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Magvar or GMA?
Submitted by Mike Beckett on 19/Sep/2013
The page <="://googlecompass.com/MagneticVariation.htm" target="_blank" rel="nofollow">://googlecompass.com/MagneticVariation.htm is headed Magnetic Variation, but then goes on to discuss Grid Magnetic Angle (GMA)
It is vital to distinguish between the two, as the two figures will normally be different.
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