Garmin GPSMAP 178 Owner's Manual

Also see for GPSMAP 178 Sounder: Specifications

Contents

Garmin GPSMAP 178 Owner's Manual Manual pdf 102 page image

Appendix AAntenna InstallationInstalling the GPSMAP 178/178CThe GPSMAP 178/178C must be properly installed according to the following instructions to get thebest possible performance. To complete the installation, you’ll need the appropriate fasteners and a 1”x 14-thread marine antenna mount available at most marine dealers. (If you have a GPSMAP 178/178Cwith an internal antenna, skip to the next page.) When in doubt, seek professional assistance.Mounting the GPS AntennaThe antenna should be mounted in a location that has a clear, unobstructed view of the sky in alldirections to ensure the best reception. Avoid mounting the antenna where it is shaded by the boat’ssuperstructure, a radome antenna, or mast. Keep the antenna away from the path of a radar’s beam.Sailboat users should avoid mounting the antenna high on the mast to prevent inaccurate speed readingscaused by excessive heeling. Most marine VHF and LORAN antennas do not seriously degrade the GPSantenna’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 needto raise the antenna to avoid shading, try using a 1” x 14-thread extension mast available at most marinedealers.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 appropriate tie-wraps, fasteners, andsealant to secure the cable along the route and through any bulkhead or deck.3. Once the GPSMAP 178/178C unit has been installed, connect the cable to the antenna connector onthe back of the display unit. Make sure that you turn the antenna cable connector 1/4 turn clockwiseto lock the cable into place.It is possible to route the coaxial cable either through oroutside the antenna mount. It is possible to remove the BNCconnector on the coaxial cable and shorten the coaxial cableto ease installation, however, doing so voids the antennawarranty. If the BNC connector is removed it must bereplaced with a new solder-on or crimp BNC (RG 58 or 59compatible) connector.Suggested locations for mounting the GA 29 antenna.