NMEA 2000 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.

This device can connect to a NMEA 2000 network on your boat to share data from NMEA 2000 compatible devices such as a GPS antenna or a VHF radio. The included NMEA 2000 cables and connectors allow you to connect the device to your existing NMEA 2000 network. If you do not have an existing NMEA 2000 network you can create a basic one using cables from Garmin®.

If you are unfamiliar with NMEA 2000, you should read the Technical Reference for NMEA 2000 Products at garmin.com/manuals/nmea_2000.

The port labeled NMEA 2000 is used to connect the device to a standard NMEA 2000 network.

Wiring diagram with callouts



Callout number one

NMEA 2000 compatible Garmin device

Callout number two

GPS antenna

Callout number three

Ignition or in-line switch

Callout number four

NMEA 2000 power cable

Callout number five

NMEA 2000 drop cable

Callout number six

12 Vdc power source

Callout number seven

NMEA 2000 terminator or backbone cable

Callout number eight

NMEA 2000 T-connector

Callout number nine

NMEA 2000 terminator or backbone cable

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