Sorry Bekkr I thought I had answered you questing on you last post.
It's because there is no way we have to calibrate the image (the compass wheel) to be exact when we mod it. I also doubt that the image will ever be spot on with the actual heading data, because of the digital to analog conversion code. And no it isn't centered on N, S, E or W. If I recall it starting position is some where in between on of the 4 or it use to be.
Any way that's why I believe the two are never in sync.
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