The Chamsuri class (Korean: 참수리급 고속정) (also known as the "Sea Dolphin" and "Wildcat" types)[1] are patrol boats originally constructed for and operated by the Republic of Korea Navy.

In Korea, the Chamsuri-class boats are being retired and replaced by Gumdoksuri-class patrol vessels.

The Chamsuri class were designed in the 1970s as the basis for South Korea's coastal defense against North Korean amphibious incursions.

The ships have two 50 kW diesel generator sets for electricity production.

[3] In 2002, a Chamsuri-class patrol boat, PKM 357 was sunk during the Battle of Yeongpyeong versus North Korean forces.

The design called for a ship 150 t (150 long tons) at full load with a length overall of 37 m (121 ft 5 in), capable of making 37 knots (69 km/h; 43 mph) with a range of 600 nmi (1,100 km; 690 mi) at 20 knots (37 km/h; 23 mph).

[12] A Chamsuri-class ship was one of three patrol vessels transferred by South Korea to the Naval Component of East Timor's F-FDTL in September 2011,[14] on the basis of a transfer agreement signed in Seoul the previous month.

[19] As part of the agreement, all armament was removed along with the identification friend or foe system.

[22][23] Chamsuris in Philippine Navy service are collectively referred to as the Tomas Batilo class, named after Filipino officers and soldiers who served with distinction during the Korean War.

[23] As of 1 March 2021, all ships of the class have been withdrawn from active service in the Philippine Navy.