What system broadcasts errors to a satellite and then to aircraft?

The Wide Area Augmentation System (WAAS) is designed specifically to improve the accuracy and reliability of GPS signals for aircraft navigation. It achieves this by receiving GPS signals on the ground, processing the information to identify any errors, and then broadcasting corrected signals back to aircraft via satellite. This correction capability is essential for precise navigation, especially in areas where GPS alone may not provide sufficient accuracy.

WAAS covers a broad geographical area, making it suitable for en route and terminal operations for aircraft flying at a high altitude or approaching airports. The system provides critical information that enhances safety, as it reduces the chance of navigational errors during crucial phases of flight.

Other choices, such as the Global Navigation Satellite System (GNSS), refer to a general system of satellite-based navigation rather than a specific approach for error correction. Local Area Augmentation System (LAAS) focuses on providing precise navigation for aircraft approaching and landing at specific airports but does so within a limited area. Ground-based Augmentation System (GBAS) is similar to LAAS but also operates in a more localized capacity. Thus, while there are other systems that enhance GPS, WAAS is specifically designed for wide-area application and error broadcasting to improve aircraft navigation.