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post #2 of Old 06-17-2010
Boasun
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There are two things that affect Magnetic compasses normally.
1. variation
2. Deviation

One other minor detail; there could be a magnetized tool, screw or bolt next to it. Or a speaker/mike for a radio next to it. If your Autohelm is using a magnetic compass. Oh! someone might have reversed a compensating magnetic that is being used for correcting that compass. That happens every now and then.

1600 Ton Master, 2nd Mate Unlimited Tonnage

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