Some important facts about IRNSS-Indian Regional Navigation Satellite System :
1.The project is called Indian Regional Navigation Satellite System or IRNSS with an operational name of NAVIC
2. As part of the project, ISRO opened a new satellite navigation center within the campus of ISRO Deep Space Network
3. It is an indigenously developed Navigation Satellite System that is used to provide accurate real-time positioning and timing services over India and region extending to 1500 km around India.
4. The fully deployed IRNSS system consists of 3 satellites in GEO orbit and 4 satellites in GSO orbit, approximately 36,000 km altitude above earth surface.
5. The complete full system comprises of nine satellites, including two on the ground as stand-by.
6. The requirement of such a navigation system was driven because access to foreign government-controlled global navigation satellite systems is not guaranteed in hostile situations, as happened to the Indian military depending on American GPS during the Kargil War in which USA refused to give location of pakistani troops.
7. The IRNSS would provide two services, with the Standard Positioning Service open for civilian use, and the Restricted Service (an encrypted one) for authorized users (including the military)
8. Once the IRNSS is declared operational after checking the systems , India will formally join a select group of nations owing their own Navigational Satellite system
9. The IRNSS constellation of seven satellites are in orbit and is expected to operate from June 2016 onwards.
10. The total cost of the project is expected to be ₹1420 crore (US$211 million), with the cost of the ground segment being ₹300 crore (US$45 million).