Join Date: Mar 2002
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Well, obviously, they do it for people who want to use the compass while the the unit is vertical, but they know that it''s not going to be as accurate as your boat''s compass, and at least they say that plainly in their documentation.
I think that the compass itself is just a feature added to make it look better on paper. They even recommend turning it off to help conserve battery life.
Next time you see such a variance, just lay the unit down and you should see it assume a more correct reading.