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Global Positioning System Primer
Information about the global positioning system (GPS), an aerospace technology that uses satellites and ground equipment to determine positions anywhere on Earth and used today by the military and in navigation and mapping. Includes a brief history of navigation, a GPS timeline, and links to related sites. From the Aerospace Corporation, "a federally funded research and development center in support of national security, civil and commercial space programs."
http://www.aero.org/education/primers/gps/
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