Garmin GXM 51 GXM 51 Installation Instructions - Page 4

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 (see page 5). 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. Adhesive pads 2. Place the adhesive pads on the under-deck mounting bracket. 3. Place the GXM 51 in the under-deck mounting bracket. Mounting surface 4. Adhere the under-deck mounting bracket to the mounting surface. 5. Secure the under-deck mount to the mounting surface with GXM 51 antenna Under-deck mounting bracket 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 Installation Instructions