84 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
6 Setting-up the ST4000+
8. Use -1 and +1 or -10 and +10 to adjust the displayed heading until
it matches boat’s steering compass or a known transit bearing.
9. Press and hold standby for 2 seconds to exit calibration and save
the new settings.
Note: Setup options are always saved on exit.
Adjusting the heading alignment
You should always check the compass alignment after completing the
deviation correction procedure (swinging the compass). After you
have completed the initial deviation correction procedure, you can
make adjustments to the alignment as often as you wish without
swinging the compass again.
Although the compass deviation correction procedure removes most
of the alignment error, small errors (of the order of a few degrees) will
probably remain, that vary depending on the heading.
Ideally, you should check the heading reading against a number of
known headings, plot a deviation curve, and determine the heading
alignment value that will give the lowest average alignment error.
You can then enter this value on the Heading Alignment screen, as
described above.
If the average heading error is more than 5°, you should perform the
compass deviation correction procedure again, circling slower and in
move favorable conditions.
D3459-2
Autopilot heading Steering compass
Known
heading
D3327-2
81131_7.book Page 84 Wednesday, March 17, 2004 3:59 PM
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