GXM 51 Installation Instructions
To mount the GXM 51 with the cable routed through the pole:
1. Position a standard 1 in. OD pipe-threaded-pole marine mount (14 threads per inch—not
included) in the preferred location, and mark the approximate center of the pole.
2. Drill a hole using a
3
/
4
in. (19 mm) drill bit for the cable to pass through.
3. Fasten the pipe-threaded pole marine mount to the boat.
4. Thread the pole-mount adapter onto the pole. Do not overtighten the adapter.
5. Route the NMEA 2000/audio cable through the pole and connect it to the GXM 51 antenna.
6. Place the GXM 51 antenna on the pole-mount adapter
➊
and twist it clockwise to lock it in
place
➋
.
7. Secure the antenna to the adapter with the included M3 set screw
➌
.
8. (Optional) With the GXM 51 installed on the pole mount, fill the vertical cable slot with a
marine sealant (not included).
9. Route the NMEA 2000/audio cable away from sources of electronic interference, and
connect it to your NMEA 2000 network and to the audio input of your stereo receiver
).
Under-deck-mounting the GXM 51 Antenna
The GXM 51 can be mounted under a fiberglass surface with the adhesive pads attached to the
under-deck mounting bracket. The GXM 51 will not acquire satellite signals through metal—
you can only use the under-deck mount under a fiberglass surface.
1. Determine the location on the
fiberglass surface where you
want to mount the GXM 51.
2. Place the adhesive pads on
the under-deck mounting
bracket.
3. Place the GXM 51 in the
under-deck mounting bracket.
4. Adhere the under-deck
mounting bracket to the
mounting surface.
5. Secure the under-deck mount
to the mounting surface with
screws. Use extreme care to ensure that the screws do not penetrate the upper surface of
the deck.
6. Connect the NMEA 2000/audio cable to the GXM 51.
7. Route the NMEA 2000/audio cable away from sources of electronic interference, and
connect it to your NMEA 2000 network and to the audio input of your stereo receiver (see
step 3 below).
GXM 51
antenna
Under-deck
mounting bracket
Mounting
surface
Adhesive
pads
GXM 51
antenna
Under-deck
mounting bracket
Mounting
surface
Adhesive
pads
