High Quality Content by WIKIPEDIA articles! The European Geostationary Navigation Overlay Service is a satellite based augmentation system under development by the European Space Agency, the European Commission and EUROCONTROL. It is intended to supplement the GPS, GLONASS and Galileo systems by reporting on the reliability and accuracy of the signals. The official start of operations was announced by the European Commission on 1 October 2009. According to specifications, horizontal position accuracy should be better than seven metres. In practice, the horizontal position accuracy is at the metre level. It will consist of three geostationary satellites and a network of ground stations.

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