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Recently, the Union Minister of Ports, Shipping and Waterways inaugurated the indigenous Differential Global Navigation Satellite System (DGNSS) ‘SAGAR SAMPARK.



  • It is an indigenous Differential Global Navigation Satellite System (DGNSS).
  • The Differential Global Navigation Satellite System is a terrestrial based enhancement system which corrects the errors and inaccuracies in the Global Navigation Satellite System (GNSS) allowing for more accurate positioning information.
  • It is now able to transmit corrections of GPS and GLONASS.
  • Significance
    • Sagar Sampark at six locations will assist the Director General of Lighthouses and Lightships (DGLL) to provide radio aids to ships for marine navigation.
    • The system will provide accurate information to the ships for safe navigation and will reduce the risk of collisions, groundings, and accidents in the port and harbour areas.
    • This will lead to the safe and efficient movement of vessels.
    • It will significantly improve the accuracy of GPS positioning and reduce errors caused by atmospheric inferences, satellite clock drift, and other factors.
    • The error correction accuracy has been improved from 5 to 10 meters to less than 5 meters for 100 Nautical Miles (NM) from Indian coastlines.


Q1) What is GLONASS?

GLONASS or Global Navigation Satellite System is the satellite navigation system developed by Russia that consists of 24 satellites, in three orbital planes, with eight satellites per plane. Russia started developing GLONASS in 1976 as an experimental military communications system. They launched the first GLONASS satellite in 1982 and the constellation became fully operational in 1995.

Source: Shri Sarbananda Sonowal inaugurates ‘SAGAR SAMPARK’ Differential Global Navigation Satellite System to Strengthen Maritime sector