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NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Queen - George - Oboe

YMS-423 served the Navies of the United States and South Korea

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 27 December 1943 by the Astoria Marine Construction Co., Astoria, OR
  • Launched 5 August 1944
  • Completed 25 October 1944
  • Struck from the Navy Register 25 February 1947
  • Transferred to the War Shipping Administration 26 December 1947
  • Sold to South Korea in 1948 and named ROKS Kaya San (YMS 511)
  • Sunk in 1949.


  • 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 mounts, and two depth charge projectors
  • 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
    No image of YMS-423 is available at this time

    There is no DANFS History currently available for YMS-423
    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 Auxiliary Motor Minesweeper (YMS) Photo Index

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    This page created and maintained by Joseph M. Radigan
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