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2 INSTALLATION<br />
2.1 Mounting Considerations<br />
2.1.1 Antenna unit<br />
General<br />
• Keep the length of the antenna cable in mind when selecting a mounting<br />
location.<br />
Installing the antenna above superstructures<br />
• The antenna must be mounted above all other structures on the vessel to<br />
obtain an unobstructed view of the satellites regardless of vessel heading.<br />
Failure to do so will cause shadows and multipath reflection problems.<br />
Mast<br />
SC-series Antenna<br />
Radar Antenna<br />
Bridge<br />
Example of antenna installed above all superstructures<br />
Installing the antenna below superstructures<br />
If it is not possible to mount the<br />
antenna above all superstructures on<br />
the vessel, as shown in the illustration<br />
above, shading and multipath<br />
problems may occur on at least one<br />
heading, and possibly more. To<br />
possibly avoid those problems,<br />
observe the guidelines in this section.<br />
NOTICE<br />
If the antenna is installed below any<br />
superstructure, the installation must<br />
be done over a two-day period, following<br />
the procedure in the service manual.<br />
At least 12 hours are required to capture<br />
tracking data to measure multipath indexes<br />
and locate areas of shading.<br />
2-1
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