Ships built in Mandal, Norway

The Tjeld class was a class of twenty fast patrol boats designed and built for the Royal Norwegian Navy in the late 1950s. They were used as torpedo boats in Norway, where this type of vessel were called MTBs or motor torpedo boats (motortorpedobåt). They remained in service until the late 1970s, when they were placed in reserve; all were stricken by 1995.

The Greek Tjeld type patrol boats were a set of six fast patrol boats built to a Norwegian design and operated by the Hellenic Navy during the 1960s & early 1970s.

HNoMS Nasty was a fast attack craft of the Royal Norwegian Navy, built as a private venture by Westermoen Båtbyggeri of Mandal, Norway. Designed by Jan Herman Linge she was an experimental craft, of wooden hull construction, launched in 1958. Nasty served with the Royal Norwegian Navy and was the prototype for the navies Tjeld class patrol boats. Boats to Nasty's design were also built for the US and German navies. Nasty was stricken in 1967.

PTF-3 is United States Nasty-class patrol boat, now a museum ship at the DeLand Naval Air Station Museum, DeLand, Florida. PTF-3 is called Fast and Nasty. PTF-3 was built in 1962 by the Westermoen Båtbyggeri in Mandal, Norway. PTF-3 is small river gunboat built with an aluminium hull. The United States Navy used PTF-3 in the Vietnam War from 1962 to 1966 in the Brown-water navy. PTF-3 has a top speed of speed of 38 knots (70 km/h; 44 mph). She is a Nasty-class patrol boat (PTF-3 to PTF 22) at 80 ft 4 in (24.49 m) long. PTF Boats replace the wooden World War II PT boats. The PTF-3 was armed with two Oerlikon 20 mm cannon, .50 caliber Browning machine gun and 81mm mortar "Piggyback".

For other ship classes of the same name see Nasty-type patrol boat

The Nasty class of fast patrol boats were a set of 20 vessels built for the United States Navy to a Norwegian design and purchased in the 1960s for covert operations during the Vietnam War. Following the conflict they remained in service until the early 1980s.

MV Mariam is a Bolivian-flagged passenger ferry with a 228 gross tonnage (GT). Built in 1982 at Westermoen Hydrofoil shipyard, the ship is a catamaran 29.00 metres (95 ft 2 in) in length with a capacity of about 200 passengers. Built as Venture 84, the ship was in service with the French ferry operator Emeraude Lines from 1983 to 1996, serving a route between the Channel Islands and France. From 1996 to 2008, the ship was operated by Cypriot ferry operator Fergün Denizcilik as Fergün Express III.

MS Polarfront was a Norwegian weather ship located in the North Atlantic Ocean. It was the last remaining weather ship in the world, maintained by the Norwegian Meteorological Institute.

For other ship classes of the same name see Nasty-type patrol boat