However, ISRO deferred the launch after it found that one of the telemetry transmitters in the IRNSS-1D was not working properly.
India has so far launched three regional navigational satellites as part of a constellation of seven satellites to provide accurate position information service to users across the country and the region, extending up to an area of 1,500 km.
Though the full system comprises nine satellites -- seven in orbit and two on the ground as stand-by -- the navigation services could be made operational with four satellites, ISRO officials said. Each satellite costs around 150 crore and the PSLV-XL version rocket costs around 130 crore. The seven rockets would involve an outlay of around 910 crore.
The entire IRNSS constellation of seven satellites is planned to be completed by 2015. The first satellite IRNSS-1A was launched in July 2013, the second IRNSS-1B in April 2014 and the third on October 16, 2014. Once the regional navigation system is in place, India need not be dependent on other platforms.