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Old 08-10-2010
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I'd point out that some GPS units, especially the multifunction display type units, may be showing a magnetic heading based on a FLUXGATE compass, rather than on GPS-calculated movement over ground, as Jerry describes.

It would help if the OP said exactly what electronics he has aboard. The C60 is a relatively vague description, since the C60 can have both a fluxgate compass and a GPS antenna attached to it.
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