Glossary

Maritime glossary, terms beginning with D (page 6)

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

Showing 250 of 2401 terms (page 6 of 10).

Diplomatic Conference A1. The IMO and the international regulatory framework: Plenipotentiary meeting that adopts a new IMO convention or major protocol.
Diplomatic Note (Price Cap) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: A Coalition communication mechanism used to update price-cap levels and review compliance.
Dipping Acid X75. IMDG Code, Classes, Packing and Segregation: Common industry term for mixed nitric and sulfuric acid, regulated as UN 1796 Class 8 with Class 5.1 subsidiary risk.
Dipping lug X3. Ship Handling, Seamanship and Deck Vocabulary: Lugsail shifted to leeward of the mast on each tack.
Dipping sonar X11. Naval Vessels, Warship Systems and Naval Architecture: Helicopter-deployed active/passive sonar, e.g., FLASH and AQS-22.
Direccion General de Territorio Maritimo y de Marina Mercante (DIRECTEMAR / DGTM) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Chilean maritime authority under the Chilean Navy that conducts maritime accident investigations in Chilean jurisdiction.
Direct Action X4. Marine Insurance, P&I and Claims: statutory right to sue the liability insurer directly, granted in some jurisdictions but limited by pay-to-be-paid in P&I.
Direct Action by Cargo X99. Marine Salvage Awards and SCOPIC: Right of cargo interests to participate directly in salvage arbitration to protect their share of contribution.
Direct Action Statute X53. Marine Insurance, P&I and Hull Clauses: A statute, such as Louisiana's, permitting third-party claimants to sue the insurer directly, of particular concern for P&I clubs.
Direct Air Capture (DAC) D6. Decarbonization, emissions and alternative fuels: Extraction of CO2 directly from ambient air.
Direct Burial X91. Submarines and Submarine Cable Systems: Submarine cable installation method placing the cable directly into a trenched seabed.
Direct Burial Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Subsea cable designed for installation without conduit, relying on armor and burial for protection.
Direct calculation (PC) X27. Polar Code, Ice Navigation and Polar Operations: First principles structural design method allowed in addition to IACS UR I formulas.
Direct calculation method B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: FE-based strength check per class.
Direct call X6. Container, Intermodal and Trade Codes: Vessel service calling a port without transhipment.
Direct Communication X80. Maritime Search and Rescue Coordination: SMC to OSC voice or data link unmediated by relay stations.
Direct Connection X41. Cruise Ship Public Health and VSP/USPH: Physical joining of two piping systems, prohibited between potable and non-potable services.
Direct coupled X19. Engine Room Watchkeeping and UMS Operations: Generator or pump driven without gearing.
Direct delivery C3. Logistics, freight forwarding and multimodal trade: Cargo discharged direct ex-ship to consignee transport.
Direct examination X152. Maritime Arbitration and Dispute Resolution: Initial questioning of a witness by the party calling them; in many maritime arbitrations replaced by written witness statements taken as evidence in chief.
Direct Insurance X117. Marine Insurance Markets, Captives and Reinsurance: Insurance written on a policy issued directly to the assured, distinct from reinsurance.
Direct Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing from a fixed point on the ship to a fixed point on the cargo.
Direct Lift Method X167. Major Salvage Companies, Wreck Removals, and Equipment: Wreck removal technique using strand jacks or cranes attached to slings or chains passed beneath the hull.
Direct Measurement Method X69. EGCS Scrubbers, SCR and Marine Air Emissions: Sulfur compliance verification through onboard SO2/CO2 measurement.
Direct Mode X30. Tug Operations and Harbour Towage: Escort tug operation pulling along the line of the towline, generating force primarily from propeller thrust.
Direct On Line Starter X67. Marine Electrical Systems and Shore Power: Motor starter that connects the motor directly to full line voltage, used for small marine motors.
Direct Quenching X92. Marine Steel Suppliers and Shipbuilding Plate: DQ process in which hot rolled plate is quenched directly from the finishing rolling temperature.
Direct Reduced Iron X75. IMDG Code, Classes, Packing and Segregation: DRI, regulated under IMSBC for bulk but referenced in IMDG segregation when Class 4.2 packaged forms apply.
Direct Reduced Iron (DRI) X1. Cargo Science, Commodities and Cargo Care: IMSBC Schedules A, B, C; reactive with water and air.
Direct Sound Salvage Award X60. Marine Salvage and Wreck Removal: Award expressed as a percentage of salved values rather than a lump sum.
Direct strength analysis B1. Naval Architecture: Finite-element check against IACS Common Structural Rules.
Direct to metal X45. Marine Paints, Coatings and Antifouling: Coating that may be applied without a primer to prepared steel, used in some industrial maintenance products.
Direct Towage Mode X137. Harbour Tugs, Towage Operators and Tug Builders: Operating mode in which the tug's bollard pull is applied in line with the towline.
Direct-coupled propulsion B2. Marine Engineering: Two-stroke engine directly coupled to propeller without gearbox.
Direct-to-Cell (Starlink) X68. Maritime Satcom and Telecommunications: SpaceX initiative to provide cellular service from low Earth orbit satellites, of emerging interest to maritime users.
Directemar X80. Maritime Search and Rescue Coordination: Directorate General of the Maritime Territory of Chile, exercising SAR authority within the Chilean SRR.
Direction Finder X80. Maritime Search and Rescue Coordination: Equipment used by SRUs to home on distress transmissions.
Direction Finding Antenna X109. Maritime Autonomous Surface Ships and MASS Code: A radio system used in some unmanned surface vessels to locate distress beacons during search and rescue support.
Direction of Wave Propagation D2. Hydrography, tides, waves, bathymetry and marine geology: Mean direction along which wave energy travels.
Directive (EU) 2016/1629 X33. Inland Navigation and Barge Operations: EU directive laying down technical requirements for inland waterway vessels, referencing ES-TRIN.
Directive (EU) 2017/2397 X33. Inland Navigation and Barge Operations: EU directive on the recognition of professional qualifications in inland navigation.
Directive 2005/44/EC X33. Inland Navigation and Barge Operations: EU directive on harmonized River Information Services on inland waterways.
Directive 2009/16/EC X66. Port State Control and Regional MOUs: EU directive transposing Paris MOU NIR into European law and providing the legal basis for banning orders.
Directive 2009/18/EC X163. Marine Accident Investigation Agencies and Landmark Inquiries: European Union directive establishing the fundamental principles governing the investigation of accidents in the maritime transport sector and implementing the IMO Casualty Investigation Code.
Directive 96/50/EC X33. Inland Navigation and Barge Operations: Former EU directive on mutual recognition of national boatmasters' certificates, repealed by 2017/2397.
Director General of Shipping India X121. Maritime Education, Academies and Universities: DGS in Mumbai, the Indian flag-state authority that approves Maritime Training Institutes (MTIs) under M.S. Notice frameworks.
Director of Marine (Hong Kong) X66. Port State Control and Regional MOUs: PSC authority for Hong Kong under Tokyo MOU.
Director of Marine Salvage X13. Marine Salvage and Wreck Removal: Senior salvor role overseeing on-scene execution and contract.
Director of National Intelligence (ODNI) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: A U.S. body whose Worldwide Threat Assessments inform Treasury designations of maritime networks.
Director-General A1. The IMO and the international regulatory framework: Head of UN specialized agencies; the IMO equivalent is the Secretary-General.
Diretoria de Portos e Costas (DPC) X163. Marine Accident Investigation Agencies and Landmark Inquiries: See Brazilian Navy Directorate of Ports and Coasts.
Direzione Generale per le Investigazioni Ferroviarie e Marittime (DIGIFEMA / DGISAR) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Italian Directorate-General within the Ministry of Infrastructure and Transport that performs marine accident investigations (formerly known under the DGISAR designation).
Dirty oil tank X19. Engine Room Watchkeeping and UMS Operations: Tank receiving sludge and dirty oil from engine spaces, separate from sludge tank.
Dirty Petroleum Product (DPP) X44. Shipping Indices, FFAs and Freight Markets: Tanker industry classification of crude and residual fuel cargoes corresponding to BDTI assessments.
Dirty Petroleum Products (DPP) X1. Cargo Science, Commodities and Cargo Care: Fuel oil, crude, slops.
DIS X7. Flag State, Port State Control and Detention Vocabulary: Danish International Ship Register, second register established 1988 permitting mixed-nationality crews.
Disability assessment X36. Shipboard Medical, Telemedicine and Seafarer Health: Glasgow Coma Scale (GCS) and pupillary response check in primary survey.
Disablement (Use of Force) E2. Naval, defence and maritime law enforcement: Calibrated force to stop a vessel without sinking.
Disaster Inquiry F1. Maritime History: Formal investigation tradition exemplified by the Titanic and Lusitania inquiries.
Disaster Recovery X48. Maritime Cybersecurity: Plans and procedures to restore IT services after major disruption.
Disbondment X45. Marine Paints, Coatings and Antifouling: Loss of adhesion between coating and substrate, often near coating defects.
Disbursement Account X86. Port Agency, Husbandry and Disbursement: Statement of port expenses presented by the agent.
Disbursement Audit X86. Port Agency, Husbandry and Disbursement: Review of agency disbursements by principal or independent firm.
Disbursement Funds Account X86. Port Agency, Husbandry and Disbursement: Bank account holding principal funds for port expenses.
Disbursement Variance Report X86. Port Agency, Husbandry and Disbursement: Comparison of estimated and final port costs item by item.
Disbursements X4. Marine Insurance, P&I and Claims: expenditure connected with the marine adventure; can be separately insured.
Disbursements Insurance X157. Marine Loss Adjusters, GA Practice, and Casualty Firms: Hull cover insuring increased value, freight, or other interests of the shipowner above the hull and machinery value.
Disbursements Warranty X4. Marine Insurance, P&I and Claims: ITC Hulls 1/10/83 clause 21 limiting the amount that may be insured on disbursements and similar interests.
Disc Anode X100. Marine Cathodic Protection and Anodes: An ICCP anode of circular flat geometry mounted flush with the hull or in a recessed well.
Disc Skimmer X126. Marine Oil Spill Response and OPRC Regimes: Oleophilic skimmer with rotating discs scraped by stationary wipers, exemplified by Lamor LRB and Elastec Mini-Max.
Disc stack X47. Marine Fuel Quality and ISO 8217: Series of conical separator discs in a centrifugal purifier creating thin layers for efficient phase separation.
Discard X87. Fishing Vessels and Fisheries Management: Catch returned to the sea, addressed under EU Common Fisheries Policy landing obligation Article 15.
Discard Ban (EU Landing Obligation) X87. Fishing Vessels and Fisheries Management: Requirement under Regulation 1380/2013 to land all catches of species subject to TACs.
Discards D4. Fisheries, aquaculture, blue economy and marine resources: Portion of catch returned to the sea, often dead.
Discharge X75. IMDG Code, Classes, Packing and Segregation: Operation of removing cargo from a CTU or vessel, subject to IMDG and CTU Code controls.
Discharge (Reg 1 Annex I) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: Any release however caused from a ship of substances regulated by MARPOL, including escape, disposal, spilling, leaking, pumping, emitting, or emptying.
Discharge Criteria A3. Marine environmental legislation: MARPOL and its annexes: Quantitative limits under each MARPOL annex.
Discharge Fitting X83. ISO Container Manufacturing and Leasing: Bottom or footvalve assembly on an ISO tank container for product discharge.
Discharge Head X63. Marine Auxiliary Machinery and Pumps: Pressure energy required by a pump expressed as a column height of pumped fluid.
Discharge List X46. Container Terminal Operations: The sequenced list of containers to be unloaded from a vessel, produced by the stowage planner and the TOS.
Discharge Monitoring and Control System X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: See ODMCS, the required system under Reg 31 of Annex I for tankers of 150 GT and above.
Discharge of Insurer X4. Marine Insurance, P&I and Claims: ending of the insurer's liability, for example on breach of warranty or on payment of total loss.
Discharge Operation Plan X86. Port Agency, Husbandry and Disbursement: Document showing planned discharge sequence, often agreed with terminal.
Discharge Operations X99. Marine Salvage Awards and SCOPIC: Removal of cargo or bunkers from the casualty to enable refloating or wreck removal.
Discharge pipeline X175. Port Engineering, Dredging, Breakwaters, and Quays: Floating, sinker, or shore pipeline that carries pumped slurry from a CSD or hopper dredger to the placement area.
Discharge Plan Review X5. Marine Surveying and Inspection: Verification of cargo discharge sequence against stress and stability.
Discharge port X6. Container, Intermodal and Trade Codes: Port at which a container is unloaded from the vessel.
Discharge Port Clause X51. Maritime Arbitration, Law and BIMCO Clauses: A voyage charter provision specifying the contractual port or range of discharge.
Discharge pressure X26. Reefer Containers and Cold Chain Logistics: High-side refrigerant pressure at compressor outlet.
Discharge Pumping X60. Marine Salvage and Wreck Removal: Removal of cargo or bunker into shore tanks, barges, or another vessel.
Discharge rate X56. LNG/LPG Carriers and IGC Code: Volumetric rate of cargo discharge during unloading, typically 10,000 to 14,000 cubic meters per hour at large LNG import terminals.
Discharge standard X18. Ballast Water, Biofouling and Antifouling: Numerical limit on viable organisms in ballast water at discharge, set by D-2 and similar regulations.
Discharge Survey X1. Cargo Science, Commodities and Cargo Care: Quantity and condition check at port of discharge.
Discharge Temperature X115. Marine Bunker and Cargo Surveying: Temperature of cargo measured at discharge, used in volume correction calculations and in heating-clause compliance checks.
Disciplinary procedure X21. STCW Certificates, Crewing and Seafarer Welfare: MLC Regulation 5.1.5 onboard complaint and disciplinary process.
Disclosed Owner X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The entity named on the bill of sale or registry transcript, distinct from beneficial owner under sanctions screening.
Disclosure X53. Marine Insurance, P&I and Hull Clauses: The pre-contract duty of the assured to disclose material circumstances to the underwriter, reformed in the UK by the Insurance Act 2015.
Disclosure (Arbitration) X51. Maritime Arbitration, Law and BIMCO Clauses: The procedural duty to produce documents relevant to issues in dispute, narrower than English court disclosure.
Disconnectable Turret X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Internal turret mooring designed to be released so the floater can sail off-station during cyclones.
Discontinuity X88. Marine Surface Preparation and Coatings Application: Pinhole, crack, or thin spot in a coating that exposes the substrate, detected by holiday testing per ASTM D5162 or G62.
Discount Curve X44. Shipping Indices, FFAs and Freight Markets: Forward FFA curve shape in which deferred contracts trade below the prompt assessment, often during cyclical peaks.
Discount-Tier Products Cap (USD 45/bbl) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The G7+ ceiling on Russian petroleum products that typically trade at a discount to crude, effective 5 February 2023.
Discovery X114. Maritime Arbitration and Shipping Law Firms: Procedural disclosure stage in arbitration governed by IBA Rules on Taking of Evidence in many shipping cases.
Discovery (US) X152. Maritime Arbitration and Dispute Resolution: Broader US procedural concept including depositions, interrogatories, and document production; the SMA Rules constrain discovery in arbitration.
Discovery Bay Ferry X132. High-Speed Craft, Hydrofoils and Ferry Operators: NWFB-affiliated Hong Kong operator running catamarans between Central Pier 3 and Discovery Bay on Lantau Island.
Discovery Period X117. Marine Insurance Markets, Captives and Reinsurance: The post-cancellation period during which losses occurring earlier may still be reported.
Discovery Princess X64. Cruise Industry Operators, Brands and Ships: Princess Cruises Royal-class ship delivered in 2022.
Discovery, HMS X39. Pre-1900 Maritime History: Royal Navy barque-rigged exploration vessel of 1789 that accompanied Vancouver to the Pacific Northwest.
Discovery, RRS F2. Maritime Culture, Heritage, Archaeology, Art and Museums: 1901 Antarctic vessel preserved at Dundee.
Discrepancy Report X86. Port Agency, Husbandry and Disbursement: Statement of differences between bill of lading and actual cargo, prepared with surveyors.
Discretionary Settlement X44. Shipping Indices, FFAs and Freight Markets: Clearing house authority to use alternative price determination methods when an index is not published on a given day.
Disembarkation X24. Cruise, Passenger Ship and Ferry Operations: Process of guests leaving the ship at the end of a cruise.
Disembarkation lee X32. Marine Pilotage and Pilot Operations: Lee provided by the ship for pilot boat coming alongside to recover the pilot.
Disengagement Phase X80. Maritime Search and Rescue Coordination: Termination phase of a SAR case after rescue or suspension.
Dishwasher (Hood Type) X120. Marine Catering, Provisions and Ship Chandlers: IMPA 174404, common Hobart AM900 or Winterhalter PT models in officer mess pantries.
Dishwasher Final Rinse X41. Cruise Ship Public Health and VSP/USPH: VSP requirement of 71 C (160 F) measured at the plate surface for high-temperature machines.
Dishwasher Wash Tank X41. Cruise Ship Public Health and VSP/USPH: First stage of a mechanical dishwasher operating with detergent at the temperature specified by the manufacturer.
Disinfectant Footbath X41. Cruise Ship Public Health and VSP/USPH: Tray of sanitizer historically used at galley entrances, now disfavored in modern VSP practice.
Disinfectant Liquid Corrosive NOS X75. IMDG Code, Classes, Packing and Segregation: UN 1903, Class 8.
Disko Bay X27. Polar Code, Ice Navigation and Polar Operations: Bay on the west coast of Greenland; calving ground for icebergs from Jakobshavn Glacier.
Dismantling Plan X28. Ship Recycling and End-of-Life: Sequence drawing showing the order of structural removal of the vessel.
Disney Adventure X164. Cruise Industry, Brands, Ship Classes, and Terminals: The fourth Wish class Disney Cruise Line ship under construction at Meyer Werft for delivery in 2025.
Disney Cruise Line X24. Cruise, Passenger Ship and Ferry Operations: Cruise brand of The Walt Disney Company operating Magic, Wonder, Dream, Fantasy, Wish, Treasure, and Adventure.
Disney Destiny X64. Cruise Industry Operators, Brands and Ships: Disney Cruise Line Triton-class ship scheduled for delivery in 2025.
Disney Dream X64. Cruise Industry Operators, Brands and Ships: Disney Cruise Line ship delivered in 2011.
Disney Fantasy X64. Cruise Industry Operators, Brands and Ships: Disney Cruise Line ship delivered in 2012.
Disney Magic X64. Cruise Industry Operators, Brands and Ships: First Disney Cruise Line ship delivered in 1998.
Disney Treasure X64. Cruise Industry Operators, Brands and Ships: Disney Cruise Line Triton-class ship delivered in 2024.
Disney Wish X24. Cruise, Passenger Ship and Ferry Operations: Lead ship of the Disney Wish class, delivered 2022.
Disney Wonder X64. Cruise Industry Operators, Brands and Ships: Disney Cruise Line ship delivered in 1999.
Disola M 4015 X61. Marine Lubricants and Cylinder Oils: Total Lubmarine 15 BN distillate-fuel diesel engine oil for medium-speed four-stroke engines.
Disola M 4020 X61. Marine Lubricants and Cylinder Oils: Total Lubmarine 20 BN distillate-fuel diesel engine oil for high-speed and medium-speed engines on marine gas oil.
Dispatch charge X32. Marine Pilotage and Pilot Operations: Pilotage fee covering pilot launch and dispatch costs separate from pilotage itself.
Dispatch Letter X86. Port Agency, Husbandry and Disbursement: Letter of authority from principal allowing the agent to release cargo.
Dispatch Money X53. Marine Insurance, P&I and Hull Clauses: A reward paid by the owner to the charterer for completing loading or discharge faster than allowed, distinct from demurrage.
Dispenser Cabinet X41. Cruise Ship Public Health and VSP/USPH: Wall unit holding paper towels and soap at every required handwash station.
Dispersant D3. Marine environmental science, pollution and conservation: Chemical applied to oil spills to break oil into smaller droplets.
Dispersant additive B2. Marine Engineering: Lube oil additive keeping soot in suspension.
Dispersant Application X60. Marine Salvage and Wreck Removal: Surfactant treatment of oil slicks to facilitate dispersion into the water column.
Dispersant Effectiveness Test X126. Marine Oil Spill Response and OPRC Regimes: Bench protocol such as Baffled Flask Test or Swirling Flask Test required for EPA Subpart J listing.
Dispersant Window of Opportunity X126. Marine Oil Spill Response and OPRC Regimes: Practical period (typically 24 to 72 hours) during which an oil retains low enough viscosity for chemical dispersion.
Dispersion Effectiveness X60. Marine Salvage and Wreck Removal: Quantitative measure of dispersant performance on a specific oil at a specific weathering state.
Dispersion Modeling D3. Marine environmental science, pollution and conservation: Simulation of pollutant transport in air or water.
Displacement (Delta) X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Mass or volume of water displaced by a ship; in the IACS UR A1 formula, the moulded displacement at summer load draft in cubic metres.
Displacement (Δ) B1. Naval Architecture: Mass of water displaced equal to vessel mass at floating equilibrium.
Displacement Calculation X155. Marine Surveying Practice and Cargo Inspection: The derivation of total vessel weight from observed mean draft via hydrostatic tables, after trim, list, hog/sag, and density corrections.
Displacement Mode X132. High-Speed Craft, Hydrofoils and Ferry Operators: Operating regime below hump speed where a craft is supported by buoyancy rather than dynamic lift.
Displacement Tonnage F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Total mass of water displaced by a vessel.
Displacement yacht X35. Yacht and Superyacht Industry: Yacht with a hull form that moves through the water rather than planing on top of it.
Displacement-length ratio B1. Naval Architecture: Δ/(0.01 L)^3 in long-ton/foot units.
Display Category X73. Marine Hydrography, Charting and ENC: The S-52 grouping of ENC features into Base, Standard, and Other display layers.
Display Pyrotechnic X75. IMDG Code, Classes, Packing and Segregation: UN 0335, Class 1.3G fireworks for display.
Disponent Owner A5. Maritime Law, private and commercial: Charterer who treats the vessel as if owner for sub-letting.
Disposable mine disposal vehicle X77. Naval Mine Warfare and Mine Countermeasures: A category of expendable ROV designed to be sacrificed when placing a shaped charge on a mine, exemplified by SeaFox C and K-Ster C.
Disposal area X124. Dredging Industry and Reclamation Contractors: Designated water or land site for placement of dredged material, licensed under the London Convention for marine disposal.
Disposal site C4. Ports, terminals and coastal/marine civil engineering: Dredged material disposal location.
Dispute Adjudication Board X114. Maritime Arbitration and Shipping Law Firms: Standing panel sometimes used in shipbuilding contracts as a precursor to arbitration.
Dispute Resolution Clause X51. Maritime Arbitration, Law and BIMCO Clauses: The contractual provision selecting forum, governing law, and procedure for resolving disputes.
Disputed Quantity X115. Marine Bunker and Cargo Surveying: Difference between supplier-claimed and surveyor-measured quantity, formalized by Letter of Protest when material.
Dissolved Inorganic Carbon (DIC) D1. Physical and chemical oceanography and marine meteorology: Sum of CO2, bicarbonate, and carbonate ions dissolved in seawater.
Dissolved Organic Carbon (DOC) D1. Physical and chemical oceanography and marine meteorology: Operationally defined fraction of organic carbon passing through a filter.
Dissolved Oxygen (DO) D1. Physical and chemical oceanography and marine meteorology: Concentration of O2 in seawater, vital for marine respiration.
Dissostichus eleginoides X87. Fishing Vessels and Fisheries Management: Patagonian toothfish, managed by CCAMLR and SEAFO with CCAMLR catch documentation.
Dissostichus mawsoni X87. Fishing Vessels and Fisheries Management: Antarctic toothfish, harvested under CCAMLR Conservation Measures in the Ross Sea region.
Distal Sample Point X41. Cruise Ship Public Health and VSP/USPH: Furthest tap from the potable production or bunker station where residual is measured for compliance.
Distance Apart Lengthwise X75. IMDG Code, Classes, Packing and Segregation: Segregation requirement in IMDG 7.2.4 for on deck container stowage measured as bay separation.
Distance Apart Transversely X75. IMDG Code, Classes, Packing and Segregation: Segregation distance across rows in on deck stowage, applied by container vessel software.
Distance Calculator X101. Vessel Brokerage Software and Chartering Platforms: Standard module inside Veson IMOS computing port-to-port distances using the BP Marine, AtoBviaC, or proprietary distance tables.
Distance Learning Maritime Programs F3. Seafaring Life, Education, Professions and Institutions: Lloyd's Maritime Academy and others.
Distance Learning OOW Programs X160. Maritime Academies, Universities, and STCW Certification: Blended or remote MET delivery modes accepted by some flag states such as the UK MCA HND in nautical science via distance partners.
Distance Log F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Instrument recording distance run through the water.
Distance-controlled vehicle X77. Naval Mine Warfare and Mine Countermeasures: An older term for a remotely operated mine disposal vehicle linked by fiber-optic or copper cable.
Distant Water Fishing (DWF) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Fishing outside a fleet's home EEZ, dominated by China (around 2,700 vessels), Taiwan, Spain, South Korea and Japan.
Distant Water Fishing Fleet (DWF) X87. Fishing Vessels and Fisheries Management: Vessels operating outside their flag state EEZ, including the Chinese, Spanish, Korean, Japanese, and Taiwanese fleets.
Distillate Cooler X41. Cruise Ship Public Health and VSP/USPH: Heat exchanger downstream of evaporators that conditions produced fresh water before potable use.
Distillate fuel X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Fraction produced by atmospheric or vacuum distillation, including DMA, DMB, DMX, and DMZ grades.
Distillate Marine Fuel X115. Marine Bunker and Cargo Surveying: Lighter, refinery-distilled marine fuel covered by ISO 8217 DMA, DMZ, DMB, and DMX grades.
Distillate Pump X63. Marine Auxiliary Machinery and Pumps: Pump removing produced fresh water from the evaporator and delivering it to storage.
Distillates X1. Cargo Science, Commodities and Cargo Care: Mid-range refined products (gasoil, jet, kerosene).
Distillation curve X47. Marine Fuel Quality and ISO 8217: Plot of temperature against recovered volume during ASTM D86 distillation of a fuel sample.
Distortion control B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Welding sequence/jigs to limit deformation.
Distortion, welding X58. Shipbuilding Yards and Construction: Geometric deviation in a welded structure caused by thermal contraction.
Distress X99. Marine Salvage Awards and SCOPIC: Condition of grave and imminent danger to a vessel, cargo, or persons that justifies salvage.
Distress alert X16. Nautical Science, Navigation and COLREGs: GMDSS message indicating grave and imminent danger.
Distress Frequency X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Internationally protected frequency for distress traffic; 156.8 MHz, 2182 kHz, 121.5 MHz aviation, 406 MHz Cospas-Sarsat.
Distress message obligation X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: SOLAS V/33 requires masters receiving a distress signal to proceed with all speed to render assistance.
Distress Phase X80. Maritime Search and Rescue Coordination: IAMSAR-defined emergency phase indicating grave and imminent danger.
Distress Priority X80. Maritime Search and Rescue Coordination: Highest priority traffic on GMDSS networks.
Distress Relay X80. Maritime Search and Rescue Coordination: Retransmission of a distress alert by a third party.
Distress sequence (polar) X27. Polar Code, Ice Navigation and Polar Operations: Emergency communication considering reduced GMDSS coverage above 70 degrees N.
Distress signal X3. Ship Handling, Seamanship and Deck Vocabulary: Signal indicating grave and imminent danger.
Distress signal pilot X32. Marine Pilotage and Pilot Operations: Procedure for emergency pilot disembarkation in deteriorating weather.
Distress signals X16. Nautical Science, Navigation and COLREGs: Signals listed in COLREGs Annex IV indicating distress and need of assistance.
Distress Traffic X80. Maritime Search and Rescue Coordination: All communications related to the immediate assistance required by a vessel in distress.
Distressed Debt Fund X49. Ship Finance, Leasing and Maritime Capital Markets: Alternative investor purchasing shipping loans or bonds at a discount.
Distressed Seafarers' Fund X154. Maritime Welfare, Seafarer Charities, and MLC Rights: ITF Seafarers' Trust grant stream for emergency cash assistance.
Distributed Acoustic Sensing (DAS) E3. Technology, digitalization and smart shipping: Fiber-based acoustic monitoring of subsea cables.
Distributed Compute Architecture X109. Maritime Autonomous Surface Ships and MASS Code: A MASS design pattern that splits perception, planning, and control across multiple cooperating compute nodes.
Distributed Control System X169. Container Terminal Cranes, Yard Equipment, and Lashing: Crane control architecture with multiple networked controllers handling hoist, trolley, gantry, and auxiliary functions over a fieldbus.
Distribution Board X67. Marine Electrical Systems and Shore Power: Subordinate panel that splits power from a main switchboard feeder into multiple smaller branch circuits.
District pilot X32. Marine Pilotage and Pilot Operations: Pilot whose license is confined to a specified pilotage district under national legislation.
District Seven X130. National Coast Guards and Cutter Fleets: USCG Miami-based district covering Florida, Caribbean and West Indies, leads counter-narcotics operations.
Disturbance Footprint X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: MSP metric quantifying the seabed area temporarily or permanently altered by cable and pipeline installation.
Diurnal Cycle D1. Physical and chemical oceanography and marine meteorology: Variation occurring on a daily timescale, such as sea surface temperature heating.
Diurnal Inequality D2. Hydrography, tides, waves, bathymetry and marine geology: Difference in heights of successive high or low tides on the same day.
Diurnal Tide D2. Hydrography, tides, waves, bathymetry and marine geology: Tide with one high and one low water per tidal day.
Diurnal Tide Gauge D5. Coastal processes, sea-level, cryosphere and ocean observation science: Tide gauge resolving diurnal variations.
Diuron X165. Marine Coatings, Antifouling, and Hull Husbandry: Phenylurea herbicide used historically as an antifouling booster, banned in EU biocidal product applications since 2008.
Dive Support Vessel (DSV) B5. Ship Types and Individual Vessels: Saturation diving support.
Diver (Tariff Category) X99. Marine Salvage Awards and SCOPIC: SCOPIC personnel category for commercial divers engaged in underwater inspection, patching, and rigging.
Diver Held Suction X60. Marine Salvage and Wreck Removal: Hand operated suction tool used by divers for sediment removal around grounded vessels.
Diver Hull Cleaning X96. Hull Integrity Monitoring and Strain Gauges: Underwater cleaning of hull surfaces by trained divers using brushes or rotary tools.
Divergence (wind) X16. Nautical Science, Navigation and COLREGs: Net outflow of air, associated with subsidence and high pressure.
Diverless Connection X14. Offshore Oil and Gas Marine Operations: Subsea connection methods using ROV interfaces below diver depth.
Diversion Capability X80. Maritime Search and Rescue Coordination: A merchant ship's ability to alter course to render assistance.
Diversion channel C4. Ports, terminals and coastal/marine civil engineering: Engineered channel diverting flow.
Diversion Expenses X53. Marine Insurance, P&I and Hull Clauses: Costs incurred when a vessel is diverted from her course due to an insured peril, sometimes covered as sue and labor.
Diversion plan (Polar Code) X27. Polar Code, Ice Navigation and Polar Operations: Voyage planning element to account for limited places of refuge.
Diversion Request X80. Maritime Search and Rescue Coordination: Formal SMC request to a ship to leave its track and proceed to a casualty.
Diversity in Maritime Charter X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Maritime UK initiative welfare bodies and unions support to broaden seafarer recruitment.
Divert Valve X69. EGCS Scrubbers, SCR and Marine Air Emissions: High-temperature valve directing exhaust to scrubber or bypass paths.
Diverter X14. Offshore Oil and Gas Marine Operations: Low pressure flow diversion system above the BOP on a riser.
Diverter Valve X41. Cruise Ship Public Health and VSP/USPH: Three-way valve in evaporator output piping that routes off-spec water away from potable tanks.
Diverting Valve X63. Marine Auxiliary Machinery and Pumps: Three-way valve that redirects OWS effluent back to the bilge holding tank when oil content exceeds limits.
Dividers X16. Nautical Science, Navigation and COLREGs: Drafting instrument with two metal points for measuring distance on a chart.
Diving at Work Regulations 1997 X82. Saturation Diving and Offshore Diving Operations: UK statutory instrument governing commercial diving.
Diving Bell X13. Marine Salvage and Wreck Removal: Pressurised chamber for transferring saturation divers to underwater work sites.
Diving Doctor X82. Saturation Diving and Offshore Diving Operations: Physician trained in diving and hyperbaric medicine.
Diving Inspection Coordination X86. Port Agency, Husbandry and Disbursement: Arrangement of underwater hull inspection through approved diving firms.
Diving Medical Examiner X82. Saturation Diving and Offshore Diving Operations: Doctor certified to examine divers for fitness to dive.
Diving Medical Technician X82. Saturation Diving and Offshore Diving Operations: Onshore or offshore technician trained in hyperbaric first aid and chamber operation.
Diving Operations X108. Marine Insurance and P&I Clubs: A specialty activity excluded or specially conditioned in P&I cover, addressed under Offshore Exclusion Clauses.
Diving Operations Manual X82. Saturation Diving and Offshore Diving Operations: Vessel-specific document defining procedures for the spread.
Diving Personnel X82. Saturation Diving and Offshore Diving Operations: Collective term for divers, supervisors, technicians, and support crew.
Diving Plant X82. Saturation Diving and Offshore Diving Operations: Equipment forming a diving system, subject to certification under IMCA D 045.
Diving Project Plan X82. Saturation Diving and Offshore Diving Operations: Pre-mobilization document describing scope, hazards, and controls.
Diving Spread X82. Saturation Diving and Offshore Diving Operations: Complete assemblage of equipment for an offshore diving operation.
Diving Superintendent X82. Saturation Diving and Offshore Diving Operations: Senior shoreside or vessel-based manager responsible for diving operations.
Diving Supervisor X82. Saturation Diving and Offshore Diving Operations: Person in direct charge of a single dive at the control panel.
Diving Support Vessel X82. Saturation Diving and Offshore Diving Operations: Purpose-built vessel housing a saturation system and dynamic positioning.
Diving Support Vessel (DSV) E4. Cruise, offshore energy and auxiliary/specialised fleets: Vessel with saturation-diving capability.
Diving Survey X43. Marine Surveying and Warranty Surveying: An underwater inspection by certified commercial divers, with or without video, to assess hull condition, damage, or fouling.
Division 1.1 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Substances and articles that have a mass explosion hazard, in which virtually the entire load is affected almost instantaneously.
Division 1.2 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Substances and articles that have a projection hazard but not a mass explosion hazard.
Division 1.3 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Substances and articles that have a fire hazard and either a minor blast hazard or a minor projection hazard.
Division 1.4 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Substances and articles that present no significant hazard; effects are largely confined to the package, with 1.4S permitted without further restriction.
Division 1.5 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Very insensitive substances that have a mass explosion hazard but are so insensitive that there is very little probability of initiation, e.g., UN 0331 blasting agent type B.
Division 1.6 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Extremely insensitive articles which do not have a mass explosion hazard, containing only extremely insensitive detonating substances.
Dixilyn-Field X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Historic drilling contractor whose semisubmersibles were absorbed into later major contractor fleets.
Djibouti Code of Conduct X22. Piracy, Maritime Security and Armed Protection: 2009 IMO instrument on cooperation against piracy in the western Indian Ocean and Gulf of Aden.