The various Space Based Augmentation Systems (SBASSBAS —Space Based Augmentation System) use a series of devices that transmit differential corrections to aircraft via satellite. The systems all use this principle of operation but, unfortunately, have different names depending on where in the world you are. The method of transmission here is the essential difference with GBASGBAS —Ground Based Augmentation System, (Ground Based) where differential corrections are transmitted directly to the aircraft (ie not via satellites). SBASSBAS —Space Based Augmentation System are an enhancement to and different from the GNSSGNSS —Global Navigation Satellite System systems, so if you get this question, eliminate the various actual GNSSGNSS —Global Navigation Satellite System systems themselves as wrong answers.

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Which of the following are current SBASSBAS —Space Based Augmentation System systems?