We had a saying to help remind recruits how to work out the magnetic variation between true (grid) north and magnetic north and vice versa.
They were told to look at the date of printing at the top of the map, its magnetic variation at the time of printing and the annual variation, then calculate the amount of magnetic variation. They were told:-
To covert “Mag to grid, get rid (of the variation)” and “Grid to mag, add (the variation)”
Adversus solem ne loquitor
Last edited by BritinAfrica; November 8th, 2011 at 06:21..