How does GPS work? Feature Summary

From Physics Research
How does GPS work?
The photo shows a Global Positioning System satellite. To find out how the system works, visit How does GPS work?, and be sure to see the video to understand how three or four different GPS satellites specify your position on Earth. For more, check out this Beyond Discovery page from the National Academy of Sciences.
Image credit: Scott Ehardt, Wikimedia Commons; <a href="" target="_blank">image source</a>; <a href="" target="_blank">larger image</a>
Image credit: Scott Ehardt, Wikimedia Commons; image source; larger image
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September 1, 2011 - September 30, 2011