The project involves development of indigenous technology in frontier areas. Project has numerous benefits to the aviation sector and would enable aircraft to navigate on a straight path/route instead of navigating in zig-zag path over land based stations. This system would also enable multiple approach capability.
Further, with the help of GAGAN, it would be possible to provide coverage of oceanic areas, which is not possible by terrestrial systems; improve airport and airspace access in all weather conditions; enhance reliability and reduce delays; provide uniform and accurate navigation performance over the entire airspace; provide fuel efficient air corridors and provide CAT-I approach without ground element support.
Broadly, the project would result in fuel savings/efficiency for airlines and enable higher air traffic within the limited airspace.
SOURCE: http://www.india-defence.com/reports-4012