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Geocaching
Use a GPS to find a treasure.
Geocaching is an outdoor activity that most often involves the use of a Global Positioning System ("GPS") receiver or traditional navigational techniques to find a "geocache" (or "cache") placed anywhere in the world. A typical cache is a small, waterproof container containing a logbook and "treasure", usually trinkets of little value.
The first step in searching for a cache is finding the GPS coordinates of it. To find these, most players (geocachers) look online. A common popular site for this is http://www.geocaching.com/. Next, the geocacher finds his or her way to the coordinates. This may mean walking, biking, hiking, or participating in another outdoor activity. Once a geocacher reaches the coordinates, he or she must find the cache.
A cache, at bear minimum, must be a waterproof container which contains a logbook (a small log allowing geocachers to log their visit to the cache). However, many hiders of caches include other items, such as prises, a camera (for finders to take a picture of themself), or cooridnates to another cache.
Finding a cache is often not as simple as it sounds. GPS coordinates may be off by up to twenty feet, and many caches are very small. In order to compensate for this, most caches have clues in their descriptions (i.e. the site on which you found the coordinates). Such clues may be as obvious as 'under a rock' or may be very criptic, forcing a player to make several conclusions about the location of the cache.
Once a geocacher finds a cache, he adds his name to the logbook. Also, if there is a prise located inside the cache, the player may take it; however, if a geocacher takes a prise, he must put something else back in return.
Source: Wikipedia
Flags: Short (1-3 hours), Medium (3-6 hours), Long (6-24 hours), Solo, With a Friend, With a Group, Teens, Adults, Outdoors, Day, Sunny