EGNOS, the European Geostationary Navigation Overlay Service, is Europe’s first venture into satellite navigation. EGNOS broadcasts augmented information through a trio of geostationary satellites linked to a network of monitoring ground stations, to sharpen the accuracy and reliability of US GPS signals across the continent.
Its development was managed by the European Space Agency (ESA) under a tripartite agreement with the European Commission (EC) and the European Organisation for the Safety of Air Navigation (Eurocontrol). The ownership of the EGNOS assets was transferred from ESA to the EC in April 2009 and EGNOS officially entered service on 1 October 2009. The service is delivered, through a contract with the European GNSS Service Agency (GSA), by the European Satellite Services Provider, ESSP SaS, founded by seven air navigation service providers. ESA is the design and procurement agent for EGNOS on behalf of the EC.