Galileo, the joint initiative of the European Commission and the European Space Agency, is becoming a reality. Once the Galileo network of 30 satellites is complete, the system will be able to provide numerous navigational services on and around the Earth. Accurate navigation and search and rescue operations are just two of many possible examples. While waiting for Galileo to become operational, Europe already has a positioning system in place: EGNOS, a network of ground stations transmitting GPS enhancement signals via geostationary satellites.