I don't see any problem, so I voted yes.

Actually, I'm not sure if you were here by this time, anomiecoalition, but we had something close to your idea in the Lite Challenge, where the participants had to make a compass rose.

If not a new type of challenge, maybe it could be used on shorter periods of time - like february, or when a CL forget to start a new challenge and 6 days are gone - since it is faster than a map to do, considering a common object of course.