Saryu-class

The Saryu class of offshore patrol vessels (OPV) was developed by Goa Shipyard Limited (GSL) for the Indian Navy as a successor to the Sukanya class. The design was derived from the Sankalp-class vessels previously produced for the Indian Coast Guard. Six ships were completed, with four delivered to the Indian Navy and two to the Sri Lanka Navy.

The class is designed for ocean surveillance, shipping lane monitoring, and the protection of offshore assets such as oil installations. The propulsion system consists of two Pielstick diesel engines driving Wärtsilä controllable-pitch propellers. Electronic and sensor systems include the Sperry Bridgemaster I-band navigation radar, the Sanket Mk III Electronic Support System, and the ELK 7036 communication intelligence system. Fire control is managed through the EON-51 electro-optical system. For electronic defense, the ships carry Kavach chaff launchers. The vessels are also equipped with a flight deck to support a single HAL Dhruv helicopter.

The Indian Navy commissioned the lead ship, INS Saryu, on 21 January 2013. Between 2013 and 2014, the navy commissioned three additional vessels: INS Sunayna, INS Sumedha, and INS Sumitra. These vessels have been utilized for anti-piracy operations, including an 80-day patrol in the Gulf of Aden by INS Sunayna. The Indian ships have also engaged in international maritime exercises, including SLINEX and PASSEX maneuvers. The Sri Lanka Navy commissioned its two vessels, SLNS Sayurala and SLNS Sindurala, in 2017 and 2018 respectively. All six vessels remain in active service.