= Wide Area Augmentation System
{wiki=Wide_Area_Augmentation_System}
The Wide Area Augmentation System (WAAS) is a satellite-based augmentation system developed to improve the accuracy and reliability of Global Positioning System (GPS) signals. It is primarily used in the United States and its service areas include much of North America. WAAS works by using a network of ground reference stations that monitor GPS satellite signals. These stations calculate corrections based on their known positions and the discrepancies in GPS data they receive.
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