lescaster Posted July 9, 2004 Share Posted July 9, 2004 I'm reading a book by Michael Ferguson named "GPS Land Navigation" and I'm enjoying it but he mentions this Selective Availability business and I get the impression that this has been turned off, or is going to be sometime. Does anybody know? Quote Link to comment
+The Jester Posted July 9, 2004 Share Posted July 9, 2004 SA was turned off on May 1, 2000. That's what made this sport happen. Prior to that the accuracy was plus/minus 100 meters. Three days later the first cache was placed, and (after a little while, with different names tossed around) the sport of Geocaching was born. SA can be turned on at any time, so that enemies can't use the signals. Either the entire system or in local areas. Quote Link to comment
+writer Posted July 9, 2004 Share Posted July 9, 2004 In fact, it was the turning off of SA by an executive order by Clinton that made geocaching possible. In May of 2000, when suddenly consumer GPS receivers could get 15 meter accuracy, the members of a GPS Internet newsgroup were wondering how they could take advantage of it and Dave Ulmer offered to hide a container of stuff for someone to find, based on the GPS coordinates. And that's when geocaching (it took a bit for them to come up with the name) started. Quote Link to comment
gm100guy Posted July 9, 2004 Share Posted July 9, 2004 try this link for good information Quote Link to comment
+Subterranean Posted July 10, 2004 Share Posted July 10, 2004 ...and if you're interested, here's a collection of links that trace the history of geocaching. The first link covers the presidential press release from May 1, 2000 regarding SA. Good stuff. Quote Link to comment
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