Published: 12 March 2026ISROScience & Technology
ISRO's NavIC Satellite IRNSS-1F Atomic Clock Stops Functioning
ISRO announced on March 13, 2026 that the atomic clock onboard the navigation satellite IRNSS-1F stopped functioning. Atomic clocks are essential for satellite navigation as they provide precise timing for calculating position data. Without a functioning clock, IRNSS-1F can no longer provide positioning data, though it will continue broadcast messaging services.
This failure drops NavIC (Navigation with Indian Constellation) below minimum operational capacity. NavIC was designed with seven satellites to provide position accuracy of better than 20 metres over India and the surrounding region. ISRO is accelerating replacement satellite plans while relying on remaining operational satellites.
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Frequently asked questions
What happened to ISRO's NavIC satellite IRNSS-1F atomic clock in March 2026?
**ISRO** announced that the **atomic clock** onboard the navigation satellite **IRNSS-1F** stopped functioning on **March 13, 2026**. Without a functioning clock, IRNSS-1F can no longer provide positioning data, affecting India's **NavIC** regional navigation system.
What is NavIC and how does the IRNSS-1F atomic clock failure affect it?
**NavIC (Navigation with Indian Constellation)** is India's regional satellite navigation system relying on a **constellation of 7 satellites**. The failure of **IRNSS-1F's atomic clock** on **March 13, 2026** reduces positioning accuracy as the satellite can no longer provide timing data.
Why are atomic clocks essential for satellite navigation systems like NavIC?
**Atomic clocks** provide extremely precise timing signals essential for calculating position data in navigation systems. In **NavIC's IRNSS-1F**, the atomic clock failure on **March 13, 2026** means the satellite cannot contribute accurate positioning to India's **7-satellite** navigation constellation.
How many satellites does India's NavIC constellation have and what is IRNSS-1F's role?
India's **NavIC** regional navigation system relies on a constellation of **7 satellites**. **IRNSS-1F** is one of them, and after its **atomic clock stopped functioning** on **March 13, 2026**, it can no longer contribute accurate positioning data to the constellation.
What is IRNSS-1F and what impact does its atomic clock failure have on Indian navigation?
**IRNSS-1F** is one of the **7 satellites** in India's **NavIC** regional navigation constellation. After its **atomic clock failed** on **March 13, 2026**, IRNSS-1F cannot provide positioning data, potentially affecting NavIC's accuracy for users across India and the region.
