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post #2 of (permalink) Old 12-18-2007, 07:16 PM
sandy
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Join Date: May 2002
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Posts: 2,831
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Ground onto map add = GOMA. Map onto ground subtract = MOGS.

It's also pretty easy to work out by looking at the diagram on the bottom of the map and remembering that you are basically measuring an angle.

Or buy a compass with adjustable declination and forget about the whole thing.
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