GPS Information Sources:

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• Geospatial Virtual Camp http://outreach.cast.uark.edu:8080/uofalogin/

• NOAA - National Geodetic Survey http://www.ngs.noaa.gov/

• US Coast Guard  http://www.navcen.uscg.gov/

• How Stuff Works: GPS http://electronics.howstuffworks.com/gps.htm

• Wikipedia GPS  http://en.wikipedia.org/wiki/Global_Positioning_System

• GPSWorld Magazine  http://www.gpsworld.com/gpsworld/

• Trimble's GPS Tutorial  http://www.trimble.com/gps/index.shtml