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Global Positioning
Websites
Reviews on GPS written by consumers at Epinions.com.
http://www.epinions.com/otdr-Electronics-GPS_Systems
Explanation of Global Positioning System (GPS) receivers.
http://www.howstuffworks.com/gps.htm
How to make the most out of a Global Positioning System with your contour map while in the backcountry. Also, basic longitude and latitude skills revisited.
http://gorp.away.com/gorp/activi...ng/skills/navigation/lat_lon.htm