Satellite Based Augmentation Systems (SBAS) for theGlobal Positioning System (GPS) have been developed inseveral countries, and will soon provide coverage over alarge portion of the globe. As these systems continue toproliferate, it becomes increasingly important that theywork together to provide seamless capability worldwide.The International Civil Aviation Organization (ICAO)maintains standards to insure that these systems areinteroperable, and that they support flight operationswithin the coverage areas of the different systems.In the summer of 2012, the FAA conducted several flightsin order to demonstrate SBAS interoperability. Aninstrumented FAA aircraft was flown from the U.S. toairports in the coverage areas of EGNOS and MSAS. Theaircraft was equipped with several WAAS receivers whichhave received an FAA TSO approval for use in en route,NPA, and LPV operations. Data were collected as theaircraft flew through the transition area from one SBASregion to the other, and also during approaches toairports with available SBAS procedures.In the North Atlantic, two oceanic crossings were flownin each direction to explore the transition regions ofoverlapping coverage, and several LPV approaches wereflown to Alderney, in the Channel Islands. In the Pacific,the aircraft was flown to Guam to observe performancein an MSAS‐only environment..
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