How GAGAN Gave India the World’s First SBAS Certified for Vertical-Guidance Approaches Near the Equator

India’s aerospace story is increasingly about more than assembling aircraft or supplying components to global manufacturers. The country is also building the navigation, satellite and digital infrastructure that modern aviation depends on.

One of the clearest examples is GAGAN — GPS Aided GEO Augmented Navigation, India’s indigenous Satellite-Based Augmentation System developed jointly by the Indian Space Research Organisation and the Airports Authority of India.

GAGAN improves the accuracy and integrity of GPS signals for aircraft navigation and provides pilots with reliable positioning information during different phases of flight.

India fully operationalised the system in May 2015, becoming one of a small group of countries with an operational satellite-based augmentation system.

More than a decade later, GAGAN is beginning to play a larger operational role in Indian civil aviation.

First GAGAN Approach by a Commercial Jet

A major milestone came in June 2026, when the Directorate General of Civil Aviation successfully conducted India’s first satellite-based landing-system approach by a commercial jet using GAGAN.

The achievement demonstrated that the system can support precision approach procedures for larger commercial aircraft and not merely regional or experimental operations.

For Indian aviation, this is important because satellite-based navigation can reduce dependence on conventional ground-based navigation infrastructure at airports.

That becomes particularly valuable as India expands air connectivity to smaller cities and regional airports.

How GAGAN Works

GAGAN does not replace GPS.

Instead, it monitors GPS signals across India, calculates corrections and broadcasts additional integrity information to suitably equipped aircraft.

The system currently operates through 15 Indian Reference Stations, two Indian Master Control Centres and three Indian Land Uplink Stations.

Three geostationary satellites — GSAT-8, GSAT-10 and GSAT-15 — carry GAGAN navigation payloads and broadcast the corrected signals to users.

The ground stations continuously monitor satellite-navigation signals and identify errors. Corrections are calculated at the master control centres and transmitted through the uplink stations to the geostationary satellites, which then rebroadcast them over the region.

This allows suitably equipped aircraft to determine their position with greater accuracy while also receiving information about the integrity and reliability of the navigation signal.

Designed for India’s Difficult Ionospheric Environment

Developing GAGAN presented a particular technical challenge because India lies close to the geomagnetic equator, where ionospheric disturbances can affect satellite-navigation signals.

India consequently became the first country to develop an SBAS certified for Approach with Vertical Guidance operations in the equatorial ionospheric region.

That achievement required Indian scientists and engineers to develop models capable of accounting for the unusual ionospheric conditions encountered across the region.

GAGAN was certified for en-route operations before progressively gaining approval for more demanding aviation applications.

Compatible With International Navigation Systems

GAGAN was developed in accordance with international civil-aviation standards and is designed to be interoperable with other satellite-based augmentation systems.

These include the United States’ Wide Area Augmentation System, Europe’s EGNOS and Japan’s MSAS.

Interoperability is important because international aircraft operating between different regions need navigation systems that function within a common global aviation framework.

GAGAN therefore gives India an indigenous aviation-navigation capability while remaining compatible with the broader international satellite-navigation ecosystem.

GAGAN and NavIC Serve Different Roles

GAGAN is sometimes confused with NavIC, but the two systems perform different functions.

NavIC is India’s independent regional satellite-navigation constellation. It provides positioning, navigation and timing services across India and approximately 1,500 kilometres beyond the country’s boundary.

GAGAN, by contrast, augments GPS signals specifically to improve their accuracy and integrity for safety-critical applications such as aviation.

The two systems therefore complement each other.

NavIC gives India an independent regional navigation capability, while GAGAN provides a high-integrity augmentation service designed primarily around civil aviation requirements.

Together they represent important elements of India’s growing sovereign navigation infrastructure.

Navigation Technology Expands Beyond Aviation

Although GAGAN was developed primarily for aviation, its potential applications extend much further.

Government assessments have identified possible uses in maritime navigation, railways, road transport, disaster management, defence and security, telecommunications, surveying and mapping.

Accurate positioning combined with integrity information can be useful wherever users need confidence not only about where they are, but also about whether the navigation information they are receiving can be trusted.

This makes satellite-navigation infrastructure increasingly relevant as autonomous systems, drones and digitally connected transport networks expand.

India Takes NavIC Cooperation Overseas

India’s navigation ecosystem is also beginning to develop an international dimension.

In 2025, India and South Africa agreed to establish a NavIC reference station in South Africa, extending cooperation in satellite-based navigation.

Such reference stations can contribute to research, signal monitoring and evaluation of NavIC services beyond India.

The move reflects a broader effort to establish Indian-developed navigation technologies as part of international scientific and technological cooperation.

Aerospace Manufacturing Expands Alongside Navigation Capability

GAGAN and NavIC are developing at the same time that India is becoming a larger part of the global aerospace manufacturing supply chain.

Both Airbus and Boeing now source more than $1 billion worth of components and services annually from India.

Airbus says its sourcing from India has reached around $1.4 billion annually, while Boeing states that its Indian sourcing exceeds $1.4 billion a year.

Indian suppliers are moving into increasingly complex areas of aerospace manufacturing, including precision engine components, structural assemblies, landing-gear parts and high-value machined components.

Companies such as Aequs, Azad Engineering, Dynamatic Technologies, Bharat Forge, Motherson and Sansera Engineering have expanded their presence in global aerospace supply chains.

The significance is not simply the value of exports.

The type of work moving to India is becoming more technologically demanding, requiring tighter tolerances, specialised materials, advanced manufacturing processes and international aerospace certification.

From Component Supplier to Technology Builder

For many years, India’s role in global civil aviation was largely that of an aircraft buyer.

That picture is changing.

Indian companies are increasingly becoming suppliers to global aircraft programmes, while domestic programmes are expanding into aircraft assembly, engine components, avionics, satellite navigation and airport technologies.

At the same time, India is attempting to develop a domestic civil-aircraft manufacturing ecosystem through initiatives involving regional aircraft and international partnerships.

The combination of GAGAN, NavIC and a growing aerospace manufacturing base illustrates a broader transition.

India is no longer participating in aviation only at one point in the value chain. It is developing capabilities ranging from precision aerospace manufacturing and aircraft engineering to satellites, navigation signals and digital aviation infrastructure.

GAGAN is particularly important in that story because it represents technology that India designed and operates for one of aviation’s most safety-critical requirements.

The June 2026 commercial-jet approach demonstrated that this indigenous infrastructure is moving beyond technological capability towards wider operational use.

As Indian aerospace manufacturing expands and domestic air connectivity reaches more regional airports, systems such as GAGAN could become an increasingly important part of the infrastructure supporting that growth.

---

References

Airports Authority of India — GAGAN
Official technical information on India’s GPS Aided GEO Augmented Navigation system, its architecture and aviation applications.

Indian Space Research Organisation — GAGAN and NavIC
Official information on India’s satellite-navigation programmes and NavIC service coverage.

Press Information Bureau / Ministry of Civil Aviation — 2026
Official confirmation of India’s first satellite-based landing-system approach by a commercial jet using GAGAN.

Boeing India
Official information on Boeing’s annual aerospace sourcing from Indian suppliers.

Airbus India
Official information on Airbus sourcing and expansion of its Indian aerospace supply chain.

---