HMS Gleaner (H86)
HMSML "Gleaner" (H86) was the smallest commissioned vessel in the Royal Navy, at the time of her decommissioning, with a length of just under 15 metres and a ship's company of just nine (two officers, one Senior Rating and six Junior Ratings). She was based in Devonport, Plymouth. The ship prefix "HMSML" stands for Her Majesty's Survey Motor Launch. "Gleaner" was withdrawn from service in February 2018. A replacement vessel, was commissioned in June 2018. History. "Gleaner" was the sixth ship to bear the name and was commissioned on 5 December 1983. With a top  speed of , "Gleaner" was designed to conduct inshore surveys along the south coast of England, though she has since surveyed all around the coastline of Great Britain and visited various ports in Europe. As an advanced survey vessel, "Gleaner" possessed an array of sophisticated technology, including multibeam and sidescan sonar to collect bathymetry and seabed texture data and compile an accurate and detailed picture of the seabed for later analysis. Her survey equipment also included an Applanix POS MV system for georeferencing and motion compensation, C-NAV GPS, Kongsberg EM2040 Multibeam Echo Sounder and Kongsberg EA400 Singlebeam Echo Sounder. "Gleaner  also has the distinction of being one of a handful of Royal Navy ships to have visited landlocked Switzerland, having travelled up the Rhine to Basel in 1988. Earlier visits were by HMS Flintham" and "Dittisham" in 1969, and HMS "Sabre" and "Cutlass" in 1979. She was also in attendance at the 2010 Portsmouth Navy Days. In 2016, "Gleaner" conducted an extensive survey of the Firth of Forth as part of the preparation work for the departure of in the spring of 2017. This work was necessary as the most recent survey was 60 years old. "Gleaner" entered Plymouth for  the last time on 31 January 2018 before being decommissioned. "Gleaner" was replaced by , which was commissioned in June 2018.