Encyclopedia > D > Dave Ulmer
Dave Ulmer
Dave Ulmer came up with the concept of the GPS Stash Hunt (now called geocaching) and introduced it to the world on May 2, 2000, the day after President Clinton turned off Selective Availability (SA), the intentional degradation of the Global Positioning System (GPS) signals available to the public.
Information are taken from Wikipedia, the open encyclopedia, to which contribute many volunteers from around the whole world. Texts are available under the following conditions GNU Free Documentation License.
Encyklopedie (cz) Encyklopédia (sk) Enzyklopädie (de)