I had dinner with some one who enjoys geocaching. Geocaching “gee-oh-cash-ing” is a new form of recreation facilitated by inexpensive Global Positioning System components. As stated on the geocaching web site,

The basic idea is to have individuals and organizations set up caches all over the world and share the locations of these caches on the internet. GPS users can then use the location coordinates to find the caches. Once found, a cache may provide the visitor with a wide variety of rewards. All the visitor is asked to do is if they get something they should try to leave something for the cache.