Top stuff, thats a great idea (personally I prefer the old map and compass but like you say, it would teach you how to use it).
Does anyone remember the map and compass challenge on Dartmoor (I think). You basically had the same idea as mentioned above. A gold coin or similar was placed in an ammo box and buried on Dartmoor, you got a map from a local shop and then had to follow point to point to locate the said box. The challenge was very diffiuclt as there were no features to relate to, you had to pace everything out abd be very exact. I can never recall anyone finding it when I was based down that way.
What you call hell, he calls home.
Col. Samuel Trautman