GAGAN provides the Ionosphere, Satellite Clock and Satellite Ephemeris (ICE) corrections to the users in its coverage area. These corrections are generated by using the GPS measurement data collected from the Reference stations, hence there may be occasions where the GAGAN accuracy may be less than that of GPS due to some local phenomena not observed by the reference stations. But the GAGAN system ensures that all the users in its service volume are always protected within the integrity bounds for a particular level of service. The integrity requirement as specified by ICAO is 1-2x10-7/app.

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