01-22-14, 07:06 AM
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#6
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Kaiser Bill's batman
Join Date: May 2010
Location: AN72
Posts: 13,203
Downloads: 76
Uploads: 0
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British Geographical Survey has a handy little calculator. 
Saves on the maths, and lessens the headache. 
http://www.geomag.bgs.ac.uk/data_ser.../gma_calc.html
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