Garmin NMEA 2000 Satellite Radio User Manual


 
2
GXM 51 Installation Instructions
Packing List, Accessories, and Tools Needed
Before installing your unit, conrm 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
/
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
berglass)
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 berglass.
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.


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.
SS BARNETT
Radar
VHF Radio Antenna
3 ft.
(1 m)
Above - best
Below - OK
EMI (Electromagnetic Interference)
from engine components
Best
Better
Good
EMI
GXM 51 Placement Considerations
SS BARNETT
Radar
VHF Radio Antenna
3 ft.
(1 m)
Above - best
Below - OK
EMI (Electromagnetic Interference)
from engine components
Best
Better
Good
EMI
GXM 51 Placement Considerations