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Connection Considerations

The marine instrument connects to power and to data sources

through a NMEA 2000 network.

Although the instrument cannot directly receive NMEA 0183

data, it can display NMEA 0183 data from sources connected to

a GNX 20 or GNX 21 device (sold separately) on the same

NMEA 2000 network.

The instrument can also receive data from Nexus

and sensors using a GND

™

NMEA 2000 Connection Considerations

If you are connecting to an existing NMEA 2000 network,

identify the NMEA 2000 power cable. Only one NMEA 2000

power cable is required for the NMEA 2000 network to operate

properly.

A NMEA 2000 Power Isolator (010-11580-00) should be used in

installations where the existing NMEA 2000 network

manufacturer is unknown.

If you are installing a NMEA 2000 power cable, you must

connect it to the boat ignition switch or through another in-line

switch. NMEA 2000 devices will drain your battery if the NMEA

2000 power cable is connected to the battery directly.

The marine instrument connects to a NMEA 2000 network on

your boat. The NMEA 2000 network provides power to the

marine instrument and data from NMEA 2000 devices such as a

wind sensor. The included NMEA 2000 cables and connectors

allow you to either connect the device to your existing NMEA

2000 network or create a basic NMEA 2000 network if needed.

If you are unfamiliar with NMEA 2000, you should read the

"NMEA 2000 Network Fundamentals" chapter of the Technical

Reference for NMEA 2000 Products. To download the

reference, go to garmin.com/manuals/nmea_2000.

instruments

10 device (sold separately).

NOTICE

Wind transducer

GND 10 black box bridge

Marine instrument

Ignition or in-line switch

NMEA 2000 power cable

NMEA 2000 drop cable

Power source

NMEA 2000 terminator or backbone cable

NMEA 2000 T-connector

NMEA 2000 terminator or backbone cable

NMEA 0183 Connection Considerations

• The marine instrument can receive NMEA 0183 data from

one device using a NMEA data cable (not included), but it

cannot transmit data from the NMEA 0183 device to the

NMEA 2000 network.

• If you are replacing a legacy Garmin marine instrument that

currently uses a NMEA data cable, you do not need to

purchase a new data cable, but you might need to replace

the quarter-turn locking ring with a threaded locking ring. See

your local Garmin dealer or

information.

• The installation instructions provided with your NMEA 0183

compatible device should contain the information you need to

identify the transmitting Tx/A (Out +) and Tx/B (Out -) wires.

• When connecting NMEA 0183 devices with two transmitting

wires, it is not necessary for the NMEA 2000 bus and the

NMEA 0183 device to connect to a common ground.

• When connecting a NMEA 0183 device with only one

transmitting Tx (Out) wire, the NMEA 2000 bus and the

NMEA 0183 device must connect to a common ground.

• For extended runs, you should use at least 0.33 mm

(22 AWG) wire.

• You must solder and seal all connections with heat-shrink

tubing.

Wire Color Wire Function

Red

A red wire is present only on some variations of the data

cable, and should not be connected.

Black

Accessory (-). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

Yellow

Accessory (+). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

Blue

Tx/A (Out +). This wire is used only when connecting the

marine instrument to a Garmin HVS GPS antenna.

www.garmin.com

for more

GNX 20/21 Installation Instructions