Geocaching is a hightech sport centered around the use of handheld GPS navigation device. The goal is to locate a cache by it's GPS coordinates posted on the Internet by those hiding the cache. The caches are containers that vary in size and contents. They may be as small as a film canister with a log in it, or as large as an ammo box. A cache may provide the visitor with a wide variety of rewards and the "geocashers" exchange items left in the cache with items of their own. Finding a cache can be easy or difficult.