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flag India's NavIC system lost another satellite due to a failed atomic clock, leaving only three functional satellites and undermining its GPS alternative goal.

flag India’s NavIC satellite navigation system lost another operational satellite when the IRNSS-1F, launched in 2016, failed on March 13, 2026, due to a dead atomic clock, reducing functional PNT satellites to three—below the minimum of four needed for reliable coverage. flag The failure marks the end of its 10-year design life. flag Despite the setback, the satellite will continue providing one-way broadcast messaging. flag The system, which aims to reduce reliance on foreign GPS, has faced repeated issues, with six of 11 launched satellites failing, largely due to faulty imported atomic clocks. flag ISRO is working to restore full functionality with planned launches of three replacement satellites by end-2026, including those using indigenously developed rubidium clocks.

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