how does gps wass work

The WAAS system is made up of about 25 ground stations across the United States, that act as reference points to monitor the GPS satellite data. Of these 25 stations two stations, located on the East and West coasts respectively, gather data from the other stations and create the correction message. The correction takes into account the clock and orbit errors as well as delays caused by atmospheric disturbances. The corrected message then goes to a geostationary satellite (geostationary satellites are satellites with a fixed position over the equator) which then relays it to GPS receivers. These signals can be read by all WAAS enabled GPS receiver.

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