With this tool and sextant in hands you could register all your "location" pictures in a one big picture (maybe resources either, and exits to the nearby locations) And the map you draw could be as a key - to copy it you should need some quite valuable resources (let's say - some wood (or maybe paper...)) so that it could not be wide spread across the whole CANTR world, and it could only be updated by having these two tools (drawing board and sextant) in hands.
Thats all my thoughts..
Awaiting for critics
