Here are listed top sites about Geocaching: What is Geocaching? Geocaching, is an outdoor treasure-hunting game in which participants (called "geocachers") use a Global Positioning System receiver or other navigational techniques to hide and seek containers (called "geocaches" or "caches") anywhere in the world. A typical cache (pronounced /kæʃ/ like the English word cash) is a small waterproof container containing a logbook and "treasure" (usually toys or trinkets of little monetary value). Some variations of the game include a point system to enhance game play.