Glossary

Maritime glossary, terms beginning with D (page 2)

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

Showing 250 of 2401 terms (page 2 of 10).

Dashields Locks and Dam X103. US Inland Waterway Towing and Barge: An Ohio River navigation structure in Pennsylvania.
Dasic Slickgone EW X126. Marine Oil Spill Response and OPRC Regimes: Type 3 concentrate dispersant approved by UK MMO, deliverable from helicopters via spray buckets.
Dasic Slickgone NS X126. Marine Oil Spill Response and OPRC Regimes: Type 2/3 dispersant manufactured by Dasic International, widely stockpiled by OSRL and CEDRE.
DASR X50. Ship Recycling, Demolition and Hong Kong Convention: The Document of Authorization to conduct Ship Recycling, issued by the recycling state competent authority under HKC Regulation 16.
DASR (Damaged Ship Recycling) X118. Ship Recycling Yards, Beaches and Regulation: Informal category for casualty vessels recycled under salvage contracts, typically routed to Aliaga, Brownsville, or specialized European yards.
DASR Renewal Cycle X50. Ship Recycling, Demolition and Hong Kong Convention: The five-year maximum validity period for the Document of Authorization to conduct Ship Recycling.
DAT X52. Polar Code, Arctic and Antarctic Shipping: Double-acting tanker, a hull and propulsion concept designed to operate bow-first in open water and stern-first in heavy ice using Azipod propulsion.
Data Acquisition Rate X96. Hull Integrity Monitoring and Strain Gauges: Sampling frequency of a hull monitoring system, typically 100 to 200 Hz for capturing whipping content.
Data Allowance X68. Maritime Satcom and Telecommunications: Monthly or per-cycle data volume included in a maritime broadband subscription before throttling or charges apply.
Data Collection System (DCS) A3. Marine environmental legislation: MARPOL and its annexes: Required under MARPOL Annex VI Regulation 27.
Data Compression X68. Maritime Satcom and Telecommunications: Reduction of payload size to improve effective throughput across satellite links.
Data Diode X25. Maritime Cybersecurity, OT and IT: One-way hardware enforced gateway used to send OT telemetry to IT without enabling reverse access.
Data Exfiltration X48. Maritime Cybersecurity: Unauthorized transfer of data from a shipping company network to an external location.
Data Integrity X139. Maritime Cybersecurity, OT Threats and Standards: Property addressed by IEC 62443-3-3 SR 3.1, essential for ECDIS chart and loading computer outputs.
Data Integrity Check X40. Tanker Vetting, SIRE and VIQ: A SIRE 2.0 platform routine that flags inconsistencies between the captured questionnaire data and the photographs or evidence attached.
Data Link Layer X109. Maritime Autonomous Surface Ships and MASS Code: The protocol layer that frames bits over a maritime radio or satellite link for MASS telemetry and control.
Data logger X26. Reefer Containers and Cold Chain Logistics: Standalone or embedded device recording temperature, humidity, and sometimes gas composition.
Data Logging Standard X109. Maritime Autonomous Surface Ships and MASS Code: A specification defining which autonomy variables must be recorded and retained, supporting class survey and incident review.
Data Loss Prevention X48. Maritime Cybersecurity: Technical and procedural controls that detect or block unauthorized movement of sensitive data.
Data Loss Prevention (DLP) X25. Maritime Cybersecurity, OT and IT: Technology that inspects content to prevent unauthorized data transfer.
Data Sanitization X48. Maritime Cybersecurity: Procedure to remove data from shipboard storage before disposal or transfer.
DataLastic X78. Voyage Optimization and Vessel Performance Software: A maritime data provider offering AIS, vessel particulars, and port call APIs used by analytics and routing applications.
dataMARITIME X74. AIS Data, Vessel Tracking and Maritime Intelligence: Brazilian provider of port call and vessel movement analytics.
Dataset X73. Marine Hydrography, Charting and ENC: A single S-57 ENC file or update; one of the .000, .001, .002 sequence.
Date of Attachment X4. Marine Insurance, P&I and Claims: the date risk under the policy begins.
Date of Build X5. Marine Surveying and Inspection: Build completion date affecting survey cycles and PSC targeting.
Date of Loss X53. Marine Insurance, P&I and Hull Clauses: The date assigned to a loss for the purpose of underwriting year allocation, often the date of the casualty rather than the date of claim.
Date of Termination X99. Marine Salvage Awards and SCOPIC: Date on which salvage services end, fixing the salved fund and stopping accrual of SCOPIC remuneration.
Datrex X95. GMDSS Equipment and Survival Craft Communications: United States manufacturer of marine survival equipment including hydrostatic release units, EPIRB brackets, and emergency rations.
Datum X73. Marine Hydrography, Charting and ENC: The horizontal or vertical reference frame; ENC horizontal datum is mandatorily WGS-84.
Datum (chart) X16. Nautical Science, Navigation and COLREGs: Reference plane for soundings; see Chart datum.
Datum (horizontal) X16. Nautical Science, Navigation and COLREGs: Reference ellipsoid for positions, e.g., WGS-84.
Datum Area X80. Maritime Search and Rescue Coordination: Circular zone of uncertainty around the calculated datum.
Datum Line X80. Maritime Search and Rescue Coordination: Linear datum where survivor position lies along a probable track.
Datum Marker Buoy X80. Maritime Search and Rescue Coordination: Drifting buoy deployed to measure local drift for datum refinement.
Datum Mismatch X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Cable burial reporting issue arising when survey datums (WGS84 vs ED50) are not harmonized between baseline and as-laid surveys.
Datum reset (ECDIS) B3. Nautical Science: Operation to update WGS-84 datum offsets.
Datum Transformation D2. Hydrography, tides, waves, bathymetry and marine geology: Conversion between different geodetic datums.
Daughter Craft X82. Saturation Diving and Offshore Diving Operations: Small launch carried by a DSV for nearshore tasks.
Daughter Ship X51. Maritime Arbitration, Law and BIMCO Clauses: A vessel arrested as substitute for the offending vessel under sister-ship arrest principles.
Daughter Vessel X13. Marine Salvage and Wreck Removal: Smaller craft launched from a salvage mother ship for shallow water work.
Dauntless (HMS) D33 X106. Naval Surface Combatants: Royal Navy Type 45 Daring-class destroyer, commissioned 2010.
Dauntless, USCGC (WMEC-624) X130. National Coast Guards and Cutter Fleets: Reliance-class medium endurance cutter commissioned 1968, homeported Pensacola, Florida.
Daurade X65. ROVs, AUVs, USVs and Marine Robotics: Mid-size MCM AUV from ECA Group used by the French Navy for mine reconnaissance.
Davie Shipbuilding X58. Shipbuilding Yards and Construction: Canadian shipyard at Levis, Quebec, the country's largest, building icebreakers and naval auxiliaries.
Davis Contractors Ltd v Fareham UDC [1956] AC 696 X143. Landmark Maritime Law Cases and Doctrines: House of Lords articulation of frustration, applied in maritime charters.
Davis Quadrant F1. Maritime History: Backstaff invented by John Davis around 1594.
Davis Station X133. Polar Research Vessels and Polar Code Regimes: Australian year-round Antarctic station in the Vestfold Hills, supplied by RSV Nuyina.
Davis Strait X10. Marine Biology, Fisheries and Oceanography: Strait between Greenland and Baffin Island.
Davit X3. Ship Handling, Seamanship and Deck Vocabulary: Curved crane for hoisting and lowering boats and stores.
Davit Crane X81. Project Cargo, Heavy-Lift and Module Carriers: Light-duty crane used on MPP vessels for stores and small parcels, distinct from main heavy-lift cranes.
Davit Survey X5. Marine Surveying and Inspection: Examination and load testing of lifeboat and rescue boat launching appliances.
Davit-launched lifeboat X24. Cruise, Passenger Ship and Ferry Operations: SOLAS III lifeboat lowered by gravity davits on a passenger ship.
Davits X64. Cruise Industry Operators, Brands and Ships: Shipboard cranes used to lower lifeboats and tenders.
Davy Jones's Locker F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Sailor folklore name for the seabed and resting place of drowned mariners.
DAWE X18. Ballast Water, Biofouling and Antifouling: Australian Department of Agriculture, Water and the Environment, now DAFF, administering biofouling requirements.
Day Flight X31. Helicopter Operations on Ships: Helicopter operation conducted in daylight under visual conditions.
Day Marker X103. US Inland Waterway Towing and Barge: An unlit aid to navigation, typically a green square or red triangle on a pile or shore.
Day of the Seafarer X119. Maritime Conferences, Trade Shows and Awards: Annual IMO observance on June 25, established by IMO Resolution at the 2010 Manila Diplomatic Conference.
Day pilot X32. Marine Pilotage and Pilot Operations: Pilot rostered for daylight hours only on a station with split watches.
Day rate X59. Offshore Wind O&M, CTVs and SOVs: See charter day rate.
Day Rate Crane X104. Project Cargo Forwarders and Heavy Transport: Hire rate charged per calendar day for a mobilized heavy crane.
Day Sailer F4. Recreational Boating, Yachting and Sport: Small open keelboat or dinghy for daytime sailing.
Day's run X16. Nautical Science, Navigation and COLREGs: Distance traveled in 24 hours, noon to noon.
Daylight saving time X16. Nautical Science, Navigation and COLREGs: Civil time adjustment; not used in nautical chronometry.
Daylight transit X32. Marine Pilotage and Pilot Operations: Voyage segment restricted by pilotage authority to hours of daylight, common on the Great Barrier Reef Inner Route.
Daymark X3. Ship Handling, Seamanship and Deck Vocabulary: Distinctive shape hoisted in daylight to indicate a vessel's status.
Days alongside X15. Ports, Terminals and Stevedoring: vessel time at berth between first and last line.
Days at Sea X87. Fishing Vessels and Fisheries Management: Effort based management metric, used in EU and US plans to limit fishing time per vessel.
Days of Grace X4. Marine Insurance, P&I and Claims: period allowing late payment of premium without loss of cover, no longer commonly granted in marine.
Days off hire C1. Commercial shipping, chartering, economics and finance: Period during which hire is not payable under a time charter.
Days on Hire (Tariff) X99. Marine Salvage Awards and SCOPIC: Period for which SCOPIC tariff rates apply to a tug or piece of equipment.
Days-at-Sea (DAS) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Effort control regime used in the US Northeast Multispecies fishery and historically in the EU western waters cod recovery plan.
Daysailer Cup F4. Recreational Boating, Yachting and Sport: Common name for one-design regattas.
Daytona (no entry) X16. Nautical Science, Navigation and COLREGs: Not a navigational term.
Dazzle camouflage X11. Naval Vessels, Warship Systems and Naval Architecture: World War I disruptive paint scheme on warships.
DB Schenker X104. Project Cargo Forwarders and Heavy Transport: Hamburg-based logistics arm of Deutsche Bahn with a global project and industrial division.
DBB Jack-Up Services X123. Offshore Wind Installation Vessels and Operators: German jack-up operator with vessels Bold Tern and Brave Tern under management agreement with Fred. Olsen Windcarrier.
DBSV (Digital Bathymetric Survey Vessel) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Generic term for purpose-built modern survey craft with integrated multibeam, INS, and acquisition software.
DC Bus X67. Marine Electrical Systems and Shore Power: Common direct-current distribution rail in an Onboard DC Grid or hybrid power system.
DC link X19. Engine Room Watchkeeping and UMS Operations: Direct current bus in frequency converters used for shaft generators and pod drives.
DC Power Source X100. Marine Cathodic Protection and Anodes: The rectifier or transformer-rectifier that supplies direct current to the anodes of an ICCP system.
DCBA X102. Seafarer Welfare and Maritime Charities: Designated CBA, the IBF-approved wage scale applicable to a specific FoC vessel.
DCBL X82. Saturation Diving and Offshore Diving Operations: Dive Council UK, an industry diver welfare and standards forum.
DCG90-9 X169. Container Terminal Cranes, Yard Equipment, and Lashing: Kalmar empty container handler with 9 ton capacity at the top of the spreader, used for stacking empty containers up to eight high.
DCI X124. Dredging Industry and Reclamation Contractors: Dredging Corporation of India, public-sector dredger headquartered in Visakhapatnam.
DCNS X11. Naval Vessels, Warship Systems and Naval Architecture: French naval prime contractor, since 2017 Naval Group.
DCO X13. Marine Salvage and Wreck Removal: Designated Casualty Officer in some flag administrations responsible for intervention.
DCOIT X45. Marine Paints, Coatings and Antifouling: 4,5-Dichloro-2-octyl-4-isothiazolin-3-one, a booster biocide marketed under the trade name Sea-Nine 211.
DCOIT (Sea-Nine 211) X18. Ballast Water, Biofouling and Antifouling: 4,5-dichloro-2-octyl-4-isothiazolin-3-one, a booster biocide used in antifouling paints.
DCP X31. Helicopter Operations on Ships: Dry Chemical Powder, monoammonium phosphate based fire-extinguishing agent in 45 kg helideck units.
DCPA X16. Nautical Science, Navigation and COLREGs: Distance at the closest point of approach (synonym for CPA).
DCS A2. Maritime safety legislation: SOLAS and its codes: IMO Data Collection System on fuel oil consumption, MARPOL Annex VI, cross-referenced with SOLAS chapter requirements.
DCS (Data Collection System) X78. Voyage Optimization and Vessel Performance Software: The IMO regulation requiring ships above 5,000 gross tonnage to report annual fuel oil consumption and related data to the Organization through their flag.
DCS (IMO Data Collection System) D6. Decarbonization, emissions and alternative fuels: Mandatory fuel oil consumption data reporting since 2019.
DCS Annual Report X72. Bunkering Hubs and Bunker Suppliers: IMO Data Collection System annual fuel oil consumption report submitted by ships of 5,000 gross tonnage and above.
DCS Type 1 X82. Saturation Diving and Offshore Diving Operations: Pain-only decompression sickness affecting joints, skin, and lymphatic tissue.
DCS Type 2 X82. Saturation Diving and Offshore Diving Operations: Neurological or cardiopulmonary decompression sickness requiring urgent recompression.
DCSA C3. Logistics, freight forwarding and multimodal trade: Digital Container Shipping Association.
DCSA (Digital Container Shipping Association) E3. Technology, digitalization and smart shipping: Industry body standardizing container data flows.
DCSA eBL X6. Container, Intermodal and Trade Codes: DCSA's electronic bill of lading data and process standard.
DCSA eBL Standard E3. Technology, digitalization and smart shipping: Interoperability standard for electronic bills of lading.
DCT (Dynamic Compaction Test) X5. Marine Surveying and Inspection: Test used in dredger and barge surveys for cargo settlement.
DCT Gdansk X15. Ports, Terminals and Stevedoring: Deepwater Container Terminal operated by PSA in Poland.
DD X11. Naval Vessels, Warship Systems and Naval Architecture: Destroyer hull symbol without missile fit.
DDG E2. Naval, defence and maritime law enforcement: Guided-missile destroyer.
DDG (Maritime Safety), DG Shipping India X163. Marine Accident Investigation Agencies and Landmark Inquiries: Deputy Director General (Maritime Safety) branch of the Indian Directorate General of Shipping in Mumbai, which discharges the Indian flag State investigation function.
DDG-1000 X62. Naval Warships and Combat Systems: Hull number of USS Zumwalt, lead ship of the Zumwalt-class guided-missile destroyers.
DDG-1000 Zumwalt X11. Naval Vessels, Warship Systems and Naval Architecture: USN tumblehome stealth destroyer with two 155 mm AGS.
DDG-51 X11. Naval Vessels, Warship Systems and Naval Architecture: USN Arleigh Burke class hull number for lead ship.
DDGS X103. US Inland Waterway Towing and Barge: Distillers Dried Grains with Solubles, a co-product of ethanol production frequently moved in covered hopper barges.
DDH X11. Naval Vessels, Warship Systems and Naval Architecture: Helicopter destroyer hull symbol, JMSDF usage for Hyuga and Izumo.
DDM X49. Ship Finance, Leasing and Maritime Capital Markets: Dividend discount model used by analysts valuing tanker and dry bulk equities.
DDoS X107. Maritime Cybersecurity and OT Security: Distributed Denial of Service attack using many sources to overwhelm a target system.
DDoS Distributed Denial of Service X25. Maritime Cybersecurity, OT and IT: Attack flooding a target with traffic from many sources.
De Beers Marine X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: South African operator of subsea mining vessels off Namibia, with seabed activities coordinated with MSP for cable routes.
De Brauw Blackstone Westbroek X114. Maritime Arbitration and Shipping Law Firms: Leading Dutch firm with an Amsterdam shipping practice.
De Gallant X128. Sail Training Ships and Tall Ship Associations: Dutch two masted gaff topsail schooner built 1916, 32 m length, used for cargo under sail and youth voyages.
De Hoop Lobith X124. Dredging Industry and Reclamation Contractors: Dutch builder of tugs and pontoons supporting dredging.
De Nora X100. Marine Cathodic Protection and Anodes: A supplier of mixed-metal-oxide anodes and electrochemical equipment for cathodic protection.
De Vries Scheepsbouw X125. Superyacht Industry, Builders and Brokers: Aalsmeer, Netherlands Feadship yard, formally Koninklijke De Vries Scheepsbouw.
De Zeven Provincien class X11. Naval Vessels, Warship Systems and Naval Architecture: Royal Netherlands Navy LCF air-defense frigate with APAR and SMART-L.
De-aerator X19. Engine Room Watchkeeping and UMS Operations: Vessel removing dissolved oxygen from boiler feed water.
De-bunker X149. Marine Fuels, Bunkering, and Alternative Fuels: To remove fuel previously loaded onto a vessel, typically for off-spec product or compatibility reasons.
De-Bunkering Plan X50. Ship Recycling, Demolition and Hong Kong Convention: The Ship Recycling Plan section governing the safe removal of residual bunker fuel before hot work commences.
De-emphasis X68. Maritime Satcom and Telecommunications: Receive-side filtering used in some legacy satellite voice systems.
De-icing X133. Polar Research Vessels and Polar Code Regimes: Polar Code requires means to remove and prevent ice on superstructure, walkways and lifesaving equipment.
De-Oiling Tank X63. Marine Auxiliary Machinery and Pumps: Sludge or bilge tank that allows oil and water to gravity-separate before further treatment.
De-pilotage X32. Marine Pilotage and Pilot Operations: Disembarkation of the pilot at the outbound pilot station.
De-Risking X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The withdrawal of banking, insurance, and classification services from segments of the maritime sector judged too compliance-intensive after sanctions expansion.
De-Watering Pump X60. Marine Salvage and Wreck Removal: Submersible or surface mounted pump used to remove water from flooded compartments.
Deacon Cell D1. Physical and chemical oceanography and marine meteorology: Apparent meridional overturning cell in the Southern Ocean, largely an artifact of Eulerian averaging.
Dead ahead X3. Ship Handling, Seamanship and Deck Vocabulary: Directly forward.
Dead astern X3. Ship Handling, Seamanship and Deck Vocabulary: Directly behind.
Dead Bus Closure X67. Marine Electrical Systems and Shore Power: Closing a generator breaker onto a de-energized busbar without synchronization.
Dead freight X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Charge for unused bunker capacity reserved but not delivered.
Dead freight broker note X71. Shipbrokers and Brokerage Firms: Broker confirmation of compensation for unloaded cargo.
Dead front antifouling X45. Marine Paints, Coatings and Antifouling: Layer of leached antifouling no longer releasing biocide effectively, requiring removal at drydock.
Dead Front Switchboard X67. Marine Electrical Systems and Shore Power: Switchboard design where all live parts are inaccessible from the front, mandatory on modern ships.
Dead load X15. Ports, Terminals and Stevedoring: static weight of crane structure on the rails.
Dead man alarm X19. Engine Room Watchkeeping and UMS Operations: ECR system detecting engineer movement during unattended operation, alarms ECR then bridge if not reset.
Dead man switch X19. Engine Room Watchkeeping and UMS Operations: Push reset button at machinery space control points satisfying the dead man timer.
Dead reckoning X3. Ship Handling, Seamanship and Deck Vocabulary: Position calculation from course, speed and time without external fixes.
Dead reckoning (DR) B3. Nautical Science: Position by course and speed without external fix.
Dead Reefer X83. ISO Container Manufacturing and Leasing: Refrigerated container shipped without power connection for use as a dry box or for unit testing.
Dead ship condition X19. Engine Room Watchkeeping and UMS Operations: SOLAS II-1/3-1.3 condition where main and auxiliary machinery is dead, requiring autonomous restoration.
Dead Ship Salvage X60. Marine Salvage and Wreck Removal: Operations on a vessel with no propulsion or auxiliary power available.
Dead slow X3. Ship Handling, Seamanship and Deck Vocabulary: Slowest engine order ahead or astern.
Dead slow ahead X19. Engine Room Watchkeeping and UMS Operations: Lowest ordered speed on the engine telegraph, near minimum sustained engine rpm.
Dead watch X19. Engine Room Watchkeeping and UMS Operations: Colloquial term for the 00 to 04 watch, kept by the second engineer in the conventional rotation.
Dead Weight Scale X155. Marine Surveying Practice and Cargo Inspection: A graphical or tabular shipyard document relating mean draft to displacement, used as a cross-check to hydrostatic tables.
Dead Zone D3. Marine environmental science, pollution and conservation: Hypoxic or anoxic area incapable of supporting most marine life.
Deadband Test X5. Marine Surveying and Inspection: Calibration check on level alarms during automation surveys.
Deadeye X3. Ship Handling, Seamanship and Deck Vocabulary: Round wooden block with three holes used with lanyards to set up shrouds.
Deadfreight A5. Maritime Law, private and commercial: Compensation payable for cargo short-shipped under a charterparty.
Deadfreight Survey X115. Marine Bunker and Cargo Surveying: Quantification of cargo capacity not utilized at loading, used as a basis for deadfreight claims under charter party.
Deadman anchor X175. Port Engineering, Dredging, Breakwaters, and Quays: Buried plate or concrete block anchor that resists the tie-rod force of an anchored sheet pile quay.
Deadman switch X15. Ports, Terminals and Stevedoring: operator-presence control on cranes and forklifts.
Deadman Valve X88. Marine Surface Preparation and Coatings Application: Spring-loaded blast control handle required by OSHA 29 CFR 1910.244(b) that stops abrasive and air flow when released by the operator.
Deadweight X6. Container, Intermodal and Trade Codes: Carrying capacity of a vessel in metric tonnes.
Deadweight (DWT) B1. Naval Architecture: Difference between loaded and lightship displacement.
Deadweight all told C1. Commercial shipping, chartering, economics and finance: DWAT, total deadweight including bunkers, stores, and cargo.
Deadweight Capacity Heavy Lift X104. Project Cargo Forwarders and Heavy Transport: Maximum cargo weight a heavy lift vessel can carry to a stated draft.
Deadweight cargo capacity C1. Commercial shipping, chartering, economics and finance: DWCC, deadweight available for cargo after bunkers and stores.
Deadweight Cargo Capacity (DWCC) X1. Cargo Science, Commodities and Cargo Care: Maximum cargo weight ship can carry, after fuel, water, stores.
Deadweight Constant X5. Marine Surveying and Inspection: Sum of fixed weights not declared individually in draft survey calculations.
Deadweight scale B1. Naval Architecture: Tabulation of drafts versus deadweight at given densities.
Deadweight Survey X5. Marine Surveying and Inspection: Determination of available deadweight at given draft using hydrostatics.
Deadweight survey (sea trial) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Draft survey verifying lightship weight.
Deadweight to LDT Ratio X118. Ship Recycling Yards, Beaches and Regulation: Approximate conversion factor of 5:1 to 8:1 for bulkers and tankers, used by cash buyers to estimate LDT from published DWT.
Deadweight tonnage C1. Commercial shipping, chartering, economics and finance: DWT, total weight a vessel can carry.
Deadweight Tonnage (DWT) F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Maximum mass of cargo, fuel, stores, water, and crew a vessel can carry.
Deadweight, allowable X76. Stevedoring, Lashing and Cargo Securing: Cargo carrying capacity that influences how many containers can be stowed and lashed.
Deadweight, building X58. Shipbuilding Yards and Construction: Designed cargo deadweight tonnage specified in the shipbuilding contract.
Death and Disability Compensation X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Standard amounts paid under ITF TCC and IBF agreements to seafarers' families, distinct from statutory P&I cover.
Death certificate at sea X36. Shipboard Medical, Telemedicine and Seafarer Health: Document drawn by master under flag-state law and recorded in Official Log Book.
Deballasting C2. Ship operations, crewing and technical management: Discharging ballast water.
Deballasting Survey X115. Marine Bunker and Cargo Surveying: Verification of ballast water discharged and recorded between loading legs, often combined with cargo draft surveys.
Debattista X114. Maritime Arbitration and Shipping Law Firms: Charles Debattista, academic and arbitrator known for trade and shipping work.
Debris Flow D2. Hydrography, tides, waves, bathymetry and marine geology: Gravity-driven sediment flow on the seafloor.
Debris Sampling X115. Marine Bunker and Cargo Surveying: Collection of solid debris from cargo holds or tanks for analytical identification when contamination is suspected.
Debris Tracking D3. Marine environmental science, pollution and conservation: Modeling and observation of marine litter trajectories.
Debt Service Coverage Ratio X49. Ship Finance, Leasing and Maritime Capital Markets: Ratio of operating cash flow to scheduled debt service on a ship loan.
Debt to EBITDA X49. Ship Finance, Leasing and Maritime Capital Markets: Leverage metric tracked at the corporate level by listed shipping companies.
Debunkering X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Removal of off-spec or unwanted fuel from ship tanks back to barge or shore.
DEC Marine ECS X69. EGCS Scrubbers, SCR and Marine Air Emissions: Marine exhaust cleaning system product line associated with EcoSpray Technologies.
DECA X69. EGCS Scrubbers, SCR and Marine Air Emissions: Domestic Emission Control Area, primarily used to refer to Chinese coastal sulfur control zones.
Decadal Variability D1. Physical and chemical oceanography and marine meteorology: Climate variability on roughly 10-year timescales, such as the Pacific Decadal Oscillation.
Decant X124. Dredging Industry and Reclamation Contractors: Overflow of clarified water from hopper or reclamation bund during loading or filling.
Decanting X28. Ship Recycling and End-of-Life: Transfer of residual oils between tanks to consolidate before discharge to reception facilities.
Decapod X10. Marine Biology, Fisheries and Oceanography: Crustacean order Decapoda, including shrimp, lobsters, crayfish, and crabs.
Decarbonisation Insights X112. IMO GHG Strategy, CII, EEXI and EU Maritime Regulation: DNV digital service providing strategic and regulatory advisory under the Veracity ecosystem.
Decarbonization corridor X15. Ports, Terminals and Stevedoring: green shipping route between participating ports.
Decarbonization pathway X34. Decarbonization, Alternative Fuels and Carbon Pricing: Sequence of measures (operational, technical, fuel switch) leading to net-zero emissions.
Decarbonization Readiness Survey X43. Marine Surveying and Warranty Surveying: An emerging consultancy product assessing a vessel's suitability for retrofits such as wind-assist, alternative fuels, or energy-saving devices.
Decarbonization Retrofit X113. Drydock and Ship Repair Yards: Drydock works adapting a vessel for lower-carbon operation such as wind-assist installation or dual-fuel conversion.
Decca X16. Nautical Science, Navigation and COLREGs: Obsolete hyperbolic radio-navigation system, decommissioned 2000.
Decca Chart X73. Marine Hydrography, Charting and ENC: A historic lattice chart for Decca Navigator hyperbolic fixing, withdrawn from carriage requirements after 2000.
Decca Navigator D2. Hydrography, tides, waves, bathymetry and marine geology: Historic radio navigation system used in hydrographic surveys.
Decca SAR X80. Maritime Search and Rescue Coordination: Historical UK SAR navigation aid superseded by GPS.
Decelerating duct (pump-jet) X38. Propellers, Stern Gear and Shaft Lines: Annular duct profiled to decelerate flow into the propulsor, used on naval submarines for noise reduction.
Decent Work Agenda X154. Maritime Welfare, Seafarer Charities, and MLC Rights: ILO framing within which MLC 2006 sits as the seafarers' bill of rights.
Deception Island X97. Polar Expedition Cruise and IAATO Operations: Active volcanic caldera in the South Shetland Islands containing the historic Whalers Bay station.
Deceptive Shipping Practices X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The seven categories enumerated in OFAC's May 14 2020 advisory: AIS disablement, document falsification, flag-hopping, STS transfers, voyage irregularities, false flag usage, and complex ownership…
Decibel re 1 micropascal F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Standard reference for underwater sound pressure level.
Decimeter scale roughness X165. Marine Coatings, Antifouling, and Hull Husbandry: Long-wavelength hull roughness contributing to frictional drag, measured as average hull roughness in micrometers.
Decision (EU) 2018/1906 X28. Ship Recycling and End-of-Life: Updated European List of ship recycling facilities.
Decision 2016/2323 X28. Ship Recycling and End-of-Life: First European List of Ship Recycling Facilities under Regulation 1257/2013.
Decision of investigation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Formal decision by the State conducting the marine safety investigation as to whether and how the investigation will proceed.
Decision on Jurisdiction X114. Maritime Arbitration and Shipping Law Firms: Ruling by a tribunal on its own competence, often issued as an interim award.
Decision Support System X109. Maritime Autonomous Surface Ships and MASS Code: A Degree 1 MASS aid that provides recommendations to seafarers without taking control of the ship.
Decision Support System (Bridge) E3. Technology, digitalization and smart shipping: Software aiding collision avoidance and route planning.
Decision support tool X18. Ballast Water, Biofouling and Antifouling: Software used to determine whether ballast operations comply with port and convention requirements.
Decision Tree Logic X109. Maritime Autonomous Surface Ships and MASS Code: A structured set of rules used in early collision avoidance modules to encode COLREGs application.
Decisive X122. Submarine Cable Laying, Repair Vessels and Operators: SubCom cable ship, ex-USNS Adventurous T-AGOS-13, converted to a CRV operating from Portland UK and Curacao depots.
Deck X3. Ship Handling, Seamanship and Deck Vocabulary: Horizontal platform in a ship.
Deck Barge X13. Marine Salvage and Wreck Removal: Flat-decked unmanned barge used to carry pumps, salvage gear, and recovered wreckage.
Deck Beam Lay Out X104. Project Cargo Forwarders and Heavy Transport: Pattern of cross beams on a heavy lift vessel deck designed to spread point loads.
Deck block X58. Shipbuilding Yards and Construction: Single-deck unit including beams, longitudinals, and pillars assembled in the panel shop.
Deck Cadet F3. Seafaring Life, Education, Professions and Institutions: Trainee deck officer in initial sea phase.
Deck cargo X3. Ship Handling, Seamanship and Deck Vocabulary: Cargo carried on the weather deck.
Deck Cargo Barge E4. Cruise, offshore energy and auxiliary/specialised fleets: Non-propelled deck barge.
Deck Cargo Clause X51. Maritime Arbitration, Law and BIMCO Clauses: A bill of lading provision recording the parties' agreement that cargo is carried on deck at shipper's risk.
Deck Cargo Convention X104. Project Cargo Forwarders and Heavy Transport: IMO instrument covering carriage of deck stowed project cargo.
Deck Cargo Salvage X99. Marine Salvage Awards and SCOPIC: Recovery of cargo carried on deck, often the most exposed to loss after structural damage or list.
Deck Cargo Survey X43. Marine Surveying and Warranty Surveying: A specialist inspection of cargo carried on weather decks, focusing on securing, weather protection, and stability impact.
Deck Cargo Vessel X81. Project Cargo, Heavy-Lift and Module Carriers: Open-deck vessel designed for transport of oversized cargo on deck, often without cargo holds.
Deck container stack X76. Stevedoring, Lashing and Cargo Securing: Vertical column of containers loaded above the hatch covers, requiring external lashings.
Deck Covering Inventory X50. Ship Recycling, Demolition and Hong Kong Convention: The IHM Part I record of magnesite, latex, and polymer deck underlays that may contain regulated materials.
Deck crane X15. Ports, Terminals and Stevedoring: ship-mounted crane used for self-discharge.
Deck crane (hydraulic) B2. Marine Engineering: Hydraulically driven cargo crane.
Deck D-Ring X9. Cargo Securing, Lashing and Stability Vocabulary: Welded D-shaped lashing point on weather deck.
Deck Discharge Connection X69. EGCS Scrubbers, SCR and Marine Air Emissions: Standardized international shore connection for offloading sludge or spent washwater.
Deck Drain X41. Cruise Ship Public Health and VSP/USPH: Plumbing fixture serving galley floors, required to be indirect with an air gap to prevent sewer backflow.
Deck Edge X31. Helicopter Operations on Ships: Outer perimeter of helideck, marked with white edge line.
Deck eye X76. Stevedoring, Lashing and Cargo Securing: Lashing eye plate welded to the main deck or hatch top.
Deck Fitting X9. Cargo Securing, Lashing and Stability Vocabulary: Any welded or bolted device for cargo securing.
Deck Floodlights X22. Piracy, Maritime Security and Armed Protection: BMP recommended high intensity lighting illuminating the main deck and overside areas during darkness.
Deck head X125. Superyacht Industry, Builders and Brokers: The yachting term for the ceiling of an interior space.
Deck house block X58. Shipbuilding Yards and Construction: Accommodation block built up separately and lifted onto the main hull during erection.
Deck Landing Officer X31. Helicopter Operations on Ships: Officer responsible for helicopter movements on deck, often combined with HLO role.
Deck Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing anchored to weather deck fittings.
Deck Load X9. Cargo Securing, Lashing and Stability Vocabulary: Mass per square meter on deck plating; limited by classification rules.
Deck log B3. Nautical Science: Official bridge log book.
Deck Log Book X66. Port State Control and Regional MOUs: Document checked during initial PSC inspection.
Deck Log Examination X155. Marine Surveying Practice and Cargo Inspection: The surveyor's scrutiny of bridge log entries for weather, ventilation, and operational decisions during a claim investigation.
Deck Log Tradition F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Customary practice of daily entries valued in heritage interpretation.
Deck Longitudinal Strain Gauge X96. Hull Integrity Monitoring and Strain Gauges: Strain gauge bonded to a deck longitudinal stiffener at midship to capture hull girder bending response.
Deck machinery B2. Marine Engineering: Anchor windlass, mooring winches, and cranes.
Deck machinery oil X61. Marine Lubricants and Cylinder Oils: Hydraulic and gear oils used in winches, cranes, and hatch cover systems, typically ISO VG 32 to 220.