Live health of every NavIC satellite, measured independently from open GNSS receiver data in India and around the Indian Ocean.
NavIC From NavIC signals and navigation messages at the monitoring stations. Coverage and sources
Drag to rotate, scroll or pinch to zoom, click a satellite for details. Positions from CelesTrak orbital elements (SGP4), health from NavIC signals, land and coastlines from Natural Earth.
NavIC satellites hover over the Indian Ocean. GEO satellites stay almost fixed, while inclined (IGSO) satellites trace a slow figure-8 every day. Lines show the next 24 hours.
CelesTrakNavIC Positions from CelesTrak orbital elements, so they work for any place. Satellite health is from NavIC signals.
You stand in the middle; the dome is the sky, the rim is the horizon. Drag to look around.
Elevation = height above the horizon (90° = straight up). Azimuth = compass direction (0° north, 90° east). Positions from CelesTrak orbital elements.
The ionosphere is a layer of charged gas 80–1000 km up. It slows satellite signals and is the biggest error source for phones and single-frequency receivers. Over India it is especially strong, because the equatorial anomaly lies right across the country.
GPSNavIC Measured mainly with GPS signals from receivers that also track NavIC; NavIC-only values where available (Lucknow S-band). Best near the stations: see coverage.
Electron content now versus its usual level at the same time of day (median of the previous 27 days). Geomagnetic storms push it far above or below normal for hours to days.
Each column (3D) or dot (map) is where a satellite signal crosses the ionosphere, 350 km up. Column height and colour show the electron content; wider columns and larger dots are NavIC. Hover for values.
From Lucknow (LCK4), the only public station recording NavIC's S-band. Calibrated to GPS.
Maximum rate-of-TEC index per 5 minutes. Spikes after sunset often mean equatorial plasma bubbles.
Carrier-to-noise density (C/N0) of the NavIC L5 signal at each receiver. A sudden drop on one satellite points to the satellite. A drop on all satellites at one station points to local interference or jamming.
NavIC Measured directly on NavIC signals at each station.
NavIC satellites hang almost still over the Indian Ocean, so each receiver sees the same signal strength at the same (sidereal) time every day. Subtracting the previous days leaves a flat line near 0 dB. A drop on several satellites at once points to radio interference or a problem at the receiver; a drop on one satellite points to the satellite.
Each receiver estimates its clock once from GPS and once from NavIC. The difference reveals the NavIC–GPS system time offset, plus a constant receiver bias. Stability matters for telecom, power grids and banking, which use satellite time.
NavICGPS NavIC and GPS signals at the same receiver.
The af0 term each satellite broadcasts: how far its onboard atomic clock is from NavIC time. Jumps mark clock adjustments.
Every NavIC object in orbit, including NVS-02 (stranded in a transfer orbit since its 2025 engine failure) and the newly launched NVS-03 on its way to geosynchronous orbit.
Solar flares make the daytime ionosphere jump within minutes. Geomagnetic storms (high Kp) can disturb it for days. Both affect GNSS accuracy over India.
NOAAGFZGPS X-ray and Kp from NOAA and GFZ. The flare detector uses GPS signals at the monitoring stations.
A flare's X-ray and EUV burst ionises the whole sunlit ionosphere within a minute or two. Every GPS signal path then shows the same sudden increase in electron content. For each station we take the median rate of change over all its satellites, then combine every station where the ionosphere is sunlit. Independent noise averages out; a flare, seen everywhere at once, stands out. The line is in units of normal noise (σ). Crossing the red line (6σ) means a flare. Gaps are night over the whole network.
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Results from independent analysis of open receiver data, October–November 2026. Each finding links to the live page where you can check it yourself.
Only three satellites (IRNSS-1B, IRNSS-1I, NVS-01) broadcast usable navigation data. Positioning needs four. Five older satellites still transmit, but their atomic clocks have failed, so they only carry the messaging service. Phones keep working because they combine NavIC with GPS and other systems.
See the live status →NVS-02 was stranded in an elliptical transfer orbit in 2025. It still transmits navigation data, but that data describes a different orbit (eccentricity 0.37) from the one it actually flies (0.74, from CelesTrak tracking). Measured distances disagree with it by about 9,000 km, so the monitor marks it unusable.
See the orbits →A flare ionises the sunlit upper atmosphere within a minute, so every GPS signal path shows the same sudden jump in electron content. Tested on the X9.0 flare of 3 October 2024, the detector fired at all five stations at 12:15 UTC, three minutes before the X-ray peak. In blind tests on 26 days of 2026 data it found 5 of 6 M-class flares, including the M1.7 of 19 October, without being told about them. It also found one sharp C-class flare and raised no false alarms. It works by stacking all stations: a weak response that every station shows at the same moment cannot be noise.
See the flare detector →NavIC satellites hang almost still in the sky. That means each receiver sees the same signal strength at the same sidereal time every day, repeating to within 0.2–0.5 dB. Against that baseline, small losses are easy to spot. At Lucknow, all four S-band signals repeatedly dropped by 7–15 dB for several minutes while L5 stayed normal. NavIC's S-band sits just above the 2.4 GHz Wi-Fi/microwave band, so local radio interference is a likely cause.
See the interference watch →The equatorial ionisation anomaly lies right across India. In the afternoon, electron content reaches 40–60 TECU. Straight up, that is 6–10 m of extra range error on GPS L1 and 12–17 m on NavIC L5, and about twice that for low satellites. After sunset, plasma bubbles can make signals flicker. Dual-frequency receivers remove most of this error; single-frequency phones cannot.
See today's ionosphere →After sunset, bubbles of thin plasma rise over the magnetic equator and make satellite signals flicker. In the second half of October 2026 they appeared on 14 of 15 nights over Bengaluru, Colombo, Mahé and Bangkok, usually between 19:00 and 01:00 IST. Lucknow and Kanpur in the north saw none: the bubbles rarely reach that far from the equator. October is peak season; the next one is March–April.
See the night-by-night calendar →During the Kp 6 geomagnetic storm of 31 October to 1 November 2026, daytime electron content over northern India and Diego Garcia was 25–45% below its normal level for the time of day. That is a "negative storm phase". The next night, it rose to more than double its normal level at Mahé (Seychelles).
See "compared with normal" →At Lucknow, NavIC time and GPS time differ by a steady 28.5 ± 2.6 ns (including a constant receiver bias). The difference is stable to 3×10-12 over 5 minutes. Even with only three navigation satellites, NavIC still delivers accurate time to telecom networks, power grids and banks.
See the timing page →NVS-03 launched on 30 October 2026 and is raising its orbit from transfer orbit to geosynchronous. Once it starts broadcasting a NavIC signal, this site will detect it automatically and post an alert to the feed.
Track NVS-03 →Method details and sources are in docs/RESEARCH.md of the project source and on the About page. Independent analysis, not an ISRO statement.
What this site can and cannot see. Everything comes from public receivers run by universities and the International GNSS Service, not from ISRO. Only a few of them record NavIC, so coverage of India is uneven.
Good = within 500 km of a station (measured nearby). Approximate = 500–1,000 km (edge of a station's view). Not covered = estimates only. Distance is to the nearest station that records NavIC. The Sky page works for any place, because it is calculated from orbits. The other measurements are only as good as the nearest station.
Why GPS for the ionosphere? Measuring the ionosphere needs a satellite received on two frequencies. Most of these receivers record NavIC on one frequency only (L5); Lucknow is the only public station that also records NavIC's S-band. In addition, the few NavIC satellites stand still in the sky, so they sample the ionosphere at a handful of fixed points. GPS satellites move and cover much more area. The receivers are the same, and NavIC-based values are shown wherever they exist.
Everything shown here can be downloaded. Please credit "NavIC Monitor, from IGS data" and the original station operators.
Interactive documentation: /docs
NavIC (IRNSS) is India's own regional satellite navigation system. It covers India and about 1,500 km around it. The satellites broadcast on L5 (1176.45 MHz) and on the S-band (2492.028 MHz), which no other GNSS uses. The newer NVS satellites add L1 (1575.42 MHz). Each satellite carries a navigation payload with rubidium atomic clocks, a C-band ranging transponder and laser retro-reflectors.
Since 13 March 2026 only three satellites deliver navigation service, one short of the four needed for NavIC-only positioning. The atomic clocks of the first-generation satellites failed one after another. NVS-03, launched on 30 October 2026, is expected to restore the minimum of four.
Independent research project. Not affiliated with, or endorsed by, ISRO. Values are estimates. Do not use them for safety-of-life decisions.