Rich Keller
Contributor
Another thing you might try is looking at your compass. Get the compass face level and use that as a reference.
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If this occurred during an ascent, it may be alternobaric vertigo. This is where the two ears equalize at different rates, creating a pressure differential that causes different signals regarding orientation to come from the two different ears. Since there is no way to force equalization on ascent, the only thing you can do is cope with the results.