Please report any broken links or trouble you might come across to the Webmaster. Please take a moment to let us know so that we can correct any problems and make your visit as enjoyable and as informative as possible.

NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Able - Uncle - Item

YMS-20 served the Navies of the United States and France.

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 27 June 1941 as YMS-20 by the Greenport Basin and Construction Co., Long Island, NY
  • Launched, 1 November 1941
  • Completed, 18 April 1942
  • Transferred to France 20 October 1944 as Gentiane (D 327)
  • Sold to France, 21 March 1949
  • Struck from the Navy Register 28 April 1949
  • Reclassified D-08 and M-648
  • Decommissioned 11 August 1960
  • 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, two dcp
    Propulsion: Two 800bhp 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
    USS YMS-20
    YMS-20 100k Photo courtesy of Leonard R. Bertolino LT,USNR-DE Bill Gonyo
    Gentiane (D 327)
    YMS-20 71k Gentiane underway with a double Oropesa sweep streamed Robert Hurst
    YMS-20 79k 7 April 1946 Joe Radigan

    There is no DANFS history available for YMS-20
    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

    Problems and site related matters, E-mail Webmaster

    This page created and maintained by Joseph M. Radigan
    All pages copyright NavSource Naval History