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Australian general purpose frigate program
The Australian general purpose frigate program (SEA 3000) is a Royal Australian Navy acquisition of eleven Upgraded Mogami-class frigates from Japan's Mitsubishi Heavy Industries to replace the Anzac class.
Australian Maritime College
The Australian Maritime College (AMC) is Australia's national institute for maritime education, training, and research, a specialist institute of the University of Tasmania at Launceston.
Australian Maritime Safety Authority
The Australian Maritime Safety Authority (AMSA) is an Australian Commonwealth statutory authority, established in 1991, responsible for maritime safety, navigation aids, and national search and rescue services.
Automatic identification system
The automatic identification system (AIS) is a shipborne VHF radio system that broadcasts a vessel's identity, position, course, and speed to ships and shore stations.
Azipod
Azipod is an ABB electric azimuthing propulsion system, launched in 1990, with the motor in a submerged pod that rotates to drive and steer without a rudder.
Azzam (عزام) (2013 yacht)
Azzam (عزام), Arabic for "determination," is a 180.65-meter motor yacht delivered in 2013, the longest private yacht ever, built by Lürssen for Sheikh Khalifa of Abu Dhabi.
Baden-Württemberg-class frigate
The Baden-Württemberg class, also called Type F125, is a class of four frigates of the German Navy designed for long deployments, commissioned between 2019 and 2022.
Bahri (company)
Bahri, formally The National Shipping Company of Saudi Arabia (الشركة الوطنية السعودية للنقل البحري), is a Saudi shipping company founded by royal decree in 1978 and headquartered in Riyadh.
Balangay
The balangay, also spelled balanghai, is a precolonial Philippine wooden boat used for trade and settlement, with the oldest examples excavated at Butuan from 1976.
Balao-class submarine
The Balao class was a class of 120 United States Navy fleet submarines of World War II, built from 1943 with a stronger pressure hull for deeper diving.
Balaputradewa-class frigate
The Balaputradewa class, known as the Merah Putih frigates, is a two-ship class built for the Indonesian Navy by PT PAL Indonesia, with the lead ship launched in December 2025.
Balclutha (ship)
Balclutha is a three-masted, steel-hulled square-rigger built near Glasgow in 1886, which carried grain, lumber, and salmon around Cape Horn and is now a San Francisco museum ship.
Ballast
Ballast is weight carried by a ship or submarine to improve stability, immersion, and trim; it was once stone or sand, and is now usually seawater.
Ballast tank
A ballast tank is a compartment within a boat, ship, or submarine that holds water ballast to provide stability, control draft and trim, and keep hull stresses within safe limits.
Ballistic missile submarine
A ballistic missile submarine (SSBN) is a submarine designed to launch nuclear-armed ballistic missiles from undetected positions at sea; the first, USS George Washington, commissioned in 1959.
Balseros crisis
The balseros crisis was the 1994 exodus in which more than 35,000 Cubans set out in rafts for Florida, ending automatic US asylum for Cuban arrivals.
Baltic Dry Index
The Baltic Dry Index, also called the Baltic Freight Index, is a daily Baltic Exchange index of dry bulk shipping rates, widely watched as a gauge of world trade.
Baltic Sea anomaly
The Baltic Sea anomaly, also called the Baltic Sea UFO, is a roughly 60-meter circular feature on the Baltic seabed recorded by Swedish divers in 2011.
Bank effect
The bank effect is the set of hydrodynamic forces pushing a ship's bow away from, and drawing its stern toward, a nearby bank in restricted water.
Barbary slave trade
The Barbary slave trade, also known as slavery on the Barbary Coast, enslaved Europeans captured by North African corsairs from the sixteenth century until 1830.
Bareboat charter
A bareboat charter, also called a demise charter, is a lease of a ship giving the charterer full possession and control, without crew, as de facto owner.
Barge
A barge, also called a river barge, is a flat-bottomed cargo vessel without its own propulsion, moved by a tug or push boat along rivers and canals.
Barque
A barque, often spelled bark, is a sailing vessel of three or more masts, square-rigged on every mast except the aftermost, which carries fore-and-aft sails.
Bartolomeu Dias
Bartolomeu Dias, also written Bartholomew Diaz, was a Portuguese navigator who in 1487–1488 first rounded Africa's southern tip, proving a sea route to India existed.
Basra Gateway Terminal
Basra Gateway Terminal is a container terminal at Umm Qasr, Iraq's only deep-water port, operated by ICTSI under a 2014 contract with Iraq's General Company for Ports.
Batavia (1628 ship)
Batavia was a Dutch East India Company ship that wrecked on its maiden voyage off Western Australia in 1629, followed by a mutiny that killed over 100 survivors.
Bath Iron Works
Bath Iron Works is a shipyard on the Kennebec River in Bath, Maine, owned by General Dynamics since 1995 and one of two US yards building Arleigh Burke-class destroyers.
Batillus
Batillus was a French ultra-large crude carrier of about 553,662 tonnes deadweight, built in 1976 by Chantiers de l'Atlantique for Shell; laid up after less than eight years, she was scrapped at Kaohsiung, Taiwan, in 1985.
Battlecruiser
A battlecruiser is a warship combining battleship-scale armament with cruiser-level speed at the cost of thinner armor; Britain, Germany, and Japan built 27 between 1904 and 1922.
Battleship
A battleship is a large, heavily armored warship armed with major-caliber guns, the principal capital ship of the major navies until the last American ships retired in 1992.