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The system was developed by the US [[Department of Defense]] and made available to the general public in 1983 under orders of [[Ronald Reagan|President Reagan]]. GPS for civilian use used to include a mechanism called Selective Availability that intentionally limited the accuracy of GPS, a mechanism originally intended to confuse potential enemies who might launch a missile attack, but Selective Availability was disabled in 2000, and appears unlikely to be reinstated in the foreseeable future.
The system was developed by the US [[Department of Defense]] and made available to the general public in 1983 under orders of [[Ronald Reagan|President Reagan]]. GPS for civilian use used to include a mechanism called Selective Availability that intentionally limited the accuracy of GPS, a mechanism originally intended to confuse potential enemies who might launch a missile attack, but Selective Availability was disabled in 2000, and appears unlikely to be reinstated in the foreseeable future.
Prosecutors are now using data from GPS units to convict criminals. Authorities can analyse data from the GPS units to establish a defendant's whereabouts or to track suspects.<ref>[http://www.foxnews.com/story/0,2933,413041,00.html Small GPS Devices Help Prosecutors Win Convictions], Associated Press, ''Fox News'', August 28, 2008</ref>
Prosecutors are now using data from GPS units to convict criminals. Authorities can analyse data from the GPS units to establish a defendant's whereabouts or to track suspects.<ref>[https://www.foxnews.com/story/0,2933,413041,00.html Small GPS Devices Help Prosecutors Win Convictions], Associated Press, ''Fox News'', August 28, 2008</ref>
== History ==
== History ==
* [http://www.navcen.uscg.gov/?pageName=GPS USCG Navigation Center]—Status of the GPS constellation, government policy, and links to other references; includes satellite [[almanac]] data.
* [http://www.navcen.uscg.gov/?pageName=GPS USCG Navigation Center]—Status of the GPS constellation, government policy, and links to other references; includes satellite [[almanac]] data.
* [http://gps.losangeles.af.mil/ The GPS Program Office (GPS Wing)]—Responsible for designing and acquiring the system on behalf of the United States Government.
* [http://gps.losangeles.af.mil/ The GPS Program Office (GPS Wing)]—Responsible for designing and acquiring the system on behalf of the United States Government.
* U.S. Army Corps of Engineers manual: [http://web.archive.org/web/20080822132227/http://www.usace.army.mil/publications/eng-manuals/em1110-1-1003/toc.htm NAVSTAR HTML] and [http://web.archive.org/web/20080625111519/http://www.usace.army.mil/publications/eng-manuals/em1110-1-1003/entire.pdf PDF (22.6 MB, 328 pages)]
* U.S. Army Corps of Engineers manual: [https://web.archive.org/web/20080822132227/http://www.usace.army.mil/publications/eng-manuals/em1110-1-1003/toc.htm NAVSTAR HTML] and [https://web.archive.org/web/20080625111519/http://www.usace.army.mil/publications/eng-manuals/em1110-1-1003/entire.pdf PDF (22.6 MB, 328 pages)]
* [http://www.ngs.noaa.gov/orbits/ National Geodetic Survey] Orbits for the Global Positioning System satellites in the Global Navigation Satellite System
* [http://www.ngs.noaa.gov/orbits/ National Geodetic Survey] Orbits for the Global Positioning System satellites in the Global Navigation Satellite System
* [http://www.relativityscience.com/explaining_relativity_of_time.shtml Relativity Science Calculator: Explaining Global Positioning System ( GPS )]
* [http://www.relativityscience.com/explaining_relativity_of_time.shtml Relativity Science Calculator: Explaining Global Positioning System ( GPS )]