GAGAN
India's Satellite-Based Augmentation System (SBAS)
GAGAN is a Satellite-Based Augmentation System (SBAS) jointly developed by the Airports Authority of India (AAI) and the Indian Space Research Organisation (ISRO). It augments the GPS Standard Positioning Service (SPS) signal using a network of ground reference stations across India that measure GPS signal errors, compute corrections, and uplink these corrections to geostationary satellites, which then broadcast them to aircraft receivers.
- GAGAN was declared operational for RNP 0.1 (en-route) services in 2013 and for APV I (Approach with Vertical guidance, Level I) services in 2015 after DGCA certification.
- The system provides navigational accuracy of approximately 3 metres horizontal and 4 metres vertical — sufficient for precision approach operations.
- India is the first country in the Asia-Pacific region to develop and certify an indigenous SBAS, and one of only four globally, alongside WAAS (USA), EGNOS (Europe), and MSAS (Japan).
- GAGAN signal is accessible across the Indian Flight Information Region (FIR), covering India, Nepal, Bhutan, Sri Lanka, Bangladesh, and parts of the Indian Ocean.
● Tracked since June 27, 2026 · last seen July 01, 2026 · updates as the daily brief publishes
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