The Indian Regional Navigation Satellite System (IRNSS) is an autonomous regional satellite navigation system being developed by the Indian Space Research Organisation (ISRO) which would be under complete control of the Indian government.

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.

The IRNSS would provide two services, with the Standard Positioning Service open for civilian use, and the Restricted Service (an encrypted one) for authorised users (including the military).

IRNSS would have seven satellites, out of which four are already placed in orbit. The constellation of seven satellites is expected to operate from 2016 onwards.

source: http://en.wikipedia.org/wiki/Indian_Regional_Navigation_Satellite_System