Garmin GPS 152 - Manual (Page 90)

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Appendix G
Antenna Installation
Installing the GPS 152
The GPS 152 must be properly installed according to the following instructions to get the best
possible performance. If you have the GPS 152 with the built-in internal bail mount antenna, you may
skip this section and proceed to the next page. For units purchased with the external GA 29 antenna,
follow the instructions below. To complete the installation, you’ll need the appropriate fasteners and a
1” x 14-thread marine antenna mount available at most marine dealers.
Mounting the GPS Antenna
The antenna should be mounted in a location that has a clear, unobstructed view of the sky in all
directions and as far away from interference as possible to ensure the best reception. Avoid mounting
the antenna where it will be 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. It is a good idea to temporarily place the antenna and unit in the desired mounting
location and test any other nearby electronics to see if they interfere with the GPS unit. 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.
To install the GPS antenna:
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,
fasteners and sealant to secure the cable along the route and through any bulkhead or deck.
3. Once the GPS 152 unit has been installed, connect the cable to the antenna connector 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.
It is possible to route the coaxial cable either through or out-
side the antenna mount. The BNC connector on the coaxial
cable can be removed, and the coaxial cable shortened to
ease installation. If the BNC connector is removed it must
be replaced with a new BNC connector.
Suggested locations for mounting the GA 29 antenna.
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