Navigation with Indian Constellation (NAVIC)

NavIC (Navigation with Indian Constellation) is India’s regional satellite navigation system, developed by the Indian Space Research Organisation (ISRO). Earlier known as the Indian Regional Navigation Satellite System (IRNSS), it is designed to provide positioning, navigation and timing services over India and approximately 1,500 km beyond its boundary. It acquired the name NavIC in April 2016.

How satellite navigation works

Navigation satellites broadcast signals carrying precise time and orbital information. A compatible receiver uses the signals’ travel times to estimate its distances from satellites and calculate its position. Atomic clocks support the precise timing needed for these measurements.

A conventional position-and-time solution requires observations from at least four satellites because the receiver must determine its three-dimensional position and its clock offset. Satellite navigation supplies location and timing information; it does not produce imagery of the Earth’s surface.

NavIC’s architecture and coverage

The original NavIC design comprises seven satellites: three in geostationary orbits and four in inclined geosynchronous orbits. Ground facilities monitor the spacecraft, maintain timing and generate navigation information. Compatible user receivers form the third segment of the system.

This seven-satellite design should be distinguished from the number currently capable of providing navigation signals. Satellites may remain in orbit after losing their navigation capability, and some can be used for other functions.

Services and signal bands

• Standard Positioning Service (SPS): the civilian service.
• Restricted Service (RS): the encrypted service for authorised users.

NavIC’s original navigation signals use the L5 and S bands. The second-generation NVS satellites add an L1 signal to widen civilian use and improve compatibility with other navigation systems. NVS-01 and NVS-02 were configured with L1, L5 and S navigation payloads.

ISRO specifies a civilian position-accuracy design target better than 20 metres at the stated 2-sigma level over the primary service area. This specification is not a guarantee of uninterrupted positioning under every operational condition.

Operational status and satellite replenishment

In a Lok Sabha reply dated 29 July 2026, the Department of Space reported that three satellites—IRNSS-1B, IRNSS-1I and NVS-01—were providing positioning, navigation and timing signals after IRNSS-1F completed its mission life. The government stated that this was insufficient for NavIC to provide standalone positioning, although its timing service remained functional. It also reported the use of multi-constellation GNSS, including NavIC, by the Armed Forces.

The distinction is important: receiving NavIC signals as part of a multi-constellation solution does not demonstrate that NavIC alone can provide a complete positioning service.

ISRO’s second-generation programme envisages five satellites, NVS-01 to NVS-05, to strengthen service continuity and add capabilities. NVS-01 launched on 29 May 2023 and carried an indigenous atomic clock.

NVS-02 launched on 29 January 2025, but could not complete the orbit-raising manoeuvres needed to reach its intended operational orbit. ISRO’s investigation, published on 25 February 2026, identified a failure of the drive signal to reach an oxidiser-line pyro valve. The committee considered disengaged connector contacts the most likely cause and recommended measures to improve reliability.

The July 2026 parliamentary reply described NVS-03 as ready for launch and NVS-04 and NVS-05 as being at an advanced stage of development. A 22 October 2026 Indian Express report, citing the ISRO Chairman, identified 30 October as the target for an NVS-03 launch attempt. This is a reported launch plan, not confirmation of launch or restored navigation service. Operational restoration must be assessed after successful deployment, testing and commissioning.

Applications and receiver requirements

Satellite navigation supports road and rail transport, maritime navigation, surveying, precision agriculture, search and rescue, and location-based services. Precise timing also supports synchronisation applications. NavIC has a one-way messaging capability used to convey emergency warnings to fishermen beyond terrestrial network coverage.

Using NavIC requires compatible receiver hardware and signal decoding. A location application alone cannot add NavIC reception to an unsupported device. Multi-constellation receivers can combine signals from different systems and use global systems outside NavIC’s regional service area.

NavIC, GPS and GAGAN

GPS is the United States’ navigation system, while GLONASS, Galileo and BeiDou are other global systems. NavIC is regional. Its signals are designed for interoperability, so a receiver may use NavIC alongside global constellations.

GAGAN, developed jointly by ISRO and the Airports Authority of India, is a satellite-based augmentation system. It provides correction and integrity information for GPS, principally for civil aviation. NavIC is a separate navigation constellation.

Why NavIC matters

NavIC’s purpose is to give India greater control over navigation infrastructure and reduce dependence on foreign systems, particularly for strategic requirements. Achieving that objective requires a sustained operational constellation, reliable clocks, timely replacement satellites and compatible receivers. Its strategic value therefore depends on maintaining the service as well as developing the technology.