Sandhayak-class survey vessel (2023)

	Sandhayak (J18) during sea trials
Class overview
Builders	Garden Reach Shipbuilders and Engineers
Operators	Indian Navy
Preceded by	Makar class
Planned	4
Building	4
Completed	3
Active	2
General characteristics
Type	Hydrographic survey ship
Displacement	3,300 tonnes (3,248 long tons)
Length	110 m (360 ft 11 in)
Beam	16 m (52 ft 6 in)
Speed	18 knots (33 km/h; 21 mph)
Range	6,500 nmi (12,000 km; 7,500 mi) at 14 knots (26 km/h; 16 mph) to 16 knots (30 km/h; 18 mph)
Boats & landing; craft carried	Survey Motor Boats (SMBs); Rigid Hull Inflatable Boats (RHIBs);
Complement	231
Sensors &; processing systems	Autonomous Underwater Vehicles (AUVs); Remote Operated Vehicles (ROVs); Multi Beam Echo Sounders;
Armament	CRN 91 naval gun
Aircraft carried	1 × HAL Dhruv helicopter
Aviation facilities	Helipad

The Sandhayak-class survey vessels are a series of four survey vessels being built by Garden Reach Shipbuilders and Engineers (GRSE), Kolkata for the Indian Navy. The first vessel was commissioned in 2021. The primary role of the vessels would be to conduct coastal and deep-water hydrographic survey of ports, navigational channels, Exclusive Economic Zones and collection of oceanographic data for defence. Their secondary role would be to perform search & rescue, ocean research and function as hospital ships for casualties.