Geocaching is an outdoor activity that is similar to a treasure hunt. The goal of the activity is to find hidden containers known as caches or geocaches using a portable satellite navigation device called a Global Positioning System (GPS) receiver. Individuals who practice this activity (generally referred to as cachers or geocachers) place a cache in an outdoor location and post the cache’s latitudinal and longitudinal coordinates on the Internet. Other geocachers then use their GPS devices to download the coordinates and cache descriptions from the Internet in order to find the caches. Once the participant has found the cache, they may log their findings on the Internet.
There are a number of different types of caches. Physical caches include a logbook, pencil, and trade items (small objects left in the caches for geocachers to trade with one another – e.g. toys, key chains, etc.). Another type of cache is an earth cache, which highlights an area’s unique natural features.