One in the constellation of 24 GPS satellites that transmits radio signals to Earth from 11,000 miles in space.
Revised
December 12, 2006
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/breakthroughs/global_positioning_sys/gps_satellite_650.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/breakthroughs/global_positioning_sys/gps_satellite_650.html