What does EGNOS provide in terms of GPS technology?

EGNOS, which stands for the European Geostationary Navigation Overlay Service, is a satellite-based augmentation system (SBAS) that enhances the accuracy and reliability of Global Positioning System (GPS) signals across Europe. It achieves this by using a network of ground stations to collect GPS satellite data, which is then transmitted via geostationary satellites to GPS receivers. This additional information helps to improve positioning accuracy by correcting signal errors caused by atmospheric conditions and other factors.

The focus of EGNOS specifically on providing an augmentation service within the European region is what makes the correct answer stand out. It is designed to support various applications beyond just navigation, including aviation, which requires high precision for safety reasons. Therefore, identifying EGNOS as an SBAS covering Europe accurately reflects its purpose and functionality in the realm of GPS technology.