The Wide Area Augmentation System (WAAS) is an extremely accurate navigation system developed for the Federal Aviation Administration (FAA) which compliments GPS. WAAS allows the U.S. National Airspace System (NAS) to provide precision vertical and horizontal navigation approach operations as well as provide services for all classes of aircraft in all phases of the flight.
Hosted on SES-15 and other commercial satellites to provide system resiliency, these navigation hosted payloads receive and broadcast messages on GPS frequencies to provide safety-of-flight information across the NAS.