Installing The Gpsmap 492/498 External Gps Antenna - Garmin GPSMAP 392, 398, 492, 498 Owner's Manual

Installing the GPSMAP 492/498 External
GPS Antenna
The GPSMAP 492/498 with external antenna must be properly
installed according to the following instructions to get the
best possible performance. To complete the external antenna
installation, you need the appropriate fasteners and a 1" x 14-thread
marine antenna mount available at most marine dealers.
The GPSMAP 492/498 with internal antennas do not require this
installation. To acquire satellites, install the unit with a clear view
of the sky.
Mounting the GPS Antenna
(External Antenna Units Only)
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.
GPSMAP 392/398/492/498 Owner's Manual
A > I GPSMAP 492/498 E
PPENDIX NSTALLING THE
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.
GPS A
XTERNAL NTENNA
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