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. Participants are called geocachers; those not familiar with geocaching are called geo-muggles or just muggles, a term borrowed from the Harry Potter series.
Geocaching is similar to a much older activity called letterboxing. The major difference is its use of the GPS and the Internet.
There are a number of Web sites that list geocache sites around the world. The best known is geocaching.com, which dates from 2000 and whose owners have attempted to commercialize the sport, including attempts to trademark the word "geocache". These attempts have often proved controversial in the community.
In the United States, where most geocaching services are hosted, co-ordinates are not protected by copyright but cache data is. Commercial web-sites listing geocache data are generally protective of their data.
People using publicly available data taken from geocaching.com have been threatened with lawsuits by Groundspeak, Inc., the owners of geocaching.com. One of the most notable examples of this is that of Ed Hall who in 2001 was threatened with a lawsuit if he didn't place a notice stating that all geocaching data used in the creation of his geocache maps was copyrighted by Groundspeak, Inc. The legal advice received by Hall suggested that such a notice was unnecessary but his site now acknowledges the various sources of cache data
i donot have any.