Following the Performance-Based Navigation system (PBN) and the air traffic control automation, in 2011, the AAI initiated a pilot project on a Ground-Based Augmentation System (GBAS), as part of implementing Gagan (Geo Augmented Navigation) in the country. There will be a set of 3–4 GPS satellites, one geo-synchronous satellite, GPS receivers at end of the runways, a ground station and a VHF data broadcast system. When the pilot project starts, Chennai airport will be the first airport in the country to have the facility.