1. INSTALLATION
2
1.3 Choosing the Mounting Location
For a reliable GPS signal, selecting the best location for the receiver is very important. It can be
mounted on a pole, rail, or flat surface. Choose a location that balances the requirements below.
• The GPS receiver must have a clear view of the sky to the horizon in all directions. Note that
frozen water spray may degrade reception.
• Referring to the figure below for distances, mount away from any VHF radio, satellite commu-
nications equipment, radar, or other antennas to avoid mutual interference.
• Mount above or below any radar beam. Do not mount within a radar beam.
• Mount reasonably level with the earth’s surface -- not tilted to one side.
• Do not mount on top of a sailboat mast. The sway will cause jitter in the data.
• Do not mount where the GPS receiver could be a tripping hazard or tread upon.
• Be sure there is access to the underside of the mounting surface.
• Be sure the cable(s) can be routed to reduce electrical interference from other electrical wiring
and any equipment with a strong magnetic field such as radar, radio transmitters, engines, gen-
erators, etc. Separate the cables by at least 1 meter (3 feet).
not within
INMARSAT beam
VHF antenna
or RX MF/HF
whip antenna
Loop
antenna
GPS receiver
TX whip
antenna
(MF/HF)
INMARSAT
antenna
Long-wire
TX MF/HF
antenna
Min. 3 m
not within
radar beam
Min. 1 m
Min. 4 m
Min. 1 m
Min. 5 m
Min. 1.5 m
Min. 5 m
Radar
Min. 4 m
B-, F-type: 25°
C-type: 15°
Antenna
insulator
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