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Danlayer

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Ship for marking areas swept for mines
HMS Sir Galahad, aRound Table-class trawler displacing 440 long tons, was converted to a danlayer in 1944 and used to support theNormandy landings

Adanlayer was a type of vessel assigned tominesweeping flotillas during and immediately afterWorld War II. They were usually smalltrawlers, fitted for the purpose of laying dans. Adan is a markerbuoy which consists of a long pole moored to the seabed and fitted to float vertically, usually with a coded flag at the top.

Dan laying was an important part of minesweeping, and boats were fitted specifically for this purpose. The task of a danlayer was to follow the minesweepers as they worked an area, and lay the dans which defined the area swept and made it obvious where the clear channels were. This would also help the minesweepers cover areas accurately without gaps and unnecessary overlaps.[1] A danlayer worked with a minesweeper flotilla when large areas of sea were to be swept.

List of danlayers

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Germany

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Since Germany had been an exponent of mine warfare since the 1920s, it was natural that theKriegsmarine used a number of danlayers duringWorld War II. Danlayers of the Kriegsmarine included the following vessels:

  • The 800-ton, 176-footB 206 - This vessel was ceded to France in 1946 and outfitted as the surveying vesselIngénieur Hydrographe Nicolas
  • The 120-ton, 82-footB 253, B 254, B 261, B 262, B 264, B 273 andB 275 - These were ceded to France in 1946 and renamedRachgoun, Treberon, Tourteau, Cassidaigne, Les Madeleines, Habibas andCrabe, respectively.Tourteau andCrabe became surveying tenders, while the others were employed as small harbor transports for naval personnel.
  • The 600-ton, 180-footB 281 (formerly the patrol trawlerV 204, originally namedZieten) - This vessel was ceded to France in 1946 and renamedAstrolabe as a surveying tender.
  • The 500-ton, 137-footB 282 andB 284 (formerly the whalersTreff. 6 andTraff. 2), respectively) - Both were ceded to France in 1946 and renamedEstafette andSentinelle as surveying tenders.

United Kingdom

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Danlayers employed by theRoyal Navy during the extensive mine clearance operations following World War II included the followingIsles-class trawlers.

  • Hellisay (T391)
  • Hermetray (T392)
  • Imersay (J422)
  • Orsay (J450)
  • Ronay (J429)
  • Sandray (J424)
  • Scaravay (J425)
  • Sheppey (T292)
  • Shillay (J426)
  • Sursay (J427)
  • Tahay (J452)
  • Tocogay (J451)
  • Trodday (J431)
  • Vaceasay (J432)
  • Vallay (J434)
  • Wiay (J441)

TwoRound Table-class trawlers,Sir Lanceleot (T228) andSir Galahad (T226) were converted fromminesweepers to danlayers prior to theNormandy landings.

In 1944, prior to the Allied invasion of Normandy, the Admiralty-type Motor Mine Sweepers Nos. 141, 142, 238, 239, 240, and 241 were converted to danlayers and renamed HMSBurfin, HMSCottel, HMSFichot, HMSJude, HMSQuirpon, HMSSt. Barbe. All were twin-screw, wooden, 105-foot, coastal-minesweeping sloops that were financed by Steers Ltd. of St. John's, Newfoundland and built by Henry Stone in his shipyard at Monroe, Trinity Bay, Newfoundland, Canada between 1941 and 1943.

New Zealand

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Danlayers employed by theRoyal New Zealand Navy during World War II

Notes

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  1. ^McDougall RJ,New Zealand Naval Vessels, p. 55. Wellington, NZ: Government Printing Office, 1989.ISBN 978-0-477-01399-4

References

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  • Francis E. McMurtrie and Raymond V.B. Blackman (eds.),Jane's Fighting Ships 1949–50, pp. 63, 193, 194. New York: The McGraw-Hill Book Company, Inc., 1949.
  • H.T. Lenton and J.J. Colledge,Warships of World War II, pp. 534 & 538, London, UK: Ian Allan Ltd., 1964.
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