10-01-2013, 01:20 PM
Would anyone know how to calculate Magnetic Declination back through the years ie: I have an old hand drawn plan whos only ref. is magnetic North.
Lawrence.
Lawrence.
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Magnetic Declination
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Magnetic Declination - by pwdrive - 10-01-2013, 01:20 PM
RE: Magnetic Declination - by Mark R - 10-01-2013, 01:29 PM
RE: Magnetic Declination - by pwdrive - 10-01-2013, 01:31 PM
RE: Magnetic Declination - by Mark R - 10-01-2013, 02:02 PM
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