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Dilbar (yacht)
Dilbar is a 156-meter motor yacht built by German shipyard Lürssen and delivered in 2016, the largest motor yacht in the world by volume, though not the longest.
Dinghy
A dinghy, from the Hindi dingi, is a small open boat propelled by oars, motor, or sails, used for pleasure, racing, or ferrying people between ship and shore.
Disney Cruise Line
Disney Cruise Line is The Walt Disney Company's cruise business, operated through Magical Cruise Company Limited, which debuted its first ship in 1998 and is expanding to 13 family-oriented ships by 2031.
Disney Destiny
Disney Destiny is a cruise ship operated by Disney Cruise Line, the third Wish-class ship, themed around Disney, Pixar, and Marvel heroes and villains, entering service in November 2025.
Disney Dream
The Disney Dream is a cruise ship operated by Disney Cruise Line, built by Meyer Werft and delivered in 2010; it entered service in 2011 from Port Canaveral, Florida.
Disney Fantasy
Disney Fantasy is a cruise ship operated by Disney Cruise Line, the fourth ship in the fleet and second Dream-class vessel, delivered by Meyer Werft in 2012.
Disney Magic
Disney Magic is a cruise ship operated by Disney Cruise Line and the first vessel in its fleet, built by the Italian shipyard Fincantieri and placed in service in 1998.
Disney Treasure
The Disney Treasure is a Disney Cruise Line ship built in Germany and placed in service in December 2024, the second ship of the Wish class.
Displacement hull
A displacement hull is a boat or ship hull supported entirely by buoyancy, used in most commercial shipping and sailboats, and limited by wave-making resistance at hull speed.
Distress signal
A distress signal, also known as a distress call, is an internationally recognized means of calling for help, defined by COLREGS Annex IV and including "Mayday" and SOS.
Dive support vessel
A dive support vessel is a ship with a saturation diving system that places commercial divers at subsea work sites to build and repair offshore structures.
DNV (classification society)
DNV, formerly Det Norske Veritas and DNV GL from 2013 to 2021, is a Norwegian classification society setting technical rules for ships. It is the world's largest by market share.
Dock landing ship
A dock landing ship (LSD), or Landing Ships, Dock, is an amphibious warfare ship that floods a stern well deck so landing craft carrying troops and vehicles can motor ashore.
Docking basin
Docking basin: an open, usually artificial water area enclosed by dock gates or locks where vessels moor or dock alongside quays; also called wet dock or harbor (US), distinct from a dry dock.
Dolphin-class submarine
The Dolphin class (Hebrew: הצוללות מסדרת דולפין) is a series of diesel-electric submarines built by Howaldtswerke-Deutsche Werft in Kiel, Germany, for the Israeli Navy, largely German-financed, serving since 1999.
Double bottom
A double bottom is a ship hull built with two layers of bottom plating, the space between serving as tanks for ballast, fuel, or fresh water.
Double hull
A double hull is a ship hull made of two watertight steel layers separated by a space, mandated on oil tankers because oil spills require breaching both layers.
DP World
DP World, also known as Dubai Ports World (موانئ دبي العالمية), is a Dubai-based state-owned company that operates ports and terminals in over 69 countries.
Draft survey
A draft survey is a procedure that determines cargo weight loaded onto or discharged from a ship by measuring drafts and computing the change in displacement.
Drag chain
A drag chain, also called a chain drag, is a heavy pile of steel chain dragged along the seabed to stop a ship after its launch down a slipway.
Dragon boat
A dragon boat (赛龙舟) is a long paddled watercraft decorated with a dragon's head and tail, raced by crews of 10 to 20 paddlers, tied to China's Duanwu Festival.
Dragonfly (yacht)
Dragonfly is a range of folding sailing trimarans built by Quorning Boats in Skærbæk, Denmark, whose patented Swing Wing system folds the outer hulls in under a minute.
Dreadnought
A dreadnought is a battleship built on the pattern of HMS Dreadnought of 1906, armed entirely with large-caliber guns, making all earlier battleships, called pre-dreadnoughts, obsolete.
Drone carrier
A drone carrier, or drone mothership, is a warship designed to operate a substantial force of unmanned vehicles, chiefly UAVs, from dedicated, converted, or adapted ships.
Dry Combat Submersible
The Dry Combat Submersible (DCS) is a Lockheed Martin-built mini-submarine that carries US special operations forces in dry, one-atmosphere comfort, reaching initial operational capability in 2023.
Dry dock
A dry dock, also called a graving dock, is a basin from which water is pumped out so a ship's hull below the waterline can be repaired.
Dugout canoe
A dugout canoe is a boat made by hollowing out a single tree trunk, the oldest boat form known; the Pesse canoe from the Netherlands dates to about 8000 BC.
Dunkerque-class battleship
The Dunkerque class was a pair of French fast battleships of the 1930s, Dunkerque and Strasbourg, with eight 330 mm guns in two all-forward quadruple turrets.
Duwamish (fireboat)
The Duwamish is a retired Seattle Fire Department fireboat, launched in 1909 and in service about 75 years before her 1984 retirement, now a museum ship in Seattle.
Duyfken
The Duyfken, a Dutch East India Company vessel, became the first European ship known to sight and chart Australia, mapping Cape York in 1606 under Willem Janszoon.