Glossary

Maritime glossary, terms beginning with D (page 8)

All maritime glossary terms that begin with the letter D, drawn from every subject section. 2401 entries.

Showing 250 of 2401 terms (page 8 of 10).

Dongkuk Steel X92. Marine Steel Suppliers and Shipbuilding Plate: South Korean steel producer with plate mill operations in Incheon and Pohang.
Donitz Wolfpack F1. Maritime History: Coordinated U-boat group tactics employed in the Battle of the Atlantic.
Donjon Cape May X175. Port Engineering, Dredging, Breakwaters, and Quays: Donjon Marine yard in Cape May, New Jersey, that supports East Coast dredging and marine construction operations.
Donjon Marine X13. Marine Salvage and Wreck Removal: US east coast salvage contractor with OPA 90 OSRO standing.
Donjon Marine Co X167. Major Salvage Companies, Wreck Removals, and Equipment: US salvage and marine construction company founded in 1964 by John A. Witte, headquartered in Newark, New Jersey.
Donjon Smit JV X60. Marine Salvage and Wreck Removal: Joint venture between Donjon Marine and Smit Salvage providing US OPA 90 salvage response services.
Donjon-Smit X126. Marine Oil Spill Response and OPRC Regimes: Joint venture of Donjon Marine and Smit Salvage holding the largest US OPA 90 OSRO and salvage approval network.
Donjon-SMIT (T&T Salvage) X99. Marine Salvage Awards and SCOPIC: Joint venture branded as T&T Salvage for US OPA-90 salvage response services.
Donjon-SMIT LLC X141. Marine Salvage Industry and Wreck Removal Contractors: Joint venture providing OPA-90 compliance services to roughly 8,000 vessels visiting US ports.
Donkey Boiler X63. Marine Auxiliary Machinery and Pumps: Historical term for an auxiliary boiler supplying steam to deck machinery at port.
Donoghue v Stevenson [1932] AC 562 X143. Landmark Maritime Law Cases and Doctrines: House of Lords foundation of the modern tort of negligence.
Donsoe Shipping Meet X119. Maritime Conferences, Trade Shows and Awards: Biennial shipowner and broker gathering on Donso Island, Sweden, founded 2002.
Door X6. Container, Intermodal and Trade Codes: End of a container with the swinging doors; "right door" and "left door" referenced in damage reports.
Door End X83. ISO Container Manufacturing and Leasing: End of a dry freight container where the two doors are hinged.
Door Gasket X83. ISO Container Manufacturing and Leasing: Rubber gasket between container door and door header providing weather seal.
Door Lock Bar X83. ISO Container Manufacturing and Leasing: Vertical bar on each door locked top and bottom into corner castings.
Door Stiffener X83. ISO Container Manufacturing and Leasing: Horizontal pressing on the container door panel providing stiffness against deflection.
Door switch X19. Engine Room Watchkeeping and UMS Operations: ECR door contact integrating with the dead man alarm system.
Door-step ferry X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: Informal term for short cable or chain ferries spanning narrow inland reaches.
Door-to-door X6. Container, Intermodal and Trade Codes: Through-transport service from shipper's premises to consignee's premises.
Door-to-port X6. Container, Intermodal and Trade Codes: Through service ending at the discharge port.
Doors (Trawl) X87. Fishing Vessels and Fisheries Management: Otter boards that shear outward to spread the trawl mouth horizontally.
Doorstep delivery C3. Logistics, freight forwarding and multimodal trade: Door delivery of containerised cargo.
Doosan Babcock X57. Ocean Energy Beyond Wind: UK engineering company involved in CCS capture and offshore renewable engineering studies.
Doosan Engine X90. Marine Engine Specific Model Enumeration: Korean licensed builder of MAN B&W two-stroke engines, renamed KSE in 2019 after sale to HD Hyundai.
Doosan HEMM X107. Maritime Cybersecurity and OT Security: Engine monitoring and management system associated with Doosan Engine marine two stroke installations.
Doosan Vina X46. Container Terminal Operations: A Vietnamese heavy industries plant established by Doosan Heavy Industries, manufacturing port cranes, boilers, and modules.
DOP pump X124. Dredging Industry and Reclamation Contractors: Damen-design submersible dredge pump, the DOP150 to DOP350 range covering 150 to 350 mm discharge.
Doppler Bubble Detection X82. Saturation Diving and Offshore Diving Operations: Ultrasonic technique for monitoring venous gas emboli post-dive.
Doppler current meter X15. Ports, Terminals and Stevedoring: hydrographic device used in pilot PPUs.
Doppler log X16. Nautical Science, Navigation and COLREGs: Speed log using Doppler shift of reflected acoustic signals.
Doppler Processing X80. Maritime Search and Rescue Coordination: LEOSAR technique used to locate 406 MHz beacons via satellite passage.
Doppler Scatterometer D5. Coastal processes, sea-level, cryosphere and ocean observation science: Sensor like WaCM measuring surface currents.
Doppler shift X10. Marine Biology, Fisheries and Oceanography: Frequency change of sound due to relative motion; used by ADCPs to measure current speed.
Doppler Sonar (Fisheries) X87. Fishing Vessels and Fisheries Management: Hull mounted instrument used to measure water flow during fishing operations.
Doppler Speed Log X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Hull-mounted log measuring vessel speed through water and over ground using acoustic Doppler shift.
Doppler velocity log X11. Naval Vessels, Warship Systems and Naval Architecture: Acoustic sensor measuring ship's speed over ground.
Dorian LPG X56. LNG/LPG Carriers and IGC Code: New York and Oslo-listed VLGC owner and operator headquartered in Stamford, Connecticut.
Doric Shipbrokers X71. Shipbrokers and Brokerage Firms: Greek dry bulk shipbroking firm headquartered in Athens.
Doris Miller (USS) CVN-81 X106. Naval Surface Combatants: Fourth Gerald R. Ford-class aircraft carrier under construction at Newport News Shipbuilding.
Dornier 228 X130. National Coast Guards and Cutter Fleets: Twin-turboprop maritime patrol aircraft operated by Indian Coast Guard, German BPOL See and Netherlands Coast Guard.
Dorries Yachts X125. Superyacht Industry, Builders and Brokers: Bremerhaven, Germany conversion specialist.
Dortmund-Ems Canal X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The 269 km German canal opened 1899 connecting the Ruhr industrial area with the North Sea at Emden via Munster.
DoS X22. Piracy, Maritime Security and Armed Protection: Declaration of Security under ISPS Code Part A Section 5.
Dosan Ahn Changho-class X91. Submarines and Submarine Cable Systems: Republic of Korea Navy KSS-III submarine class with vertical launch capability.
Dosing Pump X69. EGCS Scrubbers, SCR and Marine Air Emissions: Metering pump delivering caustic or urea at a controlled rate.
DoT NOAA X73. Marine Hydrography, Charting and ENC: The United States Department of Commerce parent agency of NOAA Office of Coast Survey.
DOT-39 Cylinder X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: A non-refillable U.S. cylinder design; not a UN spec packaging, generally unacceptable for international IMDG shipments without specific authorisation.
DOT-E X75. IMDG Code, Classes, Packing and Segregation: Old US Department of Transportation Exemption number, replaced by Special Permit DOT-SP.
DOT-SP X75. IMDG Code, Classes, Packing and Segregation: US Special Permit allowing alternative compliance, accepted under IMDG via mutual recognition where applicable.
Douane X130. National Coast Guards and Cutter Fleets: French Customs Surveillance branch (Douane Garde-Cotes), operates Patrouilleur Garde-Cotes (DF-PGC) vessels under Direction Generale des Douanes.
Double Acting Tanker X133. Polar Research Vessels and Polar Code Regimes: DAT concept proven by Norilsk Nickel Arc7 cargo ships built 2006-2009 by Aker Yards.
Double banking X15. Ports, Terminals and Stevedoring: two vessels moored alongside each other at one berth.
Double Bitt X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Two parallel vertical bitts on a common base around which a line is figured-of-eight, the standard mooring fitting on merchant ships.
Double Bottom (Reg 19 Annex I) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The space between the inner bottom and the outer hull required on oil tankers of 5,000 DWT and above ordered on or after 6 July 1993.
Double bottom block X58. Shipbuilding Yards and Construction: Bottom hull section comprising inner bottom, floors, girders, and outer shell.
Double Bottom Caustic Tank X69. EGCS Scrubbers, SCR and Marine Air Emissions: Structural tank arrangement carrying NaOH below the lower deck.
Double Bottom Height Rule X54. Naval Architecture Software and IACS Rules: SOLAS regulation defining minimum double bottom height aligned with IACS UR S17.
Double Bottom Inerting X118. Ship Recycling Yards, Beaches and Regulation: Pre-arrival inerting of fuel oil double bottoms to suppress hydrocarbon vapors, prerequisite to gas-free certification.
Double Bottom Inspection X5. Marine Surveying and Inspection: Close-up survey of inner bottom and bottom shell structure within DB tanks.
Double Counting Bonus X112. IMO GHG Strategy, CII, EEXI and EU Maritime Regulation: Multiplier of 2 applied to RFNBOs under FuelEU Maritime from 2025 to 2033 to incentivize their uptake.
Double cycling X15. Ports, Terminals and Stevedoring: STS strategy alternating load and discharge moves to cut idle hoists.
Double Drop Trailer X104. Project Cargo Forwarders and Heavy Transport: Trailer with a low center section providing extra vertical clearance for tall units.
Double Drum Winch X79. Tugs and Towage Industry: Towing winch with two independently controlled drums permitting simultaneous bow and stern operations.
Double Eagle X77. Naval Mine Warfare and Mine Countermeasures: A Saab family of tethered and semi-autonomous mine identification and disposal vehicles used by several European navies.
Double Eagle Mk II X77. Naval Mine Warfare and Mine Countermeasures: An improved variant of the Saab Double Eagle ROV with enhanced sensors and propulsion.
Double Eagle Mk III X77. Naval Mine Warfare and Mine Countermeasures: A further development of the Saab Double Eagle, including the Sarov mine disposal variant.
Double hull X11. Naval Vessels, Warship Systems and Naval Architecture: Submarine construction with separate pressure and outer hulls.
Double hull block X58. Shipbuilding Yards and Construction: Side hull block on a tanker incorporating inner and outer shells with stiffened web frames.
Double Hull Inspection X5. Marine Surveying and Inspection: Close-up survey of side ballast tanks and inner hull on double-hull tankers.
Double Hull Tanker X54. Naval Architecture Software and IACS Rules: Oil tanker configuration mandated by MARPOL Annex I and addressed by IACS CSR-OT.
Double Hull Tankers (Reg 19) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The Annex I structural standard requiring double sides and double bottom protection of cargo tanks for oil tankers of 600 DWT and above delivered on or after 6 July 1996.
Double Insurance X53. Marine Insurance, P&I and Hull Clauses: The situation, addressed in Section 32 of the Marine Insurance Act 1906, in which the same risk is insured by two or more policies exceeding the insurable value.
Double manning X32. Marine Pilotage and Pilot Operations: Pilotage with two pilots aboard, sometimes mandated for very large ships or long transits.
Double Occupancy X164. Cruise Industry, Brands, Ship Classes, and Terminals: The standard rate basis used in cruise pricing, assuming two passengers per stateroom.
Double pilot X32. Marine Pilotage and Pilot Operations: Charge for two pilots assigned to a single vessel.
Double Rod Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Container lashing using two rods per fitting.
Double Side X93. IBC Code and Chemical Tanker Operations: Hull arrangement with an inner skin separated from the shell plating, required for Type 1 and Type 2 ships under Chapter 2.
Double Trapdoor X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Combination arrangement using a side door in the ship's hull together with a pilot ladder rigged through the opening.
Double up X3. Ship Handling, Seamanship and Deck Vocabulary: Run a second mooring line of each kind.
Double-Acting Pump X63. Marine Auxiliary Machinery and Pumps: Reciprocating pump that delivers fluid on both forward and return strokes.
Double-acting tanker (DAT) X27. Polar Code, Ice Navigation and Polar Operations: Tanker with DAS design used in Russian Arctic crude oil export from Varandey.
Double-bottom B2. Marine Engineering: Structural arrangement providing tanks below cargo holds.
Double-bottom requirements X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: SOLAS II-1/9 sets minimum double-bottom extent for passenger and cargo ships of 500 GT and over.
Double-Bottom Tank X63. Marine Auxiliary Machinery and Pumps: Hull tank used for fuel, ballast, fresh water, or sewage storage below the inner bottom plating.
Double-deck gangway X24. Cruise, Passenger Ship and Ferry Operations: Cruise terminal passenger boarding bridge serving two passenger decks simultaneously.
Double-ended ferry X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: A ferry with wheelhouses and propulsion at both ends, allowing service without turning, common on BC Ferries, Washington State, and Norwegian routes.
Double-hatting X152. Maritime Arbitration and Dispute Resolution: Practice of acting both as arbitrator and counsel in different but related matters, scrutinized under IBA Guidelines on Conflicts of Interest.
Double-Hull Tank Barge X103. US Inland Waterway Towing and Barge: An inland tank barge with a void or ballast space between the cargo tanks and the outer shell, required for petroleum service since the OPA 90 phase-out completed in 2015.
Double-Joint X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Practice of welding two 12 m pipe joints into a 24 m double joint to increase laying speed on S-lay vessels.
Double-side skin (bulk carriers) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: SOLAS XII/6.2 (MSC.170(79)) requires double-side construction for new bulk carriers of 150 m and upwards contracted on or after 1 July 2006.
Double-side skin space X45. Marine Paints, Coatings and Antifouling: Cargo hold side void in single-side skin bulk carriers retrofitted with double-side construction, included in PSPC scope.
Double-Stack X46. Container Terminal Operations: A North American intermodal rail configuration carrying two stacked containers per well car.
Double-stack rail X15. Ports, Terminals and Stevedoring: intermodal rail with containers stacked two high.
Double-Stage Evaporator X63. Marine Auxiliary Machinery and Pumps: Fresh water generator using two effects to recover more distillate per unit heat input.
Double-Walled Piping X140. Ammonia as Marine Fuel and Hydrogen Shipping: Mandatory configuration under IGF Code for ammonia fuel supply lines, with inerted annulus monitoring.
Doublet (potential flow) B1. Naval Architecture: Singularity used in panel-method hull representation.
Doubling X3. Ship Handling, Seamanship and Deck Vocabulary: Reinforcing piece of timber or plate.
Doubling Check X66. Port State Control and Regional MOUs: Action by PSC officer to verify that the same deficiency was not previously rectified at the prior port.
Douglas X35. Yacht and Superyacht Industry: Isle of Man capital and seat of the Isle of Man Ship Registry.
Douglas Mawson X97. Polar Expedition Cruise and IAATO Operations: Aurora Expeditions expedition ship delivered in 2025, a 154 PAX X-Bow vessel named after the Australian Antarctic explorer.
Douglas protractor X16. Nautical Science, Navigation and COLREGs: Square transparent plotting protractor.
Douglas Sea State Scale F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Sea-state scale developed by Sir Henry Percy Douglas in 1917.
Dover X85. Ferries, Ro-Pax Operators and Routes: English Channel port hosting P&O Ferries, DFDS, and Irish Ferries cross-Channel services to Calais and Dunkirk.
Dover Patrol X39. Pre-1900 Maritime History: Royal Navy command guarding the Dover Strait, formally constituted in 1914 but with antecedents in earlier Channel guard.
Dover Sole (Frozen) X120. Marine Catering, Provisions and Ship Chandlers: Premium provisioning item, IMPA 551104 series frozen fish.
Dover Sole (Solea solea) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Premium flatfish targeted by Belgian, Dutch, French and UK beam trawlers in the North Sea and Bay of Biscay.
Dover Strait X32. Marine Pilotage and Pilot Operations: English Channel narrows where deep-sea pilotage and TSS pilotage practices apply.
Dover Strait Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Independent deep-sea pilot offering routing advice in the world's busiest international strait, although pilotage is not compulsory there.
Dover-Calais HSC X132. High-Speed Craft, Hydrofoils and Ferry Operators: Historic SeaCat and Hoverspeed Great Britain catamaran services, discontinued in 2005 when Hoverspeed closed.
Dovetail X6. Container, Intermodal and Trade Codes: Triangular fitting on flatracks or tank frames used to secure on rail wagons.
Dovetail Foundation X169. Container Terminal Cranes, Yard Equipment, and Lashing: Welded socket on the ship hatch cover or deck that receives a twistlock or lashing-rod base, also called a deck socket.
Dow Chemical X135. Chemical Tanker Operators and IBC Code Cargoes: Major US chemical shipper, a foundation customer of Stolt-Nielsen and Odfjell COA programs since the 1960s.
Dow Jones Risk & Compliance X29. Ship Sale and Purchase, Management Contracts and Valuation: Sanctions and KYC screening database.
Down by the head X3. Ship Handling, Seamanship and Deck Vocabulary: Trimmed more deeply forward than aft.
Down by the stern X3. Ship Handling, Seamanship and Deck Vocabulary: Trimmed more deeply aft than forward.
Down Cycling X28. Ship Recycling and End-of-Life: Lower-grade reuse of recovered materials such as re-rolled mild steel sections.
Down Time Crane X104. Project Cargo Forwarders and Heavy Transport: Hours during which a hired crane is non-productive but still on rate.
Down-Flooding Angle X9. Cargo Securing, Lashing and Stability Vocabulary: Heel at which water enters through unprotected openings.
Down-Flooding Point X9. Cargo Securing, Lashing and Stability Vocabulary: Lowest opening that admits progressive flooding.
Down-Flow Boiler X63. Marine Auxiliary Machinery and Pumps: Boiler design where flue gas travels downward through the convective section.
Down-Wash X31. Helicopter Operations on Ships: Vertical air column produced by rotor blades, affecting personnel and loose deck items.
Downflooding angle B1. Naval Architecture: Heel at which water enters non-weathertight openings.
Downlink X68. Maritime Satcom and Telecommunications: Radio path from satellite to terminal.
Downwelling D1. Physical and chemical oceanography and marine meteorology: Vertical sinking motion of surface water due to convergence or wind forcing.
Downwelling Surface Solar Irradiance D5. Coastal processes, sea-level, cryosphere and ocean observation science: Solar radiation reaching the sea surface.
Downwind X84. Yacht Racing, Regattas and Sailing Governance: The direction toward which the wind is blowing.
Doxford opposed-piston engine X38. Propellers, Stern Gear and Shaft Lines: Historic two-stroke directly coupled to the shaft line on many British-built ships; relevant to legacy torsional vibration cases.
Doxorubicin (marine origin) X10. Marine Biology, Fisheries and Oceanography: Anticancer drug derived from *Streptomyces peucetius*; sometimes cited in marine natural products.
Doxycycline X36. Shipboard Medical, Telemedicine and Seafarer Health: Tetracycline antibiotic also used for malaria prophylaxis and Lyme disease.
DP Advanced X21. STCW Certificates, Crewing and Seafarer Welfare: Dynamic Positioning Advanced or Simulator course, second stage of The Nautical Institute DP scheme.
DP Basic X21. STCW Certificates, Crewing and Seafarer Welfare: Dynamic Positioning Induction course, an industry standard from The Nautical Institute.
DP capability plot B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Sea trial output for DP class.
DP Class 1 X89. ECDIS and Bridge Equipment Makers: Dynamic positioning system without redundancy, defined in IMO MSC/Circ.645.
DP Class 2 X82. Saturation Diving and Offshore Diving Operations: Dynamic positioning notation required for most North Sea DSVs.
DP Class 2 and 3 X139. Maritime Cybersecurity, OT Threats and Standards: Dynamic positioning notations whose redundancy requirements have led IMCA M220 to add cyber assurance guidance.
DP Class 3 X82. Saturation Diving and Offshore Diving Operations: Dynamic positioning notation with full redundancy including separated machinery spaces.
DP Networks X25. Maritime Cybersecurity, OT and IT: Networks supporting dynamic positioning thrusters, references, gyros and operator stations, often dual redundant.
DP Operator Course X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment: Nautical Institute DP Induction, Simulator, and Advanced courses using Kongsberg K-Pos or Marine Technologies BridgeMate simulators.
DP World X46. Container Terminal Operations: The Dubai-headquartered global port operator running container, logistics, and free-zone facilities across more than 70 marine and inland terminals.
DP World Cool Chain X136. Reefer Vessels and Cool Chain Operators: DP World programme expanding reefer plug capacity, controlled atmosphere services, and cold storage adjacency at terminals including Jebel Ali, London Gateway, and Callao.
DP World London Gateway X76. Stevedoring, Lashing and Cargo Securing: Deepwater container terminal east of London, operated by DP World since opening in 2013.
DP World Maritime Services X113. Drydock and Ship Repair Yards: DP World division including Drydocks World Dubai, ASRY Bahrain stake, and related repair and conversion assets.
DP World Posorja X138. Global Container Terminal Operators and Port Equipment: Ecuador deep-water port commissioned August 2019, the country's only Post-Panamax-capable container facility.
DP World Southampton X76. Stevedoring, Lashing and Cargo Securing: Container terminal in Southampton, operated by DP World since 2006 through Southampton Container Terminals.
DP1 X14. Offshore Oil and Gas Marine Operations: Dynamic positioning class with no redundancy; loss of one element can cause position loss.
DP1, DP2, DP3 X25. Maritime Cybersecurity, OT and IT: IMO MSC/Circ.645 dynamic positioning equipment classes used on offshore and cruise vessels.
DP1/DP2/DP3 (IMO MSC/Circ.645 + IMO MSC.1/Circ.1580) E4. Cruise, offshore energy and auxiliary/specialised fleets: Dynamic positioning equipment classes.
DP2 X14. Offshore Oil and Gas Marine Operations: Dynamic positioning class tolerant to any single fault excluding loss of compartment.
DP3 X14. Offshore Oil and Gas Marine Operations: DP class tolerant to any single fault including fire or flood in one compartment.
DPA (Designated Person Ashore) X146. Port State Control Regimes, MoUs, and Inspection Systems: The ISM Code-mandated company contact, whose details PSC verifies during ISM-focused inspections.
DPC X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Deputy Pilot Commissioner, a state-appointed officer overseeing pilotage standards in jurisdictions such as Texas and Louisiana.
DPI (Deep Packet Inspection) X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: A firewall feature used to police NMEA 0183, IEC 61162-450, and Modbus traffic on shipboard segmented networks.
DPP X6. Container, Intermodal and Trade Codes: Direct Port Delivery, Indian customs scheme for moving containers from port straight to importer premises.
DPRK Sanctions Regime E1. Maritime security, geopolitics and risk: UNSC and unilateral measures restricting maritime trade with North Korea.
DPST (Drydock Period for Special Survey) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: 5-yearly class major dock.
DPVOA X82. Saturation Diving and Offshore Diving Operations: Dynamically Positioned Vessel Owners Association, a predecessor body to IMCA.
DR X89. ECDIS and Bridge Equipment Makers: Dead reckoning, the navigation method of projecting position from a known fix using course and speed.
Drachten Maritime Institute Smallingerland X121. Maritime Education, Academies and Universities: Dutch inland and short-sea training provider.
Draft X3. Ship Handling, Seamanship and Deck Vocabulary: Vertical distance from waterline to lowest point of the hull.
Draft (chart) X16. Nautical Science, Navigation and COLREGs: Reference to draught used in under-keel-clearance calculations.
Draft (T) B1. Naval Architecture: Vertical distance from keel to waterline.
Draft Forwarding X86. Port Agency, Husbandry and Disbursement: Transmission of draft documents for review before signing.
Draft Loss X63. Marine Auxiliary Machinery and Pumps: Pressure drop of flue gas across boiler banks, economizer, and stack.
Draft mark B1. Naval Architecture: Numerals on hull indicating draft.
Draft Mark Survey X5. Marine Surveying and Inspection: Verification that draft marks are correctly painted and legible.
Draft Marks F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Numbers on the bow, midship, and stern showing draft.
Draft pipe X45. Marine Paints, Coatings and Antifouling: In-tank construction feature whose coatings are inspected during PSPC sign-off.
Draft Reading X115. Marine Bunker and Cargo Surveying: Visual or instrumental observation of vessel draft at the six standard positions of forward, midship, and aft on both port and starboard sides.
Draft report consultation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Stage at which the investigating State provides its draft report to substantially interested States and to persons whose conduct is likely to be the subject of comment, in accordance with the…
Draft restriction X32. Marine Pilotage and Pilot Operations: Maximum draft permitted on a pilotage transit, set by depth and tide.
Draft restriction (Rhine) X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: Seasonal minimum-water draft on the Middle Rhine, with the gauge at Kaub being the controlling reference during summer low water.
Draft survey C4. Ports, terminals and coastal/marine civil engineering: Cargo weight determination by hydrostatic calculation.
Draft Survey Calculation Sheet X86. Port Agency, Husbandry and Disbursement: Worksheet recording soundings, hydrometer readings, and corrections.
Draft Survey Heavy Lift X104. Project Cargo Forwarders and Heavy Transport: Reading of vessel marks to confirm loaded condition during project cargo operations.
Drafting (award) X152. Maritime Arbitration and Dispute Resolution: Process of writing the tribunal's reasons and operative part, governed by formal requirements at the seat such as section 52 of the English Arbitration Act 1996.
Drafting Errors in Charterparties X51. Maritime Arbitration, Law and BIMCO Clauses: The principles by which tribunals construe or correct manifest mistakes in fixture recaps and addenda.
Drag X3. Ship Handling, Seamanship and Deck Vocabulary: Said of an anchor that fails to hold.
Drag (anchor) X16. Nautical Science, Navigation and COLREGs: Failure of an anchor to hold, allowing the vessel to move.
Drag Anode X100. Marine Cathodic Protection and Anodes: A trailing anode towed behind a vessel, used in some specialty surveys and rarely in modern hull CP.
Drag arm X175. Port Engineering, Dredging, Breakwaters, and Quays: Suction pipe assembly of a TSHD, including gimbal, intermediate sections, and drag head.
Drag chains (launching) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Chains to limit launch travel.
Drag Coefficient D1. Physical and chemical oceanography and marine meteorology: Dimensionless parameter quantifying air-sea momentum transfer.
Drag Embedment Anchor X14. Offshore Oil and Gas Marine Operations: Traditional fluke anchor embedding by horizontal pull.
Drag head C4. Ports, terminals and coastal/marine civil engineering: Drag head of a trailing suction hopper dredger.
Drag head visor X175. Port Engineering, Dredging, Breakwaters, and Quays: Movable shield on a drag head that adjusts to soil conditions and helps direct material into the suction inlet.
Dragarm X124. Dredging Industry and Reclamation Contractors: Outboard suction pipe of a TSHD, ranging up to 155 m on Cristobal Colon.
Drager X82. Saturation Diving and Offshore Diving Operations: German manufacturer of breathing apparatus and rebreathers.
Dragger X87. Fishing Vessels and Fisheries Management: North American colloquial term for a bottom trawler.
Dragging Anchor F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Anchor failing to hold; vessel drifting under chain pull.
Dragline X124. Dredging Industry and Reclamation Contractors: Crawler crane with drag bucket, historically used for marsh dredging.
Dragon X84. Yacht Racing, Regattas and Sailing Governance: A 8.9-meter international one-design keelboat designed by Johan Anker in 1929.
Dragon (HMS) D35 X106. Naval Surface Combatants: Royal Navy Type 45 Daring-class destroyer, commissioned 2012.
Dragon (Minesto) X57. Ocean Energy Beyond Wind: Trade name for Minesto subsea tidal kite devices deployed off the Faroe Islands and tested off Wales.
Dragon Class F4. Recreational Boating, Yachting and Sport: International keelboat class designed by Johan Anker in 1929.
Dragon LNG X56. LNG/LPG Carriers and IGC Code: LNG import terminal at Milford Haven, Wales, jointly owned by Shell and Ancala Partners.
Dragos X25. Maritime Cybersecurity, OT and IT: ICS and OT cybersecurity vendor focused on industrial threat detection and intelligence.
Dragos Year in Review X107. Maritime Cybersecurity and OT Security: Annual report from Dragos documenting industrial threat activity and tracked adversary groups.
Drain Cooler X63. Marine Auxiliary Machinery and Pumps: Heat exchanger that recovers heat from steam condensate before disposal or return.
Drain Down Certificate X50. Ship Recycling, Demolition and Hong Kong Convention: The yard-issued document confirming complete water and hydrocarbon removal from a system before hot work.
Drain hole X26. Reefer Containers and Cold Chain Logistics: T-floor opening allowing defrost water and condensate to exit container.
Drain interval X61. Marine Lubricants and Cylinder Oils: Time or operating hours between system oil changes, extended by good condition monitoring.
Drain oil X61. Marine Lubricants and Cylinder Oils: Used oil scraped down from the cylinder liner of a two-stroke engine, analyzed to monitor wear and BN reserve.
Drain pocket X19. Engine Room Watchkeeping and UMS Operations: Low point in piping with a drain valve for water removal.
Drain-Down X28. Ship Recycling and End-of-Life: Removal of liquids from hydraulic, lubrication, and cooling systems before cutting.
Drainage Pump (Cofferdam) X20. LNG Operations and Custody Transfer: Submersible pump in inerted cofferdam to remove leaked LNG to spray header collection.
Drainage Wells X1. Cargo Science, Commodities and Cargo Care: Bilge wells in dry-cargo holds, gathering water and condensate.
Drainage, condensate X26. Reefer Containers and Cold Chain Logistics: Continuous removal of evaporator drip pan water through floor drains.
Drake Passage X10. Marine Biology, Fisheries and Oceanography: Strait between South America and Antarctica through which the ACC flows.
Drake's Circumnavigation F1. Maritime History: 1577 to 1580 voyage by Francis Drake in the Golden Hind.
Drakkar F1. Maritime History: Norse longship type used for raiding from the eighth to eleventh centuries.
Drape Line X14. Offshore Oil and Gas Marine Operations: Catenary section of a steel catenary riser at touchdown.
Draught Reading X155. Marine Surveying Practice and Cargo Inspection: A simultaneous observation of forward, midship, and aft draft marks on both port and starboard sides, totalling six readings.
Drawdown X103. US Inland Waterway Towing and Barge: A controlled lowering of a navigation pool for maintenance or flood routing.
Drawing Approval Cycle X104. Project Cargo Forwarders and Heavy Transport: Engineering review and sign-off loop between forwarder, contractor, and client.
Drawing register X58. Shipbuilding Yards and Construction: Yard's master list of construction drawings issued for production.
Drawing Review X142. Classification Societies and Class Notations: First step of newbuilding classification covering general arrangement, midship section, machinery plans.
Drax Bioenergy CCS X57. Ocean Energy Beyond Wind: UK BECCS proposal that would feed CO2 into the East Coast Cluster Endurance store.
Drayage C3. Logistics, freight forwarding and multimodal trade: Short haul road movement of containers.
Drayage Tractor X169. Container Terminal Cranes, Yard Equipment, and Lashing: Road-going truck tractor that hauls ocean chassis between marine terminals and inland facilities.
Dreadnought X11. Naval Vessels, Warship Systems and Naval Architecture: HMS Dreadnought 1906, all big-gun turbine battleship that defined the class.
Dreadnought class (UK) X11. Naval Vessels, Warship Systems and Naval Architecture: Royal Navy future SSBN to replace Vanguard from 2030s.
Dreadnought-class X62. Naval Warships and Combat Systems: Royal Navy next-generation ballistic missile submarine class, replacing the Vanguard-class.
Dreadnought, HMS (1875) X39. Pre-1900 Maritime History: Royal Navy turret battleship launched in 1875 (predecessor of the better-known 1906 ship).
Dream Cruises X64. Cruise Industry Operators, Brands and Ships: Asian cruise brand of Genting Hong Kong that ceased operations in 2022.
Drebbel, Cornelis X39. Pre-1900 Maritime History: Dutch inventor who in the 1620s tested an early oar-propelled submersible in the Thames.
Dredge X10. Marine Biology, Fisheries and Oceanography: Towed bottom gear with a rigid frame and bag, used for scallops, oysters, and mussels.
Dredge (Fishing Gear) X87. Fishing Vessels and Fisheries Management: Heavy frame and tooth bar with attached chain or mesh bag, used for scallops, oysters, and clams.
Dredge Cut X13. Marine Salvage and Wreck Removal: Channel excavation to refloat a grounded ship without further hull damage.
Dredge cycle X175. Port Engineering, Dredging, Breakwaters, and Quays: Complete sequence of loading, sailing, discharging, and returning that characterizes TSHD productivity.
Dredge Hopper E4. Cruise, offshore energy and auxiliary/specialised fleets: Cargo hold of a trailing-suction hopper dredger.
Dredge pump X175. Port Engineering, Dredging, Breakwaters, and Quays: Centrifugal pump, mounted inboard or outboard on a dredger, that conveys soil-water slurry through the suction and discharge piping.
Dredge well X124. Dredging Industry and Reclamation Contractors: Hopper opening through which trailing pipe is deployed.
Dredged Channel X103. US Inland Waterway Towing and Barge: A navigation channel maintained at project depth by the US Army Corps of Engineers.
Dredged Finds F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Artifacts recovered during channel dredging in the Thames, Scheldt, and elsewhere.
Dredged material C4. Ports, terminals and coastal/marine civil engineering: Material removed by dredging.
Dredged Material Disposal D3. Marine environmental science, pollution and conservation: Placement of dredged sediments under regulatory permits.
DREDGEPACK X124. Dredging Industry and Reclamation Contractors: HYPACK-derived software suite for hopper and cutter production monitoring.
Dredger X15. Ports, Terminals and Stevedoring: vessel that removes seabed material.
Dredger (TSHD, CSD, BHD, BD) B5. Ship Types and Individual Vessels: Trailing suction, cutter, backhoe, bucket.
Dredging D2. Hydrography, tides, waves, bathymetry and marine geology: Excavation of seabed sediment, often for navigation or reclamation.
Dredging International X124. Dredging Industry and Reclamation Contractors: Former name for DEME's dredging division.
Dredging Summit and Expo (WEDA) X119. Maritime Conferences, Trade Shows and Awards: Annual Western Dredging Association event held in North American cities since 1968.
Dredging tolerance X175. Port Engineering, Dredging, Breakwaters, and Quays: Permitted vertical deviation, including paid overdepth, between the design dredge level and the as-dredged bed.
Dredging waste at yards X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Sediments from access channels and beaching strips that must be managed as part of yard environmental plans.
Dredging window X15. Ports, Terminals and Stevedoring: scheduled period in which dredging is permitted.
Dreissena polymorpha X18. Ballast Water, Biofouling and Antifouling: Zebra mussel, freshwater bivalve invasive in the North American Great Lakes since 1988 via ballast water.
Dreissena rostriformis bugensis X18. Ballast Water, Biofouling and Antifouling: Quagga mussel, sister invader of zebra mussel in the Great Lakes and Europe.
Dressing pack (sterile) X36. Shipboard Medical, Telemedicine and Seafarer Health: Pre-packaged wound dressing materials in IMGS Annex V.
Drettmann Yachts X125. Superyacht Industry, Builders and Brokers: Bremen, Germany brand using subcontracted hulls for the Explorer range.