1,577 articles
Parametric rolling
Parametric rolling is a self-reinforcing ship roll motion caused when waves periodically reduce transverse stability, occurring mostly in head and following seas; the 1998 APL China casualty made it a regulatory concern.
Passengers of the Titanic
The roughly 1,300 fare-paying passengers of the Titanic, sailing in three classes in April 1912, saw survival rates vary sharply by sex, age, and ticket class.
Patrol boat
A patrol boat is a small naval or coast guard vessel, typically 10 to 60 meters long, used for border protection, anti-smuggling, fisheries patrols, and rescue.
Patrol Boat, River
The Patrol Boat, River (PBR) was a small, fast fiberglass patrol craft built for the US Navy, the principal river patrol vessel in South Vietnam from 1966.
Patrol Craft Fast
The Patrol Craft Fast, or Swift boat, was a 50-foot aluminum patrol craft the US Navy used for coastal and riverine patrols during the Vietnam War.
Patrol torpedo boat PT-109
PT-109 was a US Navy motor torpedo boat rammed by a Japanese destroyer in the Solomon Islands in 1943 while commanded by John F. Kennedy.
Patrouilleurs Hauturiers
The Patrouilleurs Hauturiers (PH) are a class of ten offshore patrol vessels being built for the French Navy by Piriou, CMN, and Socarenam, with the first launched in 2026.
Pattugliatori Polivalenti d'Altura
The Pattugliatori Polivalenti d'Altura, also known as the Paolo Thaon di Revel class, are seven modular multipurpose offshore patrol vessels built by Fincantieri for the Italian Navy.
Pedro Álvares Cabral
Pedro Álvares Cabral (c. 1467–c. 1520) was a Portuguese nobleman and naval commander who commanded the second expedition to India and made the official Portuguese discovery of Brazil in 1500.
Pennsylvania-class battleship
The Pennsylvania class comprised two US Navy dreadnought battleships, USS Pennsylvania and USS Arizona, completed in 1916; Arizona was sunk at Pearl Harbor in 1941.
Pennsylvania-class cruiser
The Pennsylvania-class cruiser was a class of six large armored cruisers built for the United States Navy in the early 1900s, among the world's largest when completed.
Phil Harris (fisherman)
Phil Harris, also known as Captain Phil Harris, was an American crab fisherman who captained the Cornelia Marie on Deadliest Catch until his death in 2010.
Philadelphia Experiment
The Philadelphia Experiment, also called the Philadelphia Project, is an alleged secret United States Navy experiment said to have rendered the destroyer escort USS Eldridge invisible in 1943.
Philippine Merchant Marine Academy
The Philippine Merchant Marine Academy (PMMA) is the government maritime academy of the Philippines in San Narciso, Zambales, training merchant marine and Navy officers since 1820.
PIANC
PIANC, the World Association for Waterborne Transport Infrastructure, is a non-political, nonprofit association founded in Brussels in 1885 that publishes technical reports on ports and waterways.
Pier
A pier is a structure extending approximately perpendicular from the shore into water, providing berthing for ships; the word also names pleasure piers at seaside resorts.
Pinisi
Pinisi, also spelled phinisi, is the traditional two-masted, seven-sail rig of wooden vessels from South Sulawesi, Indonesia, built by Konjo shipwrights and inscribed by UNESCO in 2017.
Pioneering Spirit
Pioneering Spirit is the world's largest ship by gross tonnage, an Allseas catamaran built in South Korea in 2014 to install, remove, and lift entire offshore platforms.
Pipe-laying ship
A pipe-laying ship, also called a pipelay vessel, is a specialized marine vessel that welds and lowers steel pipeline onto the seabed as it advances along the route.
Piracy in the Seto Inland Sea
Piracy in the Seto Inland Sea, known in Japanese as kaizoku (海賊), was maritime power over Japan's Inland Sea from the tenth to the late sixteenth century.
Pirate code
The pirate code (pirate articles, chasse-partie) was a set of written articles pirate crews swore or signed, governing the ship, dividing plunder, and punishing offenses, from the 1678 buccaneer contracts onward.
Pirogue
A pirogue is a long, narrow boat, originally a dugout canoe hollowed from a single tree trunk, used in the Caribbean, the Americas, West Africa, and Oceania.
Pitch (ship motion)
Pitch is the rotational oscillation of a ship about its transverse axis, one of six degrees of freedom, governing seakeeping in head seas and slamming.
PLA Navy landing barges
PLA Navy landing barges, known informally as the Shuiqiao class, are Chinese jack-up barges that link with extendable bridges into a movable pier for landing heavy vehicles on beaches.
Planing (boat)
Planing is the mode in which a boat's weight is carried by hydrodynamic lift from its hull's motion rather than buoyancy, letting it exceed displacement speed limits.
Planing hull
A planing hull is a boat hull supported at speed by dynamic water lift on its flat or V-shaped bottom, unlike a displacement hull capped by hull speed.
Platform supply vessel
A platform supply vessel (PSV) is a ship purpose-built to carry cargo, equipment, and supplies between onshore bases and offshore oil and gas platforms, with an open deck aft and bulk tanks below.
PNS Ghazi
PNS Ghazi, formerly USS Diablo, was a Tench-class submarine of the Pakistan Navy, the first operated in South Asia, lost with all hands off Visakhapatnam in December 1971.
PNS Hangor (S131)
PNS Hangor (S131) was a Daphné-class submarine of the Pakistan Navy, in service from 1969 to 2006, best known for sinking the Indian frigate INS Khukri in 1971.
Polar Icebreaker Project
The Polar Icebreaker Project, also called the Polar Class Icebreaker Project, is a Canadian Coast Guard program launched in 2008 to build two heavy polar icebreakers for year-round Arctic operations.