GPS — WAAS
The Wide Area Augmentation System (WAAS) is a special system that supplements the space-based satellite signals of the primary GPS constellation. WAAS improves the accuracy of GPS for specially equipped aircraft to a few feet, versus tens of feet, allowing the use of GPS for precision approaches all the way down to a runway's surface. WAAS corrects for GPS signal errors caused by ionospheric disturbances, timing errors, and satellite orbit errors. It also provides integrity information regarding the health of each GPS satellite.
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