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The Global Positioning System The Path From Research to Human Benefit (1996) / Chapter Skim
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GPS and the Future
Pages 7-8

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From page 7...
... Air Force, which monitors them from five ground stations around the world. The data gathered are analyzed at the Air Force Consolidated Space Operations Center in Colorado, which transmits daily updates to each satellite, correcting their clocks and their orbital data.
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From page 8...
... ability to introduce errors at any time into the civilian signal to reduce its accuracy to about 300 feet. In March 1996, the White House announced that the highest level of GPS accuracy will be made available to everyone, and the practice of degrading civil GPS signals will be phased out within a decade.
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