Geocaching is a real-world, outdoor treasure hunting game using GPS-enabled devices. Participants navigate to a specific set of GPS coordinates and then attempt to find the geocache (container) hidden at that location.
This is the original geocache type consisting of, at minimum, a container and a log book or logsheet. Larger containers generally include items for trade. “Nano” or “micro” caches are tiny containers that only hold a logsheet. The coordinates listed on the traditional cache page provide the geocache’s exact location.
A Multi-Cache ("multiple") involves two or more locations. The final location is a physical container. There are many variations, but most Multi-Caches have a hint to find the second cache, and the second cache has a hint to the third, and so on. An offset cache (where you go to a location and get hints to the actual cache) is considered a Multi-Cache.
The "catch-all" of cache types, this form of geocache may involve complicated puzzles that you will first need to solve to determine the coordinates. Mystery/Puzzle Caches often become the staging ground for new and unique geocaches that do not fit in another category.
An Event Cache is a gathering of local geocachers or geocaching organizations to discuss geocaching. The Event Cache page specifies a time for the event and provides coordinates to its location. After the event, the cache is archived.
Cache In Trash Out is an activity intimately tied to geocaching. While searching for caches, geocachers collect litter along the trails and properly dispose of it. Cache In Trash Out Events are larger gatherings of geocachers that focus on litter clean-up, removal of invasive species, revegetation efforts or trail building.
An EarthCache is a special place that people can visit to learn about a unique geoscience feature of our Earth. EarthCache pages include a set of educational notes along with cache coordinates. Visitors to EarthCaches can see how our planet has been shaped by geological processes, how we manage its resources and how scientists gather evidence to learn about the Earth. For more information about EarthCaches, visit http://www.earthcache.org/.