Sriharikota (Andhra Pradesh), Oct 30 (PTI) The 24-hour countdown for the launch of India's next-generation navigation satellite, NVS-03, has commenced and is progressing, ISRO said on. ISRO’s NVS-03 launch could restore NavIC’s functionality, upgrading indigenous clocks and improving regional navigation amid recent launch setbacks. The 24 hour countdown for late tonight's key GSLV-F18/NVS-03 NavIC mission commenced at 2351 hrs on Thursday night.