Geocaching

thumb|upright|A geocache concealed behind a sign in the Erratic Rock State Natural Site state park 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, at specific locations marked by coordinates all over the world. The first geocache was placed in 2000, and by 2023 there were over three million active caches worldwide.

thumb|A 2004 USA Geocoin

outdoor hobby

dog tag used in geocaching

thumb|A GeoKret GeoKrety (from Greek: geo, "earth" and Polish: krety, "moles") is an online tracking service targeted at Geocachers. Each registered object, called a GeoKret (plural: GeoKrety), has a unique tracking code, allowing its movements between locations such as Geocaches to be tracked and registered on the service. While the idea behind trackable items such as GeoKrety originated with the geocoin and travel bug, Geokrety is an independent trackable service that can be used with any geocaching activity.