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post #3 of Old 08-10-2010
jerryrlitton
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Quote:
Originally Posted by montenido View Post
Hi all,

I know this is a beginner question, but here goes. On my new (to me) boat, the compass and GPS show fairly different headings. I have a Raymarine C-60 and a Richie compass. I would assume that the GPS is the correct heading and that the compass needs calibration, but how do I know for sure?

Thanks, Bill
Ok 1st thing, your GPS is not showing a heading. It is showing a traffic across the ground usually in magnetic but that will depend on how you have yours configured. Of course your track will vary with current, winds and your leeway. Also your compass needs to be calibrated for your installation area (deviation) and it is also subject to magnetic variation. So it is no small wonder there is a difference between the 2.

Jerry

Part time PADI instructor, part time sailor. Full time having a blast.


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