GPS

ALSO CALLED: Global Positioning Systems
DEFINITION: The GPS (Global Positioning System) is a "constellation" of 24 well-spaced satellites that orbit the Earth and make it possible for people with ground receivers to pinpoint their geographic location. The location accuracy is anywhere from 100 to 10 meters for most equipment. Accuracy can be pinpointed to within one (1) meter with special military-approved equipment. GPS equipment is widely used  … 
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GPS DEFINITION (continued): …  in science and has now become sufficiently low-cost so that almost anyone can own a GPS receiver.The GPS is owned and operated by the U.S. Department of Defense but is available for general use around the world. Briefly, here's how it works:21 GPS satellites and three spare satellites are in orbit at 10,600 miles above the Earth. The satellites are spaced so that from any point on Earth, four satellites will be above the horizon.Each satellite contains a computer, an atomic clock, and a radio. With an understanding of its own orbit and the clock, it continually broadcasts its changing position … 
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