3
GMI 10 Installation Instructions
7. Place the GMI 10 into the cutout.
8. Securely tighten the four mounting screws through the GMI 10 into the drilled mounting holes.
NOTE:
Stainless-steel screws may bind when screwed into fiberglass and overtightened. Garmin recommends
applying an anti-galling, stainless anti-seize lubricant to the screw before using.
9. Install the mounting covers by snapping them into place.
Step 3: Connect the GMI 10 to Sensors and to Power
The GMI 10 can connect to sensors using either NMEA 2000 or NMEA 0183.
Connecting the GMI 10 through NMEA 2000
The GMI 10 is packaged with the necessary NMEA 2000 connectors and
cable to either connect the GMI 10 to your existing NMEA 2000 network or
to build a basic NMEA 2000 network. For more information on NMEA 2000,
visit
. Follow the directions and reference the diagrams on
to either connect the GMI 10 to your existing NMEA 2000 network or
to build a basic NMEA 2000 network.
To connect the GMI 10 to your existing NMEA 2000 network:
1. Determine where you would like to connect the GMI 10 to your existing
NMEA 2000 backbone.
2. Disconnect one side of a NMEA 2000 T-connector from the backbone at
an appropriate location.
If you need to extend the NMEA 2000 backbone, connect an appropriate
NMEA 2000 backbone extension cable (not included) to the side of the T-connector you disconnected.
3. Add the included T-connector for the GMI 10 in the NMEA 2000 backbone by connecting it to the side of the
T-connector you disconnected.
4. Route the included drop cable to the bottom of the T-connector you just added to your NMEA 2000 network.
If the included drop cable is not long enough, you can use a drop cable up to 20 ft. (6 m) long (not included).
5. Connect the drop cable to the T-connector and the GMI 10.
Notice
If you have an existing NMEA 2000 network on your boat, it should already be connected to power. Do not connect
the included NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be
connected to a NMEA 2000 network.
To create a basic NMEA 2000 Network
1. Connect the two T-connectors together by their sides.
2. The included NMEA 2000 power cable must be connected to a 12 Vdc power source through a switch. Connect to
the ignition switch of the boat if possible, or through an appropriate additional switch (not included).
3. Connect the NMEA 2000 power cable to one of the T-connectors.
4. Connect the included NMEA 2000 drop cable to the other T-connector and to the GMI 10.
5. Add additional T-connectors for each sensor (not included) you want to add to the NMEA 2000 network, and connect
each sensor to a T-connector with the appropriate drop cable (not included).
6. Connect the appropriate terminators to each end of the combined T-connectors.
Notice
You must connect the included NMEA 2000 power cable to the ignition switch of the boat, or through an external
switch. The GMI 10 will drain your battery if it is connected directly.
NMEA 0183
Data
NMEA 2000
