SHAR Sriharikota is getting ready to launch its first private sector-built navigation satellite today at 6.59 pm. The satellite will replace one of NAVIC’s seven satellites which is malfunctioning. NAVIC is a system of seven navigational satellites powering India’s own navigation system. The 1425 kg IRNSS – 1H satellite will lift off on the back of PSLV C-39, on its 41st flight. The Indian space agency has conducted 150 missions over the last three decades, staring with Aryabhatta in 1975.