How about this for a new take on Geocaching
http://hackaday.com/2009/10/19/reverse-geocache-puzzle/
The cache won't open till you are in the correct location
How about this for a new take on Geocaching
http://hackaday.com/2009/10/19/reverse-geocache-puzzle/
The cache won't open till you are in the correct location
might be a bit of a pain having to post one of these to every cacher in the country LOL
Could make a great basis for a puzzle cache....