Indeed Welcome to the forum Johnny, good to have an 'Old hand' in navigation on hand:) I was thinking the other day if we run the risk of loosing some of the old school navigational techniques. what brought it to mind was a publication by one of my good friends, Alfie Ingram, former Chair of the Mountain Rescue Committee of Scotland and Tayside MRT Team Leader, climbing publication from back in the 1960's.
Do you have any of your old reference books still?