"Geocaching /\u02C8d\u0292i\u02D0o\u028A\u02CCk\u00E6\u0283\u026A\u014B/ 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."@en . . "Caching, Treasure Hunting"@en . . . "Geocaching"@en .