European Geostationary Navigation Overlay Service (EGNOS)

The European Geostationary Navigation Overlay Service (EGNOS) is a satellite-based augmentation system that enhances the accuracy, integrity, and reliability of GPS signals across Europe. By receiving data from ground stations and transmitting corrections via geostationary satellites, EGNOS improves positioning precision for various applications, such as aviation, maritime, and land navigation. It acts as a "quality control" system for satellite signals, ensuring users receive more trustworthy and precise location information, which is especially critical for safety-sensitive operations and precise measurement tasks.