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NavSource Online: Mine Warfare Vessel Photo Archive

ex-HMS J-847

BYMS-47 served the Navies of Great Britain and Finland.

BYMS-1 Class Motor Minesweeper:

  • Laid down 23 April 1942 as BYMS-47 by Gibbs Corp., Jacksonville, FL
  • Launched 8 August 1942
  • Completed 9 February 1943
  • Transferred to Great Britain 9 March 1943 and named HMS J-847
  • Renamed HMS BYMS-2047
  • Transferred to the State Department, Foreign Liquidation Commission 5 May 1948; sold to Finland and named Katanpää
  • Returned to U.S. custody 19 May 1948 (on paper only)
  • Fate unknown.


  • Displacement 270 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 8'
  • Speed 15 kts.
  • Complement 32
  • Armament: One 3"/50 dual purpose gun mount, two 20mm, and two depth charge projectiles
  • Propulsion: Two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    BYMS-2047 71k c. 1959
    Finnish Navy photo from the 1959/1960 edition of Jane's Fighting Ships
    Robert Hurst

    There is no DANFS history available for BYMS-47
    Additional Resources and Web Sites of Interest
    Naval Minewarfare Association
    Association of Minemen
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the British Motor Minesweeper (BYMS) Photo Index

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    This page created and maintained by Joseph M. Radigan
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