It provides high-accuracy geo-positioning (with position accuracy of less than 3 meters) by supplementing data from the Global Positioning System (GPS).
The system also calculates differential corrections and data integrity messages for satellites visible from a network of monitoring stations.

Launched in 2009, EGNOS consists of three geostationary satellites and a network of ground stations, and is a precursor of the Galileo positioning system. Since 2011, the system has been available for air navigation services, with a particular application in supporting the landing phase.

During the design, development and introduction of the EGNOS service, ENAV experts participated in the definition and verification of its mission and operational requirements. ENAV is a participant in ESSP, the company that provides the EGNOS service.