http://en.wikipedia.org/wiki/Global_Positioning_Systemhttp://electronics.howstuffworks.com/gadgets/travel/gps.htm
http://www8.garmin.com/aboutGPS/
http://www.pocketgpsworld.com/howgpsworks.php
http://mashable.com/2012/11/16/gps/
http://www.gps.gov/multimedia/poster/
http://www.kowoma.de/en/gps/orbits.htm
Videos
http://electronics.howstuffworks.com/38-how-gps-works-video.htm
Of Interest
http://www.bbc.co.uk/news/magazine-23473169
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