If a GPS receiver is equipped with WAAS, what is the expected position accuracy?

When a GPS receiver is equipped with WAAS (Wide Area Augmentation System), it enhances the accuracy of the positioning information provided by the GPS. WAAS uses ground-based reference stations that monitor GPS signals and send correction messages to satellites, which then relay these corrections to GPS receivers. This process significantly reduces errors caused by factors such as atmospheric conditions and satellite orbit inaccuracies.

The addition of WAAS typically results in a horizontal position accuracy of less than 3 meters, which is superior to standard GPS accuracy, which can be within about 10 to 15 meters under optimal conditions. This precise accuracy makes WAAS-equipped GPS systems very reliable for aviation navigation, particularly for approaches and landings at airports equipped with WAAS procedures.

This capability of WAAS to provide such high accuracy is particularly valuable in aviation, where precise navigation is crucial for safety and operational effectiveness. Consequently, the accuracy indicated by the correct answer aligns with the technical specifications and operational benefits of WAAS technology.