In this article, we'll find out how these handy guides pull off this amazing trick. As we'll see, the Global Positioning System (GPS) is vast, expensive and involves a lot of technical ingenuity, but the fundamental concepts at work are quite simple and intuitive. Read more...
http://electronics.howstuffworks.com...travel/gps.htm
http://electronics.howstuffworks.com...travel/gps.htm
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