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Defence & Security
Pradeep Kumar

05/06/21 09:00 AM IST

INS Sandhayak Decommissioned

In news

INS Sandhayak, the Indian Navy's oldest Hydrographic Survey Vessel was decommissioned at Naval Dockyard in Visakhapatnam after serving the nation for 40 glorious years 

Service
  • During her 40 years of illustrious service in the Indian Navy, INS Sandhayak undertook over 200 major hydrographic surveys in Western and Eastern coasts of the Indian peninsula, the Andaman Sea, and surveys in neighbouring countries including Sri Lanka, Myanmar and Bangladesh. 
  • The ship also took part in important operations like  Op Pawan in Sri Lanka, 1987, Op Rainbow for Humanitarian Assistance in the aftermath of the Tsunami in 2004 and the maiden Indo-US HADR Exercise Tiger-Triumph in 2019.
Hydrographic survey
  • Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth's surface and adjoining coastal areas. Hydrographic surveyors study these bodies of water to see what the "floor" looks like. 
  • By mapping out water depth, the shape of the seafloor and coastline, the location of possible obstructions and physical features of water bodies, hydrography helps to keep our maritime transportation system moving safely and efficiently.
  • Multibeam echo sounder beams sweep the seafloor as the ship passes over the survey area.
  • Multibeam echo sounder beams bounce off the seafloor and return to the ship where the depth is recorded.
Source: Indian Express, PIB

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