Simrad AP21 and AP22 Autopilots
102 20220596G
If the compass is close to disturbing magnetic objects, the
compass calibration may fail, and the display will show:
RFC compass
Failed
Try a second calibration. If it still fails, move the compass to a
better location and re-calibrate.
After calibration, check the compass readout against a known
reference, other compass or leading line. If the reading is correct
(+/-3°) except for a fixed offset, proceed to next menu item by
pressing STBD [>] button.
Compass Offset
Note ! Offset correction is always performed after the calibration.
The compass OFFSET feature allows you to correct for a
constant compass heading offset that may be present as a result
of the compass being installed with a lubber line offset or a fixed
offset remains after the calibration procedure has been
completed. The value of compass offset is specific to the heading
sensor that is selected at the time the offset is entered. (For
multiple heading sensor offset procedure, refer to separate
CI300X manual).
The following display is presented when accessing the
COMPASS OFFSET screen:
Compass
Offset 000°
Heading 345°
Dial in the correction by turning the course knob to offset the
compass heading to agree with a known heading or bearing. The
offset value can be either positive or negative.
Note ! If an OFFSET still exists after having accounted for the
mechanical offset, one of the following problems may still exist:
• The heading reference that you are comparing the compass is
not accurate.
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