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NAVIC (Hindi: नाविक) or NAVigation with Indian Constellation (Seafarer in Sanskrit) is the operational name of Indian Regional Navigation Satellite System or IRNSS^[1]^[2], 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. 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.^[3]^[4] However, the full system comprises nine satellites, including two on the ground as stand-by.^[5] The requirement of such a navigation system is 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.^[6] 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). Once the IRNSS is declared operational after checking the systems – space (satellites), ground (ground stations) and the user-end signal receivers, India will formally join a select group of nations owning their own Navigational Satellite system .^[7]

^ http://www.hindustantimes.com/india/a-gift-to-people-from-scientists-india-s-gps-named-navic/story-7klmnb7I7EHYNf6lnv09bK.html
^ "IRNSS-1G exemplifies 'Make in India', says PM". The Statesman. 28 April 2016. Retrieved 28 April 2016.
^ Cite error: The named reference isroweb was invoked but never defined (see the help page).
^ "IRNSS details".
^ Cite error: The named reference twostand was invoked but never defined (see the help page).
^ Srivastava, Ishan (5 April 2014). "How Kargil spurred India to design own GPS". The Times of India. Retrieved 9 December 2014.
^ "ISRO puts seventh and final IRNSS navigation satellite into orbit". Times of India.

[1] ttp://www.hindustantimes.com/india/a-gift-to-people-from-scientists-india-s-gps-named-navic/story-7klmnb7I7EHYNf6lnv09bK.html

[2] "IRNSS-1G exemplifies 'Make in India', says PM". The Statesman. 28 April 2016. Retrieved 28 April 2016.

[isroweb-3] Cite error: The named reference isroweb was invoked but never defined (see the help page).

[4] "IRNSS details".

[twostand-5] Cite error: The named reference twostand was invoked but never defined (see the help page).

[6] Srivastava, Ishan (5 April 2014). "How Kargil spurred India to design own GPS". The Times of India. Retrieved 9 December 2014.

[Firstpost-7] "ISRO puts seventh and final IRNSS navigation satellite into orbit". Times of India.

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