MPN11 (your #104),
...the standard chinagraph pencil represented about 5 minutes flying time ... et voila!..
Recalls my method of navigation round the Indian subcontinent 70+ years ago - only I used the end of my thumb-joint (represented 8 miles run on the map in use). Never failed ! (and you couldn't leave it behind).
...Images HERE at LWD24 and LWD25 ... and lots for me to read, having discovered that website!! ...
Looked the pics, thought: "
there but for the grace of God......."
Danny.