engine RPM, the adapter may be detecting the wrong type of gauge.
1. From the NMEA 2000 Devices list, select the GRA 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “GAUGRAYPE=”
4. After the command, enter one of the following options:
• To automatically detect the gauge type, enter 0, followed by Done. For example, GAUGRAYPE=0Done.
• To indicate a one-coil gauge, enter 1, followed by Done. For example, GAUGRAYPE=1Done.
• To indicate a two-coil gauge, enter 2, followed by Done. For example, GAUGRAYPE=2Done.

Restoring Factory Default Settings

You will lose all custom configuration settings when you restore factory default settings.
1. From the NMEA 2000 Devices list, select the GRA 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Select Yes.

GET 10 (Garmin Engine Tilt Adapter)

NOTE: This section provides specific configuration information for the GET 10 adapter using your compatible Garmin display device. To
access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display device.

Calibrating the Engine Tilt

To use the GET 10 adapter, you must calibrate the tilt of the engine with which the adapter is associated.
1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GET 10 device.
3. Select an option:
• For most Garmin chartplotters, select Review > Engine Tilt Calibration.
• For other Garmin marine devices, select Config > Engine Tilt Calibration.
4. Follow the on-screen instructions to calibrate the engine tilt.
5. Select OK when the calibration is complete.

Configuring the Engine Number

If your boat has multiple engines, you can indicate which engine each GET 10 adapter is associated with.
Technical Reference for Garmin NMEA 2000 Products

NMEA 2000-Certified Sensor Configuration Information

1. From the NMEA 2000 Devices list, select the GET 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Engine Number.
• For other Garmin marine devices, select Config > Engine Number.
3. Select the number of the engine that the adapter is associated with.
4. Select Done.

Troubleshooting the Gauge Type

When connected to a gauge, the GET 10 adapter gauge type is set to Auto Detect by default, and the adapter automatically detects the type of
gauge it is connected to. If the engine-tilt reading on a connected Garmin chartplotter or marine instrument changes with the engine RPM, the
adapter may be detecting the wrong type of gauge.
To test the gauge-type setting:
1. When the boat is not moving, put the engine in neutral.
2. Use the throttle to increase the engine RPM. If the engine-tilt reading changes with the engine RPM, change the gauge type.
To change the gauge type:
1. From the NMEA 2000 Devices list, select the GET 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Gauge Type.
• For other Garmin marine devices, select Config > Gauge Type.
3. Select an option:
• To automatically detect the gauge type, select Auto Detect.
• To indicate a one-coil gauge, select 1 Coil.
• To indicate a two-coil gauge, select 2 Coil.
4. Perform the gauge-type setting test.

Configuring the GET 10 Adapter if the Engine Tilt Calibration, Engine Number, and Gauge Type
Selections Are Not Displayed

To use the GET 10 adapter, you must calibrate the tilt of the engine that the adapter is associated with.
1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GET 10 device.
3. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
4. Set the engine tilt to the full-up position. The engine tilt is at 100%.
5. Enter the following command: “ENGINETILT=100Done”
6. Set the engine tilt to the full-down position. The engine tilt is at 0%.
7. Enter the following command: “ENGINETILT=0Done”
To configure the engine number if the menu option is not displayed:

If your boat has multiple engines, you can indicate which engine each GET 10 adapter is associated with.
1. From the NMEA 2000 Devices list, select the GET 10 device.
2. Select an option:

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “INSTANCE=”
4. After the command, enter a whole number between 1 and 253, which indicates the engine number, followed by Done. For example,
INSTANCE=2Done indicates that the adapter is associated with engine number 2.
To configure the gauge type if the menu option is not displayed:

When connected to a gauge, the GET 10 adapter gauge type is set to Auto Detect by default, and the adapter automatically detects the type of
gauge it is connected to. When you troubleshoot the gauge-type setting, if the engine-tilt reading on a connected Garmin chartplotter or marine
instrument changes with the engine RPM, the adapter may be detecting the wrong type of gauge.
1. From the NMEA 2000 Devices list, select the GET 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “GAUGETYPE=”
4. After the command, enter one of the following options:
• To automatically detect the gauge type, enter 0, followed by Done. For example, GAUGETYPE=0Done.
• To indicate a one-coil gauge, enter 1, followed by Done. For example, GAUGETYPE=1Done.
• To indicate a two-coil gauge, enter 2, followed by Done. For example, GAUGETYPE=2Done.

Restoring Factory Default Settings

You will lose all custom configuration settings when you restore factory default settings.
1. From the NMEA 2000 Devices list, select the GET 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Factory Defaults.
• For other Garmin marine devices, select Config > Factory Defaults.
3. Select Yes.

GFL 10 (Garmin Fluid Level Adapter)

NOTICE: This section provides specific configuration information for the GFL 10 adapter using your compatible Garmin display device. To
access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display device.

Configuring the NMEA 2000 Fluid Type

You can indicate the type of fluid that is in the tank with which each GFL 10 adapter is associated.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > N2K Fluid Type.
• For other Garmin marine devices, select Config > N2K Fluid Type.
3. Select a fluid type.
4. Select OK.

Configuring the Tank Number

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

• For other Garmin marine devices, select Config > Tank Number.
3. Select a tank number.
4. Select OK.

Configuring the NMEA 2000 Tank Capacity

You can indicate the capacity of the fluid tank that the GFL 10 adapter is associated with.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > N2K Tank Capacity.
• For other Garmin marine devices, select Config > N2K Tank Capacity.
3. Select the tank capacity.
4. Select Done.

Calibrating the Fluid Level

To use the GFL 10 adapter, you must calibrate the fluid level of the tank that the adapter is associated with, using a minimum of two calibration
points. The greater the number of fluid calibration points, the greater the accuracy of the reading on the fluid-level gauge.
1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GFL 10 device.
3. Select an option:
• For most Garmin chartplotters, select Review > Level Calibration > Add Calibration Point.
• For other Garmin marine devices, select Config > Level Calibration > Add Calibration Point.
4. Select the percentage of fluid currently in the tank, based on the total tank capacity.
5. Select Done.
6. Change the level of the fluid in the tank.
7. Select Add Calibration Point.
8. Select the percentage of fluid currently in the tank, based on the total tank capacity.
9. Select Done.
10. Repeat steps 6 through 9 to add additional, optional fluid-level calibration points.

Troubleshooting the Tank Number

If multiple GFL 10 adapters are assigned to the same NMEA 2000 fluid type, each adapter is assigned a unique tank number automatically. If
the “Invalid NMEA 2000 tank configuration” error message appears, you must assign a unique tank number to each adapter.
For example, if two adapters are assigned the NMEA 2000 fluid type value of Live Well and the error message appears, you must assign each
adapter a unique tank number.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Tank Number.
• For other Garmin marine devices, select Config > Tank Number.
3. Select a tank number.
4. Select OK.
Troubleshooting the Gauge Type

When connected to a gauge, the GFL 10 adapter gauge type is set to Auto Detect by default, and the adapter automatically detects the type of
gauge it is connected to. If the fluid-level reading on a connected Garmin chartplotter or marine instrument changes with the engine RPM, the
adapter may be detecting the wrong type of gauge.
NOTE: The fluid level changes when the boat is moving. Test the gauge-type setting when the boat is not moving.
30

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

To test the gauge-type setting:
1. When the boat is not moving, put the engine in neutral.
2. Use the throttle to increase the engine RPM. If the fluid-level reading changes with the engine RPM, change the gauge type.
To change the gauge type:
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Gauge Type.
• For other Garmin marine devices, select Config > Gauge Type.
3. Select an option:
• To automatically detect the gauge type, select Auto Detect.
• To indicate a one-coil gauge, select 1 Coil.
• To indicate a two-coil gauge, select 2 Coil.
4. Perform the gauge-type setting test.

Resetting the Fluid Level Calibration

You can reset the fluid-level calibration of the tank that the GFL 10 adapter is associated with.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Level Calibration.
• For other Garmin marine devices, select Config > Level Calibration.
3. Select Reset Calibration.
4. Select Yes.
5. Calibrate the fluid level.

Configuring the GFL 10 Adapter if the Tank Number and Fluid Type Selections Are Not Displayed

If your boat has multiple fluid tanks, you can indicate which tank each GFL 10 adapter is associated with.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “INSTANCE=”
4. After the command, enter a whole number between 1 and 16, which indicates the tank number, followed by Done.
For example, INSTANCE=2Done indicates that the adapter is associated with tank number 2.
To configure the fluid type if the menu option is not displayed:

You can indicate the type of fluid that is in the tank that each GFL 10 adapter is associated with.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “FLUIDTYPE=”
4. After the command, enter a number between 0 and 5 to indicate the fluid type as defined in the following table, followed by Done.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

For example, FLUIDTYPE=1Done indicates that the tank contains fresh water.
Fluid Type

FLUIDTYPE Value Fluid Type

FLUIDTYPE Value

Fuel

Live well

Fresh water

Oil

Waste water

Black water
(sewage)

Restoring Factory Default Settings

When you restore factory default settings, you will lose all custom configuration settings except fluid-level calibration.
1. From the NMEA 2000 Devices list, select the GFL 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Factory Defaults.
• For other Garmin marine devices, select Config > Factory Defaults.
3. Select Yes.

GBT 10 (Garmin Bennett Trim Tab Adapter)

NOTE: This section provides specific configuration information for the GBT 10 adapter using your compatible Garmin display device. To
access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display device.

Calibrating the Trim Tab Position

To use the GBT 10 adapter, you must calibrate the position of the trim tabs the adapter is associated with.
NOTE: If you only adjust your trim tabs within a limited range of motion on a regular basis, calibrate the GBT 10 adapter using your normal
range instead of the full range. Only the calibrated range will be displayed on your chartplotter or marine instrument.
1. From the NMEA 2000 Devices list, select the GBT 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Trim Tab Calibration.
• For other Garmin marine devices, select Config > Trim Tab Calibration.
3. Follow the on-screen instructions to calibrate the trim tab position.

Configuring the GBT 10 Adapter if the Trim Tab Calibration Selection Is Not Displayed

To use the GBT 10 adapter, you must calibrate the position of the trim tabs that the adapter is associated with. You can enter a minimum of two,
and a maximum of sixteen, trim tab positions. For greater accuracy, enter more trim tab positions.
1. While viewing the NMEA 2000 configuration menu, select the GBT 10 device.
2. Select Config > Generic Configuration.
3. Enter the following command: “CALIBRATION=1”
4. Move both trim tabs to the highest position. When the trim tabs are in the highest position, they should be at or near 0% of their full range of
motion.
5. Enter the following command: “TRIMTABPOS=”
6. After the command, enter the percentage of the highest trim tab position as a whole number between 0 and 100, and select Done. For
example, TRIMTABPOS=0Done.
7. Move both trim tabs to the lowest position. When the trim tabs are in the lowest position, they should be at or near 100% of their full range of
motion.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

8. Enter the following command: “TRIMTABPOS=”
9. After the command, enter the percentage of the lowest trim tab position as a whole number between 0 and 100, and select Done. For
example, TRIMTABPOS=100Done.
10. To enter an additional, optional trim tab position, move both trim tabs to a new position, and observe the trim tab position as a percentage of
the full range of motion of the trim tab.
11. Enter the following command: “TRIMTABPOS=”
12. After the command, enter the percentage of the trim tab position as a whole number between 0 and 100, and select Done. For example,
TRIMTABPOS=50Done.
13. Repeat steps 10 through 12 to enter additional, optional trim tab positions.

Restoring Factory Default Settings

You will lose all custom configuration settings when you restore factory default settings.
1. From the NMEA 2000 Devices list, select the GBT 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Factory Defaults.
• For other Garmin marine devices, select Config > Factory Defaults.
3. Select Yes.

GST 10 (Garmin Water Speed and Temperature Adapter)

NOTE: This section provides specific configuration information for the GST 10 adapter using your compatible Garmin display device. To
access the NMEA 2000 configuration menu on your display device, consult the documentation provided with your display device.

Calibrating the Water Speed

To use the GST 10 adapter, you must calibrate the water speed.
1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Calibrate Water Speed.
• For other Garmin marine devices, select Config > Calibrate Water Speed.
3. Follow the on-screen instructions to calibrate the water speed.

Assigning a NMEA 2000 Temperature Source

To use the GST 10 adapter, you must select the source for the temperature data.
1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > N2K Temp. Source.
• For other Garmin marine devices, select Config > N2K Temp. Source.
3. Select the location of the temperature sensor.

Configuring the Temperature Offset

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

4. Select Done.

Troubleshooting the Sensor Number

Configuring the GST 10 Adapter if the Water Speed, Location, Temperature Offset, and Sensor Number
Selections Are Not Displayed

To use the GST 10 adapter, you must calibrate the water speed.

1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Ensure that the boat is stationary; the engine should be off or idling.
4. Enter the following command: “WATERSPEED=0Done”
5. Accelerate the boat to cruising speed and observe the maximum speed, in miles per hour.
6. Bring the boat to a stop; the engine should be off or idling.
7. Enter the following command: “WATERSPEED=”
8. After the command, enter a positive decimal number that indicates the maximum cruising speed in miles per hour, followed by Done. For
example, WATERSPEED=35.5Done.
To configure the temperature source if the location menu option is not displayed:

To use the GST 10 adapter, you must select the source for the temperature data.

1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “TEMPSOURCE=”
4. After the command, enter a number between 0 and 8, or 13, to indicate the source of the temperature data as defined in the following table,
followed by Done.
For example, TEMPSOURCE=6Done indicates that the bait well is the source for the temperature data.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

Location

TEMPSOURCE Value

Location

TEMPSOURCE Value

Water

Live well

Air outside

Bait well

Air inside

Refrigeration

Engine room

Heating system

Main cabin

Freezer

To configure the temperature offset if the menu option is not displayed:

If the temperature data displayed on the gauge connected to the GST 10 adapter is not the same as temperature data displayed on other devices,
you can configure the temperature offset to increase or decrease the displayed temperature by a specific amount.
1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “TEMPOFFSET=”
4. After the command, enter a positive or negative decimal number, followed by Done.
For example, TEMPOFFSET=-2.5Done indicates that the temperature readings displayed on the gauge connected to the GST 10 adapter
will be decreased by 2.5 degrees Celsius.
To configure the sensor number if the menu option is not displayed:

If multiple GST 10 adapters are assigned to the same NMEA 2000 temperature source, each adapter is assigned a unique sensor number
automatically. If the “Invalid NMEA 2000 temperature configuration” error message appears, you must assign a unique sensor number to each
adapter.
For example, if two adapters are assigned the NMEA 2000 temperature source value of Live Well and the error message appears, you must
assign each adapter a unique number.
1. From the NMEA 2000 Devices list, select one of the GST 10 devices assigned to the same temperature source.
2. Select an option:
• For most Garmin chartplotters, select Review > Generic Config.
• For other Garmin marine devices, select Config >Generic Configuration.
3. Enter the following command: “INSTANCE=”
4. After the command, enter a positive decimal number, followed by Done.
5. Repeat steps 1–4 for each GST 10 device assigned to the same temperature source.
For example, if two GST 10 adapters are assigned the value of Live Well, assigning INSTANCE=1 to the first adapter and assigning
INSTANCE=2 to the second adapter prevents the error message.

Restoring Factory Default Settings

You will lose all custom configuration settings when you restore factory default settings.
1. From the NMEA 2000 Devices list, select the GST 10 device.
2. Select an option:
• For most Garmin chartplotters, select Review > Factory Defaults.
• For other Garmin marine devices, select Config > Factory Defaults.
3. Select Yes.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

Intelliducer (Intelligent Depth Transducer–Transom Mount and Thru-Hull)
Setting the Keel Offset

Adjust the Keel Offset to display a depth reading from the water line or from the lowest point of the boat (keel) rather than the actual location
of the Intelliducer.
To adjust the keel offset:
1. While viewing the NMEA 2000 device configuration menu, select a specific Intelliducer and select Config > Keel Offset.
2. Enter the measured distance from the Intelliducer location to the water line or to the keel of the boat.
• If you are measuring down to the keel (Intelliducer installed at the water line), enter a (+) positive number.
• If you are measuring up to the water line (Intelliducer installed on the keel), enter a (-) negative number.

Intelliducer at the water line
Enter a (+) positive number
to show depth at the
bottom of the keel.
Intelliducer at the bottom
of the keel
Enter a (-) negative
number to show depth at
the surface.
Keel Offset

GWS 10 (Garmin Wind Sensor)

Configuring the Wind Angle Offset (Orientation)

When mounting the sensor, you must adjust the angle offset if you did not orient the GWS 10 as described in the GWS 10 Installation
Instructions.
To configure the wind angle offset (orientation):
1. While viewing the NMEA 2000 device information, select Config > Wind Angle Offset.
2. Select the angle in degrees to adjust for the difference in orientation.
Tip: The angles are configured clockwise around the mast of the boat. For example, 90 degrees is on the starboard side of the boat, and 270 degrees is
on the port side.

Configuring the Wind Speed Filter

The wind speed filter governs how quickly the NMEA 2000-compatible display device shows a change in the wind speed. A lower filter setting
shows changes in the wind speed more gradually, and may stabilize the display.
To configure the wind speed filter:
1. While viewing the NMEA 2000 device information, select Config > Wind Speed Filter.
2. Choose from the following options to adjust the filter settings.
• Off—the wind speed data is not filtered.
• On—select a lower number to show a change in the wind speed more gradually, and help the gauge needle or wind speed number to
move or change more steadily.
• Auto—automatically adjusts the filter settings based on wind conditions.

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

Configuring the Wind Angle Filter

The wind angle filter governs how quickly the NMEA 2000-compatible display device shows a change in the wind angle. A lower filter setting
shows changes in the wind angle more gradually, and may stabilize the display.
To configure the wind angle filter:
1. While viewing the NMEA 2000 device information, select Config > Wind Angle Filter.
2. Choose from the following options to adjust the filter settings.
• Off—the wind angle data is not filtered.
• On—select a lower number to update the display device less often, and help the gauge needle or wind angle number to move or change
more steadily.
• Auto—automatically adjusts the filter settings based on wind conditions.

Configuring the GWS 10 if the Filter and Offset Selections Are Not Displayed

Depending on the version of software loaded on your Garmin marine instrument, the specific configuration options may not be displayed on the
configuration screens.
To configure the wind angle offset if the menu option is not displayed:
1. Select Generic Configuration to specify data for the filter and offset settings.
2. Enter the following command: “ANGLEOFFSET=”
3. Follow the command with a number between 0 and 359, in degrees (for example: ANGLEOFFSET=180).
To configure the wind angle filter if the menu option is not displayed:
1. Select Generic Configuration to specify data for the filter and offset settings.
2. Enter the following command: “ANGLEFILTER=”
3. Follow the command with a number between 0 and 254, representing a time constant in increments of 0.25 second, or 255 to represent the
Automatic setting (for example: ANGLEFILTER=12).
To configure the wind speed filter:
1. Select Generic Configuration to specify data for the filter and offset settings.
2. Enter the following command: “SPEEDFILTER=”
3. Follow the command with a number between 0 and 254, representing a time constant in increments of 0.25 second, or 255 to represent the
Automatic setting (for example: SPEEDFILTER=215).

Technical Reference for Garmin NMEA 2000 Products

NMEA 2000 Checklist

Use this checklist to confirm your NMEA 2000 installation.
Is the NMEA 2000 network connected to power, and is the power balanced correctly on the network? (page 5)
Is the NMEA 2000 network power connected through the ignition switch–if not, did you install a switch? (page 5)
Is the NMEA 2000 power cable grounded? Is the bare wire connected to the same ground location? (page 5)
Is the NMEA 2000 network backbone built using linear construction? (page 4)
Are there terminators on both ends of the NMEA 2000 network? (page 7)
Are all drop cables less than 20 ft. (6 m)? (page 8)

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

© 2009–2012 Garmin Ltd. or its subsidiaries
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No. 68, Zhangshu 2nd Road, Xizhi Dist., New Taipei City, 221, Taiwan (R.O.C.)
www.garmin.com
March 2012

Part Number 190-00891-00_0D

Printed in Taiwan

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Garmin Ghc 20 Control Unit Technical Reference Guide

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