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NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Easy - Charlie - Uncle

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 24 June 1941 by the Wheeler Ship Building Corp., Brooklyn, NY
  • Launched 30 April 1942
  • Completed 20 June 1942 and commissioned USS YMS-46
  • Struck from the Naval Register 10 June 1947
  • Transferred to the War Shipping Administration in April 1948
  • Registered in 1949 to S. S. Seafoods, Inc. of Tumacacori, AZ as the fishing boat Leonardo I out of San Francisco, CA
  • Sold in 1950 and operated under the Mexican flag
  • Fate unknown.


  • Displacement 270 t.
    1949 - 250 t.
  • Length 136'
    1949 - 125.5'
  • Beam 24' 6"
    1949 - 24.4'
  • Draft 8'
    1949 - 11.4'
  • Speed 15 kts.
  • Complement 32
    1949 - 12
  • 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
    YMS-46 102k Launching
    Photo from the October 1942 edition of Motor Boating magazine
    David Wright
    YMS-46 662k c. 1946
    Entering San Francisco Bay
    Robert Abelson

    There is no DANFS History currently available for YMS-46
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    This page created and maintained by Joseph M. Radigan & Michael Mohl

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