EGNOS (European Geostationary Navigation Overlay Service) is Europe's first concrete venture into satellite navigation. Essentially a ‘pre-Galileo' system, EGNOS uses geostationary satellites and a network of ground stations to receive, analyse and augment GPS, and in the next version Galileo signals.
EGNOS makes existing satellite navigation signals suitable for safety critical applications such as flying aircraft or navigating ships through narrow channels. EGNOS was certified for civil aviation in 2011.
EGNOS increases the accuracy of existing satellite positioning signals while providing a crucial ‘integrity message', informing users in the event of signal problems. It also transmits an extremely accurate universal time signal.
For more information about EGNOS, see the EGNOS Portal.