grid to mag=addmag to grid =get ridgrid bearing to magnetic you add declinationmagnetic bearing to grid bearing you take it away!!
Quote from: sniperkona on November 23, 2011, 08:35:50 PMgrid to mag=addmag to grid =get ridgrid bearing to magnetic you add declinationmagnetic bearing to grid bearing you take it away!!But only where magnetic north is west of grid north. If GMA is east of grid north it becomes:Grid to mag- get ridmag to grid-addok then smart arse will there ever be a time when it does that in the northern hemi?I'm sure I have a map at home which straddles the dividing line, on one side of the sheet the GMA is west, on the other it is east. Makes resections interesting.