What does WAAS stand for?

WAAS stands for Wide Area Augmentation System, which is a system developed to enhance the accuracy and reliability of GPS signals for aviation use. It is designed to improve the precision of navigation signals by providing differential corrections to the data received by GPS receivers. This enables better accuracy, especially in critical applications such as precision approaches and landings, which are essential for maintaining safety in aviation operations. The system employs a network of ground reference stations that monitor GPS signals and send correction information to geostationary satellites, which then relay the improved data back to users on the ground. This augmentation allows aircraft to operate in various conditions with increased confidence in their navigational accuracy.