Wide Area Augmentation System (WAAS) 2
Wide Area Augmentation System (WAAS) 2 : US and (Canada) The augmentation to global positioning system (GPS) to meet en route and terminal navigation, non-precision approach and precision approach CAT I accuracy, integrity, continuity and availability requirements. The ground system comprises a sparse network of ground reference stations and a master station linked by terrestrial communications. In the space system, an uplink from the master station provides information to geostationary satellites that transmit an integrity message, corrections and a GPS ranging signal to user avionics. See also: Local Area Augmentation System (LAAS)
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