I spent much of my evening today scanning in the 1940 Second War Revision map of the Isle of Man. Now that it's all scanned I took the opportunity to have a closer look around some of the places I'm familiar with back on the Island, as well as some things from the past which I'm not so familiar with.
Much has stayed the same on the Island since this map was made at the start of the Second World War, though there have also been some big changes. Towns have grown in size, bypasses have been built to take increasing traffic out of old centres, train lines that used to run from Douglas through St Johns to Peel and Ramsey have been dismantled, and the airport extended from its wartime status as an aerodrome into something a little bigger.
Before I started looking into the grid system used on this map this evening, I hadn't realised that the maps produced during the war weren't yet using the British National Grid for referencing, and instead were using a military grid that also consisted of 1km grid squares - just not the same ones as the National Grid.