Satellite Based Augmentation Systems (SBAS) for the Global Positioning System (GPS) have been developed in several countries, and will soon provide coverage over a large portion of the globe. As these systems continue to proliferate, it becomes increasingly important that they work together to provide seamless capability worldwide. The International Civil Aviation Organization (ICAO) maintains standards to insure that these systems are interoperable, and that they support flight operations within the coverage areas of the different systems. In the summer of 2012, the FAA conducted several flights in order to demonstrate SBAS interoperability. An instrumented FAA aircraft was flown from the U.S. to airports in the coverage areas of EGNOS and MSAS. The aircraft was equipped with several WAAS receivers which have received an FAA TSO approval for use in en route, NPA, and LPV operations. Data were collected as the aircraft flew through the transition area from one SBAS region to the other, and also during approaches to airports with available SBAS procedures.
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