EGNOS

Acronym for European Geostationary Navigation Overlay Service. A Satellite-Based Augmentation System (SBAS) used to improve the accuracy of GPS. The system consists of ground stations to produce correction data, and satellites that send the data to the GPS Receiver in the same Frequency Range used for GPS signals. The system is expected to provide positioning accuracy better than 2m 99% of the time. EGNOS is the European variant of >WAAS, the Indian version is the GPS Aided Geo Augmented Navigation (GAGAN) and the Japanese have Multi-functional Satellite Augmentation System (MSAS).