What system is referred to by the acronym WAAS?

The acronym WAAS stands for the Wide Area Augmentation System. This is a satellite-based augmentation system that enhances the accuracy of GPS signals for aviation and other applications. WAAS improves the precision of GPS information by correcting signal errors caused by factors such as atmospheric disturbances, satellite orbit errors, and time synchronization discrepancies. By utilizing a network of ground reference stations, WAAS provides differential corrections to GPS signals, thereby allowing for more reliable positioning and navigation, particularly for critical applications like aircraft landing.

The other options do not accurately describe the system utilized for augmenting GPS signals. For instance, the term "Wide Application Augmentation System" suggests a focus on broad application rather than aviation-specific enhancements. "World Area Augmentation System" and "Worldwide Augmentation Assistance System" do not correctly represent the established name and function of the WAAS, which is specifically designed for a wide area, hence the term “Wide Area” in its title.