GPS -- http://www.epinions.com/otdr-electronics-gps_systems
Reviews on GPS written by consumers at Epinions.com.
How Stuff Works: Global Positioning System Receivers -- http://www.howstuffworks.com/gps.htm
Explanation of Global Positioning System (GPS) receivers.
An Introduction to the GPS Revolution -- http://gorp.away.com/gorp/activity/hiking/skills/navigation/lat_lon.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.
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