Japanese submarine chaser Cha-246 (1944)

She was laid down on 30 August 1944 at the Ishinomaki shipyard of Yamanishi Shipbuilding Co., Ltd. (jp:ヤマニシ) and launched on 8 October 1944.[1][3][4] She was fitted with armaments at the Kure Naval Arsenal; completed and commissioned on 22 January 1945; and assigned to the Osaka Guard Force, First Fleet.[3] On 15 June 1945, she was assigned to the Sasebo Guard Force, Shimonoseki Defense Team, Seventh Fleet.[3] She survived the war.[3] On 30 December 1945, she was demobilized and assigned to mine-sweeping duties by the occupying forces.[3]

On 1 January 1948, she was assigned to the Japan Maritime Safety Agency as a minesweeper and designated MS-05 on 1 May 1948.[3] On 1 December 1951, she was renamed Yamabato (まばと) and served during the Korean War.[3] On 1 July 1954, she was transferred to the newly created Japan Maritime Self-Defense Force.[3] On 1 April 1956, she was designated Special Affairs Boat No.2 (MS-05) and on 31 March 1957, as Special Agent Boat No. 6 (YAS-06).[3] She was delisted on 1 June 1958.[3]