Garmin 190-01030-02 User Manual

Before installing your unit, confirm that your package includes the following items. If any parts 

are missing, contact your Garmin dealer immediately.

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

Additional NMEA 2000 network 

components
Audio adapter cable extensions

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Drill
Drill bits—

1

/

8

 in. (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)

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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.
 Mount the GXM 51 antenna at least 3.3 ft. (1 m) away from (preferably above) the 

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.

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SS BARNET

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SS BARNET

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