The Global Positioning System, usually called GPS, is the only fully-functional satellite navigation system. A constellation of more than two dozen GPS satellites broadcasts precise timing signals by radio to GPS receivers, allowing them to accurately determine their location (longitude, latitude, and altitude) in any weather, day or night, anywhere on Earth.

GPS has become a vital global utility, indispensable for modern navigation on land, sea, and air around the world, as well as an important tool for map-making, and land surveying. GPS also provides an extremely precise time reference, required for telecommunications and some scientific research, including the study of earthquakes.

United States Department of Defense developed the system, officially named NAVSTAR GPS (Navigation Signal Timing and Ranging GPS), and the satellite constellation is managed by the 50th Space Wing at Schriever Air Force Base. Although the cost of maintaining the system is approximately US$400 million per year, including the replacement of aging satellites, GPS is available for free use in civilian applications as a public good.

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Car GPS: Portable Global Positioning Systems GPS System Reviews http://bit.ly/5wQVcM
emforesta (Emmetta Forestel) Wed, 16 Dec 2009 08:27:30 -0000
Car GPS: Portable Global Positioning Systems GPS System Reviews http://bit.ly/5wQVcM
http://gmed.net/M: Innovative Medical Alert System Uses GPS and Cellular Technology : A new cellular and global positioning ...
Hospimedica (HospiMedica.com) Tue, 15 Dec 2009 15:21:02 -0000
http://gmed.net/M: Innovative Medical Alert System Uses GPS and Cellular Technology : A new cellular and global positioning ...
Global Positioning Systems are now being used in sport and fitness training, see how http://tinyurl.com/y88gy97
SIRCtweets (SIRC) Tue, 15 Dec 2009 15:03:28 -0000
Global Positioning Systems are now being used in sport and fitness training, see how http://tinyurl.com/y88gy97
Ben Margot/The Associated Press: (Taking time to have the global positioning device implanted under my skin.) A.. http://bit.ly/5heaHq
beautyO7 (Beauty O.) Tue, 15 Dec 2009 13:02:47 -0000
Ben Margot/The Associated Press: (Taking time to have the global positioning device implanted under my skin.) A.. http://bit.ly/5heaHq
James Douglas and Bjorn Ekestaf: positioning to continue improving a unique combo of global reach with local expertise http://is.gd/5odBV
rudolfed (Rudolf Fedorovici) Tue, 15 Dec 2009 08:41:06 -0000
James Douglas and Bjorn Ekestaf: positioning to continue improving a unique combo of global reach with local expertise http://is.gd/5odBV
Global Positioning System (GPS) Receivers Price:US$71.95 Check it out: http://bit.ly/4S7e76 #tweetshop
freecommunity (FCC) Tue, 15 Dec 2009 00:30:38 -0000
Global Positioning System (GPS) Receivers Price:US$71.95 Check it out: http://bit.ly/4S7e76 #tweetshop

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