Why in News
🗞️ Why in News On June 27, 2026, the Directorate General of Civil Aviation (DGCA) conducted India’s first satellite-based-augmentation-system approach on a jet aircraft, an IndiGo Airbus A320, at Udaipur airport using the indigenous GAGAN system.
This made IndiGo the first airline in India to land a jet aircraft using GAGAN with a Localiser Performance with Vertical Guidance (LPV) approach, a significant step for the safety and connectivity of smaller regional airports.
What is GAGAN?
GAGAN (GPS Aided GEO Augmented Navigation) is India’s indigenous Satellite-Based Augmentation System (SBAS) for civil aviation. It was jointly developed by the Indian Space Research Organisation (ISRO) and the Airports Authority of India (AAI).
An SBAS improves the accuracy, integrity and availability of satellite navigation signals (such as GPS) using a network of ground reference stations and geostationary satellites. This makes the position information reliable enough for precision aircraft approaches and landings.
India in an Exclusive Club
India is among the few nations with its own operational SBAS; with GAGAN’s certification in 2015 it became the fourth, after the United States, Japan and Europe. The global SBAS systems are listed below.
Correction (September 23, 2026): This article originally said India was the first in the Asia-Pacific region to have its own SBAS. Japan’s MSAS was certified in 2007, before GAGAN (2015), so India was the fourth country or region with a certified SBAS, not the first in Asia-Pacific.
| System | Region / Country | Operator |
|---|---|---|
| GAGAN | India | ISRO + AAI |
| WAAS | United States | FAA |
| MSAS | Japan | JCAB |
| EGNOS | Europe | ESA / EU |
Why LPV Approaches Matter
GAGAN enables LPV (Localiser Performance with Vertical Guidance) precision approaches. An LPV approach gives pilots both horizontal (lateral) and vertical guidance during the final descent, similar to a conventional Instrument Landing System (ILS), but without the need for expensive ground-based ILS equipment at every airport.
This is transformative for smaller airports that lack an ILS. Using only satellite signals, aircraft can make safe, precise approaches even in poor visibility, directly supporting India’s regional connectivity scheme UDAN (Ude Desh ka Aam Naagrik) and improving safety at Tier-2 and Tier-3 airfields.
Analysis and Way Forward
The Udaipur jet landing demonstrates that GAGAN has matured from a navigation aid into an operational tool for commercial jet operations. The strategic value is twofold: it reduces dependence on costly ground infrastructure and reduces reliance on foreign navigation systems, strengthening India’s aviation self-reliance under Atmanirbhar Bharat.
The way forward lies in scaling up GAGAN-based LPV approaches across the network of regional airports, mandating GAGAN-capable avionics in newer fleets, and extending GAGAN’s benefits to non-aviation sectors such as railways, agriculture, disaster management and precision timing. Wider adoption will help unlock the full economic potential of the indigenous system.
UPSC Relevance
GS Paper 3 (Science and Technology): Indigenisation of technology; achievements of Indians in science and technology; space applications.
Prelims pointers:
- GAGAN = GPS Aided GEO Augmented Navigation; an SBAS developed jointly by ISRO and AAI.
- First jet (IndiGo A320) GAGAN landing on June 27, 2026, at Udaipur airport; conducted by the DGCA.
- India was the fourth to certify an SBAS, after the US (WAAS), Japan (MSAS) and Europe (EGNOS).
- Other SBAS: WAAS (USA), MSAS (Japan), EGNOS (Europe).
- LPV = Localiser Performance with Vertical Guidance; supports the UDAN scheme.
Mains question: “Indigenous satellite-based augmentation systems like GAGAN can transform regional air connectivity and reduce dependence on foreign navigation infrastructure. Discuss.” (15 marks, 250 words)
Facts Corner
📌 Facts Corner, Knowledgepedia
- GAGAN: GPS Aided GEO Augmented Navigation, India’s indigenous Satellite-Based Augmentation System (SBAS).
- Developed by: ISRO (Indian Space Research Organisation) and the Airports Authority of India (AAI).
- Milestone: First jet aircraft (IndiGo Airbus A320) landing using GAGAN, on June 27, 2026, at Udaipur airport, conducted by the DGCA.
- Fourth certified SBAS (2015); peers are WAAS (USA), MSAS (Japan), EGNOS (Europe).
- LPV: Localiser Performance with Vertical Guidance, gives both lateral and vertical guidance without ground-based ILS.
- Benefit: Precision approaches at airports without ILS, boosting safety and the UDAN regional connectivity scheme.
Sources: Airports Authority of India, ISRO, DGCA
Source: India Conducts First Jet Landing Using Indigenous GAGAN System — Ujiyari.com | Free UPSC & State PCS Current Affairs
