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WAAS

(Wide Area Augmentation System) A system of earth stations and satellites that improves the tracking accuracy of the GPS navigation system to approximately 10 feet. Deployed in 2003, WAAS comprises a group of 25 reference stations and two satellites that cover North America. The stations track the GPS satellites and send correction signals to the WAAS satellites, which transmit them to WAAS-enabled receivers. See GPS augmentation system and GPS.



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