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On May 2, 2000, at approximately midnight, eastern savings time, the great blue switch* controlling selective availability was pressed. Twenty-four satellites around the globe processed their new orders, and instantly the accuracy of GPS technology improved tenfold. Tens of thousands of GPS receivers around the world had an instant upgrade.
For GPS enthusiasts, this was definitely a cause for celebration. Internet newsgroups suddenly teemed with ideas about how the technology could be used.
On May 3, one such enthusiast, Dave Ulmer, a computer consultant, wanted to test the accuracy by hiding a navigational target in the woods. He called the idea the "Great American GPS Stash Hunt" and posted it in an internet GPS users' group. The idea was simple: Hide a container out in the woods and note the coordinates with a GPS unit.
And, thus our hobby was born. For the full story, visit The History of Geocaching at Geocaching dot com.