The Satellite Based Augmentation Systems are becoming more and more common. The US WAAS was certified in 2003, the Japanese MTSAT in 2007. Europe should certify EGNOS in 2009, maybe.. "Maybe" because in the last years the delays were ordinary.. While Europe is still working on EGNOS, the Indian system GAGAN is moving forward. On July 15, Raytheon announced that "is leading a team to deliver a comprehensive solution for the Indian Space Research Organization and Airports Authority of India global navigation satellite systems." Come on EGNOS!