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Propeller slipstream
The propeller slipstream is the accelerated, swirling column of fluid behind a ship's propeller or aircraft propeller, carrying energy that propulsive-efficiency devices try to recover.
Protocol of 2005 to the Convention for the Suppression of Unlawful Acts Against the Safety of Maritime Navigation
The Protocol of 2005 to the Convention for the Suppression of Unlawful Acts Against the Safety of Maritime Navigation is a multilateral treaty adopted in London in 2005.
PS General Slocum
The PS General Slocum was a wooden sidewheel passenger steamboat, built in Brooklyn in 1891, that burned in the East River on June 15, 1904, killing 1,021 people.
PS Waverley
PS Waverley is a British paddle steamer built on the Clyde in 1946 for the London and North Eastern Railway, the last seagoing passenger-carrying paddle steamer in the world.
PSA International
PSA International is a Singapore-headquartered global container terminal operator descended from the Port of Singapore Authority; it handled 105 million TEUs in 2025 across 45 countries.
PT boat
A PT boat was a small, fast, wooden motor torpedo boat used by the United States Navy in World War II, armed with torpedoes for harassing enemy forces.
PTF boat
A PTF boat, or Patrol Torpedo Fast, was a fast, shallow-draft US Navy combatant craft of the Vietnam War era, most closely identified with the Norwegian-designed Nasty class.
Puget Sound Naval Shipyard
Puget Sound Naval Shipyard, also known as the Bremerton Navy Yard, is a US Navy shipyard in Bremerton, Washington, established in 1891 and designated a shipyard in 1901.
Pump-jet
A pump-jet, also called a hydrojet, is a marine propulsion device that accelerates water through a ducted rotor and stator, widely fitted to submarines and torpedoes.
Purser
A purser, or ship's purser, is a shipboard officer responsible for provisions, stores, pay accounts, and administration; in modern passenger ships, the purser heads the administrative office.
Q-ship
The Q-ship, also known as a Q-boat, was a warship disguised as an unarmed merchant vessel, used by the British and French navies from 1914 to destroy submarines.
Quantum-class cruise ship
The Quantum class is a class of five cruise ships built by Meyer Werft for Royal Caribbean International from 2014, introducing firsts such as robotic bartenders and skydiving simulators.
Queen Anne (ship)
Queen Anne is a Cunard Line cruise ship delivered by Fincantieri on 19 April 2024, the 249th Cunard ship and its first new ship since 2010.
Queen Anne's Revenge
Queen Anne's Revenge was the flagship of the pirate Blackbeard, a French slave ship he captured off Martinique in 1717 and lost at Beaufort Inlet, North Carolina, in 1718.
Queen Elizabeth 2
Queen Elizabeth 2, known almost universally as the QE2, was a Cunard ocean liner that sailed from 1969 to 2008 and now serves as a floating hotel in Dubai.
Queen Elizabeth-class battleship
The Queen Elizabeth class was a class of five fast battleships built for the Royal Navy, the first battleships to burn oil fuel and carry 15-inch guns.
Queen Mary 2
Queen Mary 2 is a British ocean liner operated by Cunard Line, the largest passenger ship ever built when she entered service in January 2004, and the only liner in regular transatlantic service.
Queen of the Netherlands
Queen of the Netherlands is a Dutch trailing suction hopper dredger owned by Boskalis, built in 1998 and described at delivery as the world's largest.
Quota System (Royal Navy)
The Quota System was a 1795 British naval recruiting scheme requiring counties and seaports to raise fixed numbers of men for the Royal Navy at local expense.
Racon
A racon, from RAdar beaCON, is a receiver-transmitter beacon mounted on navigational marks such as buoys and lighthouses that, when triggered by a ship's radar, replies with a Morse-coded signal identifying the mark.
Raja Haji Fisabilillah-class patrol vessel
The Raja Haji Fisabilillah class, designated OPV 90M, is a class of Indonesian offshore patrol vessels built by PT Daya Radar Utama, with the lead ship launched in September 2024.
Range light
A range light, also called a leading light, is one of a pair of fixed navigation lights that guide vessels along a safe channel course when aligned.
Rating system of the Royal Navy
The rating system of the Royal Navy categorized British sailing warships into six rates by crew size and later by guns, from the early 17th century to the mid 19th.
Redoutable-class submarine (1967)
The Redoutable class was a class of six nuclear-powered ballistic missile submarines built for the French Navy between 1964 and 1985, the first generation of France's sea-based nuclear deterrent.
Reed boat
A reed boat is a watercraft built from bundles of buoyant reeds lashed with rope, independently developed where reeds grow, from Peru and Lake Titicaca to Iraq and the Nile.
Reefer ship
A reefer ship, or refrigerated cargo ship, carries perishable cargo such as fruit, meat, and fish in insulated holds cooled by the ship's own refrigeration plant.
Regent Craft
Regent Craft is an American startup founded in 2020 and headquartered in North Kingstown, Rhode Island, that develops all-electric Seagliders, including the 12-passenger Viceroy, a wing-in-ground-effect craft that foils then flies above the water.
Regional Container Lines
Regional Container Lines (宏海箱運集團), or RCL, is a Thai container shipping line that began as a Bangkok–Singapore feeder operator in 1979 and listed on the Stock Exchange of Thailand in 1988.
Renown-class battlecruiser
The Renown class was a pair of Royal Navy battlecruisers, HMS Renown and HMS Repulse, built during the First World War for very high speed and heavy 15-inch guns.
Republic of Pirates
The Republic of Pirates was a pirate haven based at Nassau in the Bahamas, home to Blackbeard and other captains until the British reconquest of 1718.