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GPSMAP 188/188C Sounder Owner’s Manual 93
APPENDIX > INSTALLING THE GPSMAP 188/188C SOUNDER
Installing the GPSMAP 188/188C Sounder
The GPSMAP 188/188C Sounder must be properly installed
according to the following instructions to get the best possible
performance. To complete the installation, you 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 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.
Suggested locations for mounting the external antenna.
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.
NOTE: 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 the coaxial cable shortened
to ease installation, however,
doing so voids the antenna
warranty. If the BNC connector
is removed, it must be replaced
with a new solder-on or crimp
BNC connector.