A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping.
A minehunter is a naval vessel that seeks, detects, and destroys individual naval mines. Minesweepers, on the other hand, clear mined areas as a whole, without prior detection of mines. A vessel that combines both of these roles is known as a mine countermeasures vessel (MCMV).
The AN/SQQ-32 minehunting sonar set (MSS) is a variable-depth mine-hunting sonar system originally developed by Raytheon and Thales Underwater Systems for the United States Navy. It includes two separate active sonar systems to detect and classify mine-like objects on the surface, in the volume, or on the bottom of the sea. The sonar systems are packaged in a single towed body tethered to the ship through a cable providing power and data transmission, with the cable length variable via an electric winch. A hole in the ship extending from the sonar maintenance room (SMR) to the hull allows movement of the towed body in different configurations for maintenance, stowage at sea, and minehunting operations. The towed body can be configured for minehunting by either locking to the bottom of the ship's hull for shallow water operations, or by extending and retracting the tow cable to allow for variable depth sonar (VDS) operations. VDS operations are necessary in deep water due to refraction of the sonar from the various temperature layers present in the ocean; with the sonar positioned in the same thermal layer as the suspected mines the error induced by refraction is minimized. The detect and classify sonar subsystems are independently monitored and controlled by two operators at independent panels working together to find and characterize underwater objects as mine or non-mine like objects.
The Huon-class minehunter coastal (MHC) ships are a group of minehunters built for the Royal Australian Navy (RAN). Following problems with the Bay-class minehunters, a request for tender was issued in 1993 for a class of six coastal minehunters under the project designation SEA 1555. The tender was awarded in 1994 to the partnership of Australian Defence Industries (ADI) and Intermarine SpA, which was offering a variant of the Italian Gaeta-class minehunter.
USS Raven (MHC-61), an Osprey-class coastal minehunter, was the third ship of the United States Navy to be named for the raven. The contract to build her was awarded to Intermarine USA in Savannah, Georgia on 31 March 1993 and her keel was laid down on 1 April 1995. She was launched on 28 September 1996, and commissioned on 5 September 1998.
A mine countermeasures vessel or MCMV is a type of naval ship designed for the location of and destruction of naval mines which combines the role of a minesweeper and minehunter in one hull. The term MCMV is also applied collectively to minehunters and minesweepers.
The Tripartite class is a class of minehunters developed from an agreement between the navies of Belgium, France and the Netherlands. A total of 35 ships were constructed for the three navies. The class was constructed in the 1980s–1990s in all three countries, using a mix of minehunting, electrical and propulsion systems from the three member nations. In France, where they are known as the Éridan class they are primarily used as minehunters, but have been used for minesweeping and ammunition transport in Belgium and the Netherlands, where the Tripartites are known as the Alkmaar class.
HMS Dittisham was one of 93 ships of the Ham-class of inshore minesweepers built for the British Royal Navy. Their names were all chosen from villages ending in -ham. The minesweeper was named after Dittisham in Devon.
USS Oriole (MHC-55) was an Osprey-class coastal minehunter of the United States Navy. She was built by Intermarine USA and launched in 1993 then commissioned in 1995. After only eleven years of service she was decommissioned in 2006 and sold to Taiwan. She now operates as ROCS Yung Jin (MHC-1310).
USS Black Hawk (MHC-58) was the eighth ship of Osprey-class coastal mine hunters.
HMAS Norman, named for the Norman River in Queensland, is the third Huon-class minehunter to serve in the Royal Australian Navy (RAN). Built by a joint partnership between Australian Defence Industries (ADI) and Intermarine SpA, Norman was constructed at ADI's Newcastle shipyard, and entered service in 2000.
Katanpää-class mine countermeasure vessels are a class of three multipurpose mine countermeasure vessels (MCMV) ordered by the Finnish Navy. The nearly 250 million euro contract was awarded to the Italian shipyard Intermarine S.p.A. in 2006. Initially, all three vessels were scheduled to be delivered by 2014 and the class was expected to achieve operational readiness by 2015, but there have been various delays and the last vessel was handed over to the Finnish Navy in November 2016.
HMAS Hawkesbury, named for the Hawkesbury River, is the second Huon-class minehunter to have been built for the Royal Australian Navy (RAN). Built by a joint partnership between Australian Defence Industries (ADI) and Intermarine SpA, Hawkesbury was constructed at ADI's Newcastle shipyard, and entered service in 2000.
Avenger-class mine countermeasures ships are a class of 14 ships constructed for the United States Navy from 1987 to 1994, designed to clear mines from vital waterways. The ships have the hull designator MCM.
The Lerici class is a class of minehunters constructed by Intermarine SpA and owned and operated by the Italian Navy. The class incorporates two subclasses: the first four ships are referred to specifically as the first series of the Lerici class, while eight more ships produced to a slightly modified design are known as "second series Lericis" or as the Gaeta class.
Intermarine is an Italian shipbuilding company, owned by the Rodriquez Cantieri Navali Group.
GSL Mine Counter-Measure Vessels are series of twelve naval ship that were jointly proposed to be built by Goa Shipyard Limited and a yet to be decided TOT partner for the Indian Navy.
HMS Aveley was a Ley-class inshore minehunter of the Royal Navy. Aveley was built by J. Samuel White at their Cowes, Isle of Wight shipyard, being launched in 1953 and completing the next year. She remained in Royal Navy service until 1982, spending several years laid up in reserve, and from 1963 to 1980 was used for training at Portsmouth. In 1983, the ship was sold to the Woolwich Sea Cadets and renamed TS Woolwich. Woolwich was scrapped from November 1986.
