Packing List, Accessories, and Tools Needed

Before installing your unit, confirm that your package includes the following items. If any parts are missing, contact your Garmin dealer immediately.

Standard Package

•GXM 51 Antenna

•Surface-mount bracket

•Pole-mount bracket

•Under-deck mount bracket

•Mounting hardware (screws and adhesive pads)

•NMEA 2000 T-connector

•NMEA 2000/audio cable 19 ft., 8 in. (6 m)

•Audio adapter cable 1 ft. (30.5 cm)

•Installation instructions

Optional Accessories

•Additional NMEA 2000 network components

•Audio adapter cable extensions

Tools Needed

•Drill

•Drill bits—1/8in. (3 mm) and 3/4 in.

(19 mm)

•Hole saw, 1 in. (25 mm)—surface-mount cable hole

•Screwdriver—surface-mount screws

•Pencil (to mark surface-mount pilot holes)

•Countersink bit (when mounting on fiberglass)

•Marine sealant (for some mounting options)

Step 1: Mount the GXM 51 Antenna

You can surface mount the GXM 51 antenna, attach it to a standard 1 in. OD pipe-threaded-pole marine mount (14 threads-per-inch—not included), or even install the antenna under fiberglass.

Select a suitable location for the GXM 51 antenna on your boat. To ensure the best reception, mount the GXM 51 antenna in a location that has a clear, unobstructed view of the sky in all directions.

•Avoid mounting the GXM 51 antenna where it is shaded by the superstructure of the boat, a radome antenna, or a mast.

•On a sailboat, avoid mounting the GXM 51 antenna high on the mast.

•The GXM 51 antenna provides more-stable reception when located nearer to water level.

Better

Best

 

Good

EMI

EMI (Electromagnetic Interference)

from engine components

Above - best

 

Below - OK

3 ft.

(1 m)

Radar

VHF Radio Antenna

GXM 51 Placement Considerations

• Mount the GXM 51 antenna at least 3.3 ft. (1 m) away from (preferably above) the path of any radar beam or a VHF radio antenna.

Temporarily secure the antenna in the preferred mounting location and test it for correct operation. If you experience interference with other electronics, try a different location. After verifying correct operation, permanently mount the antenna.



GXM 51 Installation Instructions