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GPS accuracy to get a check-up

JAN. 7 -- The National Oceanic and Atmospheric Association announced this week it would lead an international effort to pinpoint the locations of more than 40 global positioning satellites in Earth orbit in an effort to ensure the accuracy of GPS data vital to safe navigation.

NOAA personnel will compile and analyze satellite orbit data from 10 analysis centers worldwide to ensure the accuracy of GPS information. For the next four years NOAA’s National Geodetic Survey ( will serve as the Analysis Center Coordinator for the International Global Navigation Satellite Systems Service, a voluntary federation of more than 200 organizations that provide continuous global satellite-tracking data.

The Global Navigation Satellite Systems, which include the U.S.-based Global Positioning System, the Russian GLONASS system, and the upcoming European Galileo system, are used for accurately determining the geographic position of any point on Earth.