ESSP SAS (European Satellite Services Provider) is a European private company under French law whose shareholders are 7 key Air Navigation Service Providers: • DFS Deutsche Flugsicherung (Germany) • DSNA Direction des Services de la Navigation Aérienne (France) • ENAIRE (Spain) • ENAV L'Ente Nazionale Assistenza al Volo (Italy) • NATS National Air Traffic Services (United Kingdom) • NAV Navegação Aérea de Portugal (Portugal) • Skyguide Schweizerische Aktiengesellschaft für zivile und militärische Flugsicherung (Switzerland) ESSP acts as the service provider for EGNOS, the European Geostationary Navigation Overlay Service. EGNOS is a satellite based augmentation system which delivers precise satellite positioning and makes GPS suitable for safety critical applications such as flying aircraft or navigating ships through narrow channels. The company is based in Toulouse (France) and Madrid (Spain).