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Satellite navigation is how sailors now find their way around - and everyone else too! The Global Positioning System (GPS) home page is at http://www.gps.gov/applications/marine/index.html, which will link you to other US Government GPS sites. You can find a webzine at http://www.gpsworld.com/.
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A good introduction to the subject of satellite navigation is at www.colorado.edu/geography/gcraft/notes/gps/gps_f.html |
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You can find technical discussions of satelltie navigation theory at www.gmat.unsw.edu.au/snap/snap.htm |