Glossary of Airline Terminology

Wide Area Augmentation System (WAAS)

A navigation system developed by the Federal Aviation Administration, which is accurate down to three meters (approximately 95 percent of the time). Accuracy is achieved through corrections to the surveyed location of 25 wide-area reference stations on the ground and the Global Positioning System (GPS) signal. WAAS was commissioned in July 2003, and is currently used solely by general aviation.

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