The WAAS infrastructure consists of 38 ground reference stations spread throughout the United States, two master stations that provide control for the other stations, two geosynchronous satellites, four uplink stations, two operational control centers and the WAAS terrestrial communications network. The ground stations operate from precisely measured locations and send data that adjusts the normal GPS accuracy to the higher level of accuracy that WAAS receivers require. Additionally, the aircraft's WAAS computer typically operates at a much higher speed than previous GPS devices, thus ensuring continuous and accurate monitoring.
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