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• Recreation: Outdoors: Geocaching  (100)
• Science: Earth Sciences: Geomatics: Global Positioning System  (44)
• Shopping: Consumer Electronics: Communications: Global Positioning System  (150)

GPS Devices Reviews of GPS receivers written by consumers at Epinions.com. Can be viewed by price range, brand, mapping capability, marine features. http://www.epinions.com/GPS_Devices

GPS Reviews Top-rated GPS handheld portable units, in-car systems, and PDA/computer plugin receivers. Where to find reviews in computer or technology publications and web sites. Links to reviews, with comments and credibility rating. http://www.consumersearch.com/www/electronics/gps/index.html

How Stuff Works: Global Positioning System Receivers Explanation of Global Positioning System (GPS) receivers. http://www.howstuffworks.com/gps.htm