Onwa Marine Electronics KAP-833 - Manual (Page 19)

The compass supplied with your KAP-833 autopilot has been calibrated during
manufacture. This calibration will be satisfactory for almost all installations. If
you have a steel vessel, or some other factor which causes the compass to perform
poorly, the calibration procedure will adjust compass characteristics to compensate.
The calibration should only be done if the compass is known to be inaccurate.
If the KAP-833 compass display as constant offset (eg the autopilot compass
reads 3 degrees high on all bearings), simply rotate the KAP-833 compass case
to align bearings with the ships compass.. it is not necessary to re-calibrate the
compass as described below.
If the KAP-833 compass has inconsistent variation on different headings, the
following calibration procedure can be carried out. This procedure should only be
done in calm waters with adequate sea room.
1. Enter 901 by using keypad, then hold down GOTO, Press AUTO,
then release both buttons together.
2. Turn vessel slowly through two complete circles in same direction. Each
complete turn should take at least 60 seconds.
3. When the circles are complete, enter 902 by using the keypad, then
hold down GOTO, press AUTO then release both buttons together.
This completes the compass calibration. Check alignment of the KAP-833
compass by steering vessel due North (000 on ships compass) and, if necessary,
rotate outer case of the KAP-833 compass in its bracket until the heading display
reads 000.
Note: The effectiveness of the calibration is dependent upon all 3 steps being
completed. Should you wish to abort the calibration procedure at any time
during the circle turning, do not carry out step 3.
It is important to realise that on any vessel the ships compass can have heading
errors as a result of the vessels magnetic signature. These errors can be minimised
by having the ships compass swung and compensated by a licensed compass
adjuster. In any case it is highly unlikely that the ships compass and autopilot
compass will be congruent for every heading.
If you are unsure of the success of the calibration, you may return to the factory
calibration setting by entering
903 , hold down GOTO, press AUTO, then
release both buttons together.
Compass Calibration Compass Calibration
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