12. INSTALLATION
12-2
12.2 Installation of Antenna Unit
Mounting considerations
The antenna unit GPA-017/017S (option) is available for receiving GPS signal with far-
ther sensitivity.
Select a suitable mounting location considering the following:
• Select a location out of the radar beam. The radar beam will obstruct or prevent re-
ception of the GPS satellite signal.
• The location should be well away from a VHF antenna. A GPS receiver is interfered
by a harmonic wave of a VHF antenna.
• There should be no interfering object within the line-of-sight to the satellites. Objects
within line-of-sight to a satellite, for example, a mast, may block reception or prolong
acquisition time.
• Mount the antenna unit as high as possible. Mounting the antenna unit as high as
possible keeps it free of interfering objects and water spray, which can interrupt re-
ception of GPS satellite signal if the water freezes.
• If the antenna cable is to be passed through a hole which is not large enough to
pass the connector, you may unfasten the connector with a needle nose pliers and
3/8-inch open-end wrench. Refasten it as shown below after running the cable
through the hole.
• If the internal GPS antenna is used, be sure there are no obstructions above or
around the display unit.
Washer
Clamp nut
Gasket (reddish brown)
Shield
Center pin (soldered)
Connector shell
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