The Global Positioning System (GPS) Primer, created by the Aerospace Corporation, gives basic information on how a GPS works and the many ways in which it is used. Supplying straight-forward text with a few graphics and illustrations, sections range from "What is Navigation?" to "Military Uses for GPS." Includes a search option and an organized selection of links to other GPS related sites. The GPS Primer is also downloadable (.pdf, 1618 KB).
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