Geocaching is a high-tech treasure hunting game played throughout the world by adventure seekers equipped with GPS devices. The basic idea is to locate hidden containers, called geocaches, outdoors and then share your experiences online.
Waymarking.com provides tools for you to catalog, mark and visit interesting and useful locations around the world.
Wherigo is a toolset for creating and playing GPS-enabled games in the real world. Players use GPS technology to guide them to physical locations where they interact with virtual objects and characters.
Cache In Trash Out is a worldwide environmental cleanup effort supported by the geocaching community. Since 2002, geocachers have been dedicated to cleaning up parks and other cache-friendly places around the world. Through these volunteer efforts, we help preserve the natural beauty of our outdoor resources!