Chapter 4: Commissioning the Autopilot 8-4-13
ST290 Instrument System Owner’s Handbook
Setting compass alignment
To carry out compass alignment, enter Seatrial Calibration, then:
1. Use the button to scroll to the ALIGN HEADING page
.
• If you have GPS system installed, keep a steady course and to a
speed above 3 knots for 30 seconds to allow the COG and SOG
values to stabilize, then at the Graphic Display, press the but-
ton for 1 second to set the COG value as the heading value.
Heading alignment tips
You can check the compass alignment after completing the deviation
correction procedure (swinging the compass). After completing the
initial compass calibration, you can make further adjustments to the
alignment without swinging the compass again.
Although the compass calibration removes most of the alignment error,
small errors, of the order of a few degrees, may remain. These will vary
depending on the heading.
Check the heading reading against a number of known headings, plot a
deviationcurve, anddeterminethe headingalignment valuethat willgive
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 more slowly and
in more favorable conditions.
2. Either:
• Steer your boat on a steady course
at a speed that enables you to hold
that course, then use the or
button to manually set the correct
heading value,
or
D6039-1
81183_2 S8.book Page 13 Tuesday, May 6, 2003 9:08 AM
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