Garmin gpsmap 172 Manuale Utente

Installing the GPSMAP 172/172C

The GPSMAP 172/172C must be properly installed according to the following instructions to get 

the best possible performance. If you have the GPSMAP 172/172C with the built-in internal antenna, 
you may skip this section and proceed to the next page. For units purchased with the remote GA 29 
antenna, follow the instructions below. To complete the installation, you’ll need the appropriate fasten-
ers and a 1” x 14-thread marine antenna mount available at most marine dealers. When in doubt, 
seek professional assistance.

Mounting the GPS Antenna

The antenna should be mounted in a location that has a clear, unobstructed view of the sky in all 

directions to ensure the best reception. Avoid mounting the antenna where it is shaded by the boat’s 
superstructure, a radome antenna, or mast. Sailboat users should avoid mounting the antenna high 
on the mast to prevent inaccurate speed readings caused by excessive heeling. Most marine VHF and 
LORAN antennas should not seriously degrade the GPS antenna’s reception. Never paint the antenna or 
clean it with harsh solvents.

The Garmin antenna screws directly onto any standard 1” x 14-thread antenna mount. If you 

need to raise the antenna to avoid shading, try using a 1” x 14-thread extension mast available at most 
marine dealers.

1.   Screw the antenna directly onto the 1” x 14-thread mount.
2.   Route the cable to the mounting location of the display unit. Use the appropriate tie-wraps, fasten-

ers and sealant to secure the cable along the route and through any bulkhead or deck.

3.   Once the GPSMAP 172/172C unit has been installed, connect the cable to the antenna connec-

tor on the back of the display unit. Make sure that you turn the antenna cable connector 1/4 turn 
clockwise to lock the cable into place.

88