The Indian Space Research Organisation (ISRO) has postponed the March 9 launch of IRNSS-1D, its fourth navigation satellite. It said a technical anomaly was noticed during combined electrical checks of the satellite and the launcher on Tuesday. The launch would be made after testing and clearing the anomaly.

A news release on Wednesday said, "During the integrated electrical checks of the launch vehicle along with the satellite after the closure of the heat shield on March 3, 2015, an anomaly was observed in one of the telemetry transmitters of the satellite. The launch of PSLV-C27 with IRNSS-1D has been postponed in order to resolve the technical anomaly through further test, simulation and analysis."

IRNSS-1D is the fourth of the Indian Regional Navigation Satellite System which will cover the country and regions around it. Three are already in orbit and three more are due to be launched to complete the constellation sometime next year.

ISRO has planned to place it in orbit on board the PSLV-C27 rocket from the Satish Dhawan Space Centre, Sriharikota.