Garmin GPSMAP 188C Owners Manual - Page 102
Appendix - internal antenna
UPC - 753759031923
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Appendix A Antenna Installation Suggested locations for mounting the GA 29 antenna. It is possible to route the coaxial cable either through or outside the antenna mount. It is possible to remove the BNC connector on the coaxial cable and shorten the coaxial cable to ease installation, however, doing so will void the antenna warranty. If the BNC connector is removed it must be replaced with a new solder-on or crimp BNC (RG 58 or 59 compatible) connector. 92 Installing the GPSMAP 188/188C/238 Sounder The GPSMAP 188/188C/238 Sounder must be properly installed according to the following instructions to get the best 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 188 with an internal antenna, skip to the next page.) 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 will be shaded by the boat's superstructure, 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 readings caused by excessive heeling. Most marine VHF and LORAN antennas do 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. 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, and sealant to secure the cable along the route and through any bulkhead or deck. 3. Once the GPSMAP 188/188C/238 Sounder 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.