What is INS Tushil?

About INS Tushil

• It is the first Krivak-III frigate to be acquired under Project 11356M.
• Project 11356M:
  • India in October, 2016 signed an Inter-Governmental Agreement (IGA) with Russia to purchase/construct four additional Admiral Grigorovich-class (Project 11356M) frigates through a partnership between Russian and Indian shipyards. 
  • Russia will supply two of the frigates (INS Tushil and INS Tamala), while the other two will be constructed in India.
  • The Talwar-class frigates, or Project 11356, are a class of stealth-guided missile frigates.
  • Under the IGA, Russia would provide technical assistance in setting up production of 11356 project frigates in India.
  • The construction of the ships is based on the Indian Navy’s specific requirements to meet the entire spectrum of naval warfare in all three dimensions of air, surface, and sub-surface.
• Features:
  • These ships feature "stealth technology" in terms of low radar and underwater noise signatures.
  • These ships are being equipped with major Indian-supplied equipment such as surface-to-surface missiles, sonar systems, surface surveillance radar, communication suites, and anti-submarine warfare systems, along with Russian surface-to-air missiles and gun mounts.
  • The frigates are designed to fight submarines and warships in brown and blue waters and repel air attacks both independently and within formations.
  • The displacement is 3620 tons, the length is 124.8 meters. The full speed is 30 knots, and the cruising range is 4850 miles.

Q1) What is a Sonar?

Sonar, which stands for "Sound Navigation and Ranging," is a technology that uses sound waves to detect, locate, and measure objects underwater. It is a versatile tool used in various applications, including navigation, communication, and underwater surveillance. Sonar systems operate on the principle of sending out sound waves and listening for their echoes to gather information about underwater environments and objects.

Source: INS Tushil begins sea trials from Russian naval base despite hurdles from Ukraine