Magvar or GMA?

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Magvar or GMA?

Delete this post Submitted by Mike Beckett on 19/Sep/2013

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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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