Wide Area Augmentation Service (WAAS) uses a network of ground stations to monitor the GPS position accuracy. The error corrections are sent to two master stations, which in turn send error correction information to the constellation of satellites. The continuously varying error correction information is broadcast by the satellites and is then available to all WAAS compatible GPS receivers. The 95% error is then reduced to 7.5 metres. Manufacturers usually optimistically claim a 3-metre accuracy. Integrity monitoring is part of this system, so anomalous
signals from under-performing satellites are automatically discarded.
WAAS is available only in the United States of America, but European Geostationary Navigation Overlay Service (EGNOS) and the Japanese Multi-Functional Satellite Augmentation System (MSAS) provide the same service in areas covered by these. A WAAS compatible receiver will operate with EGNOS and MSAS.
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