The Wide Area Augmentation System and the Continuously Operating GPS Reference Stations exist to increase the accuracy of GPS measurements.

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Both systems, Wide Area Augmentation System and Continuously Operating GPS Reference Stations, were developed to improve the accuracy of GPS measurements. The Wide Area Augmentation System works by using ground-based reference stations that monitor GPS satellite signals and send corrections to a network of geostationary satellites, which then broadcast the corrected signals to GPS receivers. Continuously Operating GPS Reference Stations consist of a network of GPS receivers that collect data and provide information for surveying, mapping, and other applications, allowing for more precise measurements.