Geohashing
![The sign forbids a geohasher to trespass and reach the location set by the algorithm. His expedition has to end there.](/Images/godic/202501/15/Geohash_2014-01-13_Location1551.jpg")
Geohashing /ˈdʒiːoʊˌhæʃɪŋ/ is an outdoor recreational activity inspired by the xkcd webcomic, in which participants have to reach a random location (chosen by a computer algorithm), prove their achievement by taking a picture of a Global Positioning System (GPS) receiver or another mobile device and then tell the story of their trip online. Proof based on non-electronic navigation is also acceptable.