GPS

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…if we continue to increase our reliance on such technologies it may have an undesired result. The less we rely on ourselves and the more we look to someone or something else to inform us and instruct us, the more incompetent and less self-reliant we become. http://www.trimble.com/gps/howgps/gpsfram1.htm http://gpshome.ssc.nasa.gov/ http://www.gpsworld.com/0699/0699innov.html http://www.g3oceanography.com/ http://pubs.usgs.gov/.html