🚀 Science
ISRO to launch NVS-03 on Friday to revive India's NavIC navigation service
In 60 seconds: ISRO will launch the NVS-03 navigation satellite on a GSLV-F18 rocket from Sriharikota on Friday, 30 October. The satellite weighs about 2,250 kg, carries an indigenous atomic clock and adds a new L1 signal. NavIC now has only three working satellites, one short of the four needed for standalone positioning, so a successful launch could restore India's own navigation service.
Why it matters
Phones, ships, trains, the armed forces and power grids rely on satellite navigation and timing. NavIC means India need not depend fully on foreign systems like the US GPS.
Explain it simply
To find your table in a big chai shop, you need at least four waiters calling out from different corners. NavIC has only three right now; NVS-03 is the fourth voice.
The 3-minute read
What happened
GSLV-F18 is the 20th flight of the Geosynchronous Satellite Launch Vehicle. It will lift off from the Second Launch Pad at the Satish Dhawan Space Centre and place NVS-03 in a geosynchronous transfer orbit of about 170 km by 37,023 km.
Background
The working satellites are IRNSS-1B, IRNSS-1I and NVS-01. The Department of Space told Parliament in July that at least four are needed for standalone positioning; with three, NavIC gives timing but not location.
How it works
The rocket is about 50 m tall and weighs about 420 tonnes at lift-off; its third stage burns liquid hydrogen and liquid oxygen. After separation, the satellite must use its own engine to climb to its final orbit.
What's next
After reaching orbit, the satellite will go through tests before it starts service. NVS-04 and NVS-05 are being built.
What it means for you
Many phones sold in India already support NavIC. Once the service is fully restored, maps and location apps can use it alongside GPS.
Key numbers
- ~2,250 kg: Mass of NVS-03
- 20th: Flight of GSLV
- 3 of 4: Working satellites vs minimum needed
- 1,500 km: Coverage beyond India's borders
Both sides
- ISRO: NVS-03 will continue navigation services and adds an indigenous atomic clock and the L1 signal.
- Critics: Repeated satellite failures have left NavIC unable to give location for a long time.
Key terms explained
- Atomic clock
- An extremely precise clock; navigation satellites need one to tell receivers exact time and position.
- NavIC
- India's own regional satellite navigation system run by ISRO.
The story so far
- May 2023: NVS-01, the first second-generation NavIC satellite, is launched. ISRO launched NVS-01 on a GSLV rocket in May 2023. It was the first of a new series meant to replace the ageing IRNSS satellites, several of which had atomic clock problems.
- Jan 2025: NVS-02 reaches space on ISRO's 100th Sriharikota launch but gets stuck in the wrong orbit. GSLV-F15 placed NVS-02 in orbit in January 2025, but the satellite's engine could not fire to raise its orbit because valves did not open. ISRO's review traced this to a faulty electrical connector.
- Today: NVS-03 set for launch on 30 Oct to restore NavIC
Exam notes (UPSC, SSC, Banking, PSC)
- NavIC (Navigation with Indian Constellation) was earlier called IRNSS; it covers India and about 1,500 km beyond.
- GSLV uses an indigenous cryogenic upper stage (liquid hydrogen and liquid oxygen).
- A geosynchronous transfer orbit (GTO) is an elliptical orbit from which a satellite climbs to geosynchronous orbit.
- The Satish Dhawan Space Centre (SHAR) is at Sriharikota, Andhra Pradesh.
Likely exam question: Why does India need its own regional navigation system? Discuss NavIC's progress and setbacks.