A network of precisely surveyed ground reference stations is strategically positioned across a geographic coverage region to collect Global Navigation Satellite Systems (GNSS) navigation data. Using this information, a System User Message is generated to either correct GNSS signal errors or provide notice to users of potential signal errors. These correction messages are then broadcast through specialized Navigation Transponders on GEO satellites via GNSS-like signals to an SBAS avionics receiver onboard service user aircraft.


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