The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration (NOAA) use a hull classification symbol to identify their ships by type and by individual ship within a type. The system is analogous to the pennant number system that the Royal Navy and other European and Commonwealth navies use.
Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and operation of marine vessels and structures. Naval architecture involves basic and applied research, design, development, design evaluation (classification) and calculations during all stages of the life of a marine vehicle. Preliminary design of the vessel, its detailed design, construction, trials, operation and maintenance, launching and dry-docking are the main activities involved. Ship design calculations are also required for ships being modified. Naval architecture also involves formulation of safety regulations and damage-control rules and the approval and certification of ship designs to meet statutory and non-statutory requirements.
Landing craft are small and medium seagoing watercraft, such as boats and barges, used to convey a landing force from the sea to the shore during an amphibious assault. The term excludes landing ships, which are larger. Production of landing craft peaked during World War II, with a significant number of different designs produced in large quantities by the United Kingdom and United States.
Seaspan ULC provides marine-related services to the Pacific Northwest. Within the Group are three shipyards, an intermodal ferry and car float business, and also a tug and barge transportation company that serves both domestic and international markets. Seaspan is part of the Washington Companies, owned by Dennis Washington. Seaspan is run by his son Kyle Washington, as Executive Chairman, who has become a Canadian citizen. Seaspan ULC was formerly known as Seaspan Marine Corporation, and prior to that Washington Marine Group.
Crowley, legally Crowley Maritime Corporation, is based in Jacksonville, Florida. Founded in 1892, Crowley is primarily a family- and employee-owned vessel management, owner, and supply chain logistics services company, providing services globally. As of July 2016, Crowley was ranked as the 13th largest private company in Florida, employing approximately 5,300 people worldwide with revenues of $2.2 billion. It provides its services using a fleet of more than 300 vessels, consisting of RO-RO vessels, LO-LO vessels, tankers, Articulated Tug-Barges (ATBs), tugs and barges. Crowley's land-based facilities and equipment include terminals, warehouses, tank farms, and specialized vehicles.
The Defoe Shipbuilding Company was a small ship builder established in 1905 in Bay City, Michigan, United States. It ceased to operate in 1976 after failing to renew its contracts with the United States Navy. The site of the former company is now being developed for business and housing on the bank of the Saginaw River.
The Damen Group is a Dutch defence, shipbuilding, and engineering conglomerate company based in Gorinchem, Netherlands.
Lobnitz & Company was a Scottish shipbuilding company located at Renfrew on the River Clyde, west of the Renfrew Ferry crossing and east of the confluence with the River Cart. The Lobnitz family lived at Chapeltoun House in East Ayrshire. The company built dredgers, floating docks, fishing boats, tugs and workboats.
Allied Shipbuilders Ltd is a privately held shipbuilding and ship repairing company established in Canada in 1948.
Lake Union Drydock Company is a full-service shipyard that specializes in vessel repair and conversions located in Seattle, Washington. Drydocking vessels up to 6000 tons, Lake Union Drydock Company repairs factory trawlers, fishing vessels, Coast Guard Cutters and buoy tenders, tugboats, research vessels, ferries, mega-yachts, barges, and houseboats.
Ferguson Marine Limited is a shipbuilding company whose yard, located in Port Glasgow on the Firth of Clyde in Scotland, was established in 1903. It is the last remaining shipbuilder on the lower Clyde and is currently the only builder of merchant ships on the river. For some years the company's mainstay has been Roll-on/roll-off ferries, primarily for Caledonian MacBrayne (CalMac), including a series of innovative hybrid diesel-electric/battery-powered vessels. Beset with difficulties since 2018 over their latest two CalMac ferries, Fergusons' largest ever vessel, the shipyard was nationalised in December 2019. It is now classified as an executive non-departmental public body of the Scottish Government.
USCGC Citrus (WAGL-300/WLB-300/WMEC-300) was a Cactus (A)-class seagoing buoy tender built in 1942 in Duluth, Minnesota, and now operated by the navy of the Dominican Republic.
USCGC Tupelo WAGL/WLB-303, was a Cactus (A) Class 180-foot buoy tender vessel built by Zenith Dredge Company of Duluth, Minnesota. Her keel was laid 15 August 1942, launched 28 November 1942 and commissioned on 30 August 1943. She was built as a WAGL and redesignated a WLB in 1965.
ST Cervia was built in 1946 as a seagoing tug for use as a fleet auxiliary by Alexandra Hall & Company Ltd of Aberdeen, Scotland. Today she is a floating Museum still undergoing restoration in Ramsgate, Kent.
Philip and Son was a shipbuilder in Kingswear, near Dartmouth, Devon, England. Operating from 1858 until the late 1990s, the company provided employment opportunities for nearly 141 years for many people of Dartmouth. It was Dartmouth's last industrial shipyard. A documentary film, Philip and Son, A Living Memory, presents the story of the industrial shipyard from its beginning to its eventual closure.
Henry Christoffersen is a shallow draft pusher tug built to operate on Canada's Mackenzie River. She was launched in 1973, and was the name ship of her class. She was designed by the Robert Allan Ltd. ship architects. She was built in Esquimalt, BC at a shipyard known as Burrard Yarrows.
HMS Hearty was a fishery protection vessel and survey ship of the British Royal Navy. Built by the Scottish shipbuilder W. B. Thompson as the tug Indra, the ship was launched in 1885 and purchased by the Royal Navy. Hearty was sold in 1920 for use as a salvage vessel. She was renamed Dalhousie in 1921, and was sold for scrap in 1930, being scrapped in 1935.
