What is the purpose of the Wide Area Augmentation System (WAAS)?

• A. To enhance the accuracy and reliability of GPS signals for aviation
• B. To provide weather radar data
• C. To replace VOR navigation
• D. To monitor runway conditions

Answer: (A)

WAAS exists to make GPS truly reliable for aviation by delivering corrections and integrity information to the GPS signals, greatly improving accuracy, reliability, and availability for flight navigation. It achieves this through a network of ground reference stations that monitor GPS signals, a master station that computes the necessary corrections, and geostationary satellites that broadcast those corrections to aircraft. When a WAAS-enabled receiver applies these corrections, position data becomes much more precise and trustworthy, enabling high-precision approaches with vertical guidance in many cases. This system does not provide weather radar data, does not replace VOR navigation, and does not monitor runway conditions.