http://www.robertplank.com Geocaching is a hobby that uses the GPS, or global positioning system. As of August 2008 over 640,000 caches have been hidden in every continent including Antarctica. The way geocaching works is, you go online or use your phone to type in an address or set of GPS coordinates and this service provides you with a list of hidden treasures located nearby. These caches have been hidden by other geocachers and contain a log book where you can sign your name.
