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Simrad AP20 Autopilot
66 20220505H
4.13 RFC35 Fluxgate Compass installation
Figure 4-11
RFC35 mounting
The heading sensor is the most important part of the AP20
system and great care should be taken when deciding the
mounting location. As the heading is displayed on the AP20
Control Unit, the heading sensor can be mounted at a remote
location.
Note ! An autopilot fluxgate compass or magnetic compass should not
be installed on the fly bridge or in the mast.
The RFC35 compass can be mounted on deck or bulkhead,
athwartship or alongship. The heading offset feature in the AP20
will compensate for the mechanical offsets that may be a result
of the selected location and orientation of the RFC35.
If the RFC35 is deck or bulkhead mounted athwartship with the
cable gland pointing aft, little if any offset correction is required.
With the cable gland pointing forward a 180° correction is
required.
When mounting RFC35 on a bulkhead alongship, a +90° or –
90° correction is needed dependent on whether it is port or
starboard bulkhead.
Note ! Offset correction is performed after the calibration (see
paragraph 4.32).
Find a location that provides a solid mounting place free from
vibration, and as close to the vessel's centre of roll and pitch as
possible, i.e. close to the water line. It should be as far as
possible from disturbing magnetic influences such as the engines
(min. 2 meters), engine ignition cables, other large metal objects
and particularly the drive unit.
68


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