GLONASSARY

WAAS (Wide-Area Augmentation System) – This correction service, developed by the Federal Aviation Administration (FAA), is free to use and provides coverage across the US along with part of Canada and Mexico. Many GPS receivers (especially mapping and navigational units) produced today utilize WAAS correction signals. Through a network of ground-based reference stations and two geostationary satellites, the corrections are broadcast to an L1-capable, DGPS-enabled receiver. Some manufacturers that utilize WAAS for their guidance systems report pass-to-pass dynamic accuracies of 6 – 8 inches; however, static accuracy is typically under 10-ft.

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