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Old 17-08-2010, 23:28   #1
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Join Date: Aug 2010
Location: Queensland Australia
Boat: Roscoe 14
Posts: 2
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DIY Compass Adjustments

There are several reasons why the compasses indicate different headings.
  • They are not both aligned to the vesselís longitudinal axis.
  • They are experiencing different magnetic fields caused by the boat
  • They are experiencing different magnetic fields caused by the pier.
  • One or both are mechanically defective with the directive magnets and the card misaligned
  • A combination of the above.
The check is when underway away from the pier. If the difference is constant on all headings, the issue is either 1 or 4. If the difference in heading reading varies with heading, the issue is 2 and may also have an element of 1 & 4. If everything is alright, the issue was 3.

Determining the error in you compass is not difficult. If you need more help contact me.
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