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Geocaching is an outdoor recreational activity, in which participants use a Global Positioning System (GPS) receiver or mobile device and other navigational techniques to hide and seek containers, called "geocaches" or "caches", anywhere in the world. A typical cache is a small waterproof container containing a logbook (with a pen or pencil). The geocacher enters the date they found it and signs it with their established code name. After signing the log, the cache must be placed back exactly where the person found it. Larger containers such as plastic storage containers (Tupperware or similar) or ammunition boxes can also contain items for trading, such as toys or trinkets, usually of more sentimental worth than financial. Geocaching shares many aspects with benchmarking, trigpointing, orienteering, treasure-hunting, letterboxing, and waymarking. ==History== Geocaching was originally similar to the 160-year-old game letterboxing, which uses clues and references to landmarks embedded in stories. Geocaching was conceived shortly after the removal of Selective Availability from the Global Positioning System on May 2, 2000, because the improved accuracy of the system allowed for a small container to be specifically placed and located. The first documented placement of a GPS-located cache took place on May 3, 2000, by Dave Ulmer of Beavercreek, Oregon. The location was posted on the Usenet newsgroup sci.geo.satellite-nav〔(sci.geo.satellite-nav )〕 as . By May 6, 2000, it had been found twice and logged once (by Mike Teague of Vancouver, Washington). According to Dave Ulmer's message, this cache was a black plastic bucket that was partially buried and contained software, videos, books, food, money, and a slingshot.〔 A geocache and plaque called the Original Stash Tribute Plaque now sit at the site. The activity was originally referred to as ''GPS stash hunt'' or ''gpsstashing.'' This was changed shortly after the original hide when it was suggested in the gpsstash eGroup that "stash" could have negative connotations and the term ''geocaching'' was adopted. Over time, a variety of different hide-and-seek-type activities have been created or abandoned, so that "geocaching" now may refer to hiding and seeking containers, or locations or information without containers.〔(【引用サイトリンク】title=Geocache types )〕 An independent accounting of the early history documents several controversial actions taken by Irish and Grounded, Inc., a predecessor to Groundspeak, to increase "commercialization and monopolistic control over the hobby".〔(The History of Geocaching ), retrieved January 12, 2013〕 More recently, other similar hobbies such as Munzee have attracted some geocachers by rapidly adopting smart-phone technology, which has caused "some resistance from geocaching organizers about placing caches along with munzees". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geocaching」の詳細全文を読む スポンサード リンク
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