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NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Able - Sugar - Easy

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 27 August 1941 by the Burger Boat Co., Boothbay Harbor, ME
  • Launched 25 July 1942
  • Completed 28 October 1942
  • Struck from the Naval Register 17 April 1946
  • Transferred to the War Shipping Administration in January 1947
  • Renamed Misinderan in 1947
  • Renamed Western Challenger in 1951
  • Acquired in 1958 by Nelson Brothers Fisheries, Ltd. of Vancouver, British Columbia, Canada
  • Acquired in 1980 by British Columbia Packers, Ltd. of Richmond, British Columbia
  • Acquired in 2004 by Jim Pattison Enterprises, Ltd. of Vancouver
  • Acquired in 2014 by Western Challenger, LLC
  • Fate unknown.


  • Displacement 320 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 6' 1"
  • Speed 13 kts.
  • Complement 33
  • Armament: One 3"/50 dual purpose gun mount, two 20mm mounts, two depth charge tracks, and two depth charge projectors
  • Propulsion: Two 800bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts
    Reengined in 1951 with two 560hp Union diesel engines and again in 2004 with two 850bhp diesel engines.

    Click on thumbnail
    for full size image
    Size Image Description Source
    USS YMS-111)
    YMS-110 & 111 421k Undated postcard
    Inscription on back:
    U.S.S. YMS 110 and U.S.S YMS 111

    These two Navy Minesweepers are underway sweeping in heavy seas during World War II, U.S.S. YMS 110 earned 165 stars for mines swept. Very few sweepers entered port with a clean attack. From painting by unknown artist
    R&J A Guam Production 88

    Jon A. Davis
    Western Challenger
    YMS-111 146k 22 January 2015
    Anacortes, Fidalgo Island, Washington
    Photo by Kyle Stubbs from
    Joe Radigan

    There is no DANFS history available for YMS-111
    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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