*sigh*. You know... I'm studying to be a pilot, I've done mapping courses in the RFS, and I had completely forgotton about magnetic variation.
I'd imagine that would be a lot of the problem. Benno I know what you mean, but I do happen to have a magnetic inclinometer so I'll go with that
Drift alignment you say? Hmm... not sure what that is, but 10 minutes reading on google should get me moving in the right direction. Thanks for suggestions so far!
Anthony