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S2 7.9 Bear Lake, UT
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Do you have a GPS?

The amount of sideslip will vary with the wind strength and probably get worse when trying to point.

If you have a GPS you might try a similar experiment under different wind conditions: Sail a known heading using the boats compass and seeing the course you are actually sailing on the GPS. Raise and lower the keel to see how it affects the course made good. The GPS experiment will give you an idea of the varying slip in the differing winds.

I think you are probably near the Agonic line (0 magnetic declination) but make sure the GPS is set to magnetic north anyways to not get a false sense of drift.
 
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