High Quality Content by WIKIPEDIA articles! HMSML Gleaner (H86) is the smallest commissioned vessel in the Royal Navy with a length of just under 15 meters and a ship`s company of just 8 (2 officers and 6 ratings). Commanded by Lieutenant Commander John Winn, she is currently based in Devonport, Plymouth. The ship prefix "HMSML" stands for Her Majesty`s Survey Motor Launch.