India on 13th July 2015 became only the fourth nation to have inter-operable Satellite Based Augmentation System (SBAS). 
Union Minister of Civil Aviation P Ashok Gajapathi Raju formally launched the GPS Aided Geo Augmented Navigation system in New Delhi.
What is this system, for which even the ‘Sky’ is not the limit, aptly named? 
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GAGANThe acronym of GPS Aided Geo Augmented Navigation becomes GAGAN. The system is inter-operable with other international SBAS systems like US-WAAS, European EGNOS, and Japanese MSAS etc. It has been developed at an estimated cost of Rs.774 Crore.