India’s navigation satellite system suffers major setback: 1 of 4 operational IRNSS satellites fails India’s indigenous navigation satellite system—Navigation with Indian Constellation (NavIC)—has faced a significant challenge as one of its four operational satellites, IRNSS 1-F, reported a failure after 10 years of service. According to Indian Space Research Organisation (ISRO) officials, the satellite, launched in March 2016, ceased functioning due to a malfunction in its last remaining atomic clock. The failure marks another setback for the system, which relies on a minimum of four fully operational satellites to provide navigation services to the public and government agencies, including railways and the military. The IRNSS 1-F satellite, part of the NavIC constellation, was operating with only one of its three onboard atomic clocks until its last functional clock failed. ISRO stated that the satellite will continue to provide one-way broadcast messaging services in orbit, though its ability to support positioning, navigation, and timing (PNT) functions is now compromised. The failure brings the total number of failed satellites in the NavIC system to six, with atomic clock malfunctions cited as the primary cause for the initial failures. ISRO’s official statement noted that the IRNSS 1-F satellite completed its design mission life of 10 years on March 10, 2026, and that the atomic clock stopped functioning on March 13, 2026. The agency emphasized that the satellite will remain in orbit to support societal applications, though its role in PNT services is now limited. This incident highlights ongoing challenges in maintaining the reliability of the NavIC system, which was conceived to provide an independent navigation capability for India.#isro #indian_space_research_organisation #navic #irnss_1_f #atomic_clock
