I use the Silva Type 15TD-CL Sighting compass, graduated in mils, with adjustable declination. You crank in the current magnetic variation, using the brass key on the lanyard and then ...:
NO MORE MGA - mag to grid add OR GMS - grid to mag subtract!
N.B. You will have to specify ... Sighting compass with mils and adjustable declination. Yes it costs more BUT it is a great deal easier to use, especially at the end of a day.
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