Glossary

Maritime glossary, terms beginning with D (page 4)

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

Showing 250 of 2401 terms (page 4 of 10).

Delegation X142. Classification Societies and Class Notations: Authority granted by flag State to a Recognized Organization.
Deletion certificate X7. Flag State, Port State Control and Detention Vocabulary: Document issued by the previous flag State confirming the ship has been removed from its register, required for re-registration elsewhere.
Deletion from Register X118. Ship Recycling Yards, Beaches and Regulation: Removal of the ship from the flag-state registry after recycling, evidenced by a certificate of deletion sent to the IMO via the GISIS Ship database.
Delft Exhaust Cleaning X69. EGCS Scrubbers, SCR and Marine Air Emissions: Reference to early Dutch development of marine EGCS technology in the Netherlands.
Delft3D D5. Coastal processes, sea-level, cryosphere and ocean observation science: Open-source modeling suite for hydrodynamics, morphology, and water quality.
DELFTship X54. Naval Architecture Software and IACS Rules: Hull surface and hydrostatics modeling software derived from FREE!ship and developed by DELFTship BV.
Delisting X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The removal of a person from a sanctions list following successful petition (OFAC Reconsideration Petition, EU re-listing review, OFSI specified-person review).
Delivered at place C3. Logistics, freight forwarding and multimodal trade: DAP, Incoterm 2020.
Delivered at place unloaded C3. Logistics, freight forwarding and multimodal trade: DPU, Incoterm 2020.
Delivered Bunker Price X72. Bunkering Hubs and Bunker Suppliers: Quoted price including barge delivery alongside the receiving vessel as distinct from ex wharf.
Delivered density at 15 C X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Mass per unit volume at the reference temperature, reported on the COQ.
Delivered duty paid C3. Logistics, freight forwarding and multimodal trade: DDP, Incoterm 2020.
Delivered power X19. Engine Room Watchkeeping and UMS Operations: PD, propeller shaft power delivered to the propeller hub.
Delivered power PD X38. Propellers, Stern Gear and Shaft Lines: Power delivered to the propeller at the propeller plane, equal to QPD multiplied by 2 pi n.
Delivered Quantity X115. Marine Bunker and Cargo Surveying: Final agreed quantity of bunker or cargo transferred, recorded on the delivery note after surveyor reconciliation.
Delivery X17. Chartering, Shipbroking and Freight Trading: Handover of the vessel to the time or bareboat charterer at the agreed place and condition.
Delivery Alongside X29. Ship Sale and Purchase, Management Contracts and Valuation: Physical handover with vessel berthed at agreed terminal.
Delivery Authority (Submarine Delivery Agency) X91. Submarines and Submarine Cable Systems: UK Ministry of Defence agency responsible for procuring and supporting British submarines.
Delivery captain X35. Yacht and Superyacht Industry: Freelance master engaged to move a yacht between locations on a one-off basis.
Delivery clause C1. Commercial shipping, chartering, economics and finance: Charter clause governing the place and condition of delivery.
Delivery date X58. Shipbuilding Yards and Construction: Contract date by which a newbuild must be delivered, governing yard liquidated damages.
Delivery Date Financing X49. Ship Finance, Leasing and Maritime Capital Markets: Loan that funds the final yard installment at vessel delivery.
Delivery Date, Demolition X50. Ship Recycling, Demolition and Hong Kong Convention: The contractually defined date and place at which the cash buyer or yard takes possession of the vessel for recycling.
Delivery dock X58. Shipbuilding Yards and Construction: Wet basin at a yard where vessels are completed and handed over.
Delivery DWS X29. Ship Sale and Purchase, Management Contracts and Valuation: Dropping outward sea pilot, delivery on departure from port.
Delivery Note X115. Marine Bunker and Cargo Surveying: Generic term for a bunker or cargo document evidencing transfer of product from supplier to receiver.
Delivery Note (Chandler) X120. Marine Catering, Provisions and Ship Chandlers: Stamped triplicate document, with one copy each for chandler, vessel, and agent.
Delivery Notice X29. Ship Sale and Purchase, Management Contracts and Valuation: Sellers' formal advice of expected delivery date and place.
Delivery order X15. Ports, Terminals and Stevedoring: D/O, document authorizing release of cargo to the consignee.
Delivery Port X28. Ship Recycling and End-of-Life: Location where the ship is handed over from seller to cash buyer or recycler.
Delivery protocol X58. Shipbuilding Yards and Construction: Document signed by yard and owner recording successful delivery and exchange of ownership.
Delivery Range X29. Ship Sale and Purchase, Management Contracts and Valuation: Geographic window allowed for tendering NOR.
Delivery Survey X5. Marine Surveying and Inspection: Condition survey at vessel delivery under sale or charter contract.
Delivery trip X35. Yacht and Superyacht Industry: Repositioning passage of a yacht between cruising grounds, often with a reduced crew.
Delivery Vessel Window X104. Project Cargo Forwarders and Heavy Transport: Berthing slot reserved at a project site for arrival of a heavy lift vessel.
Delivery voyage X125. Superyacht Industry, Builders and Brokers: The repositioning passage from builder to owner, typically with reduced manning.
Delta Anchor X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: One-piece plough-type HHP anchor of triangular shape developed by Vryhof for merchant and small craft use.
Delta Connection X67. Marine Electrical Systems and Shore Power: Three-phase winding configuration with no neutral, common in marine motors.
Delta Flag F5. The Reference Layer: Glossary, Units, Signals and Information Sources: International Code of Signals letter D, meaning "Keep clear of me; I am maneuvering with difficulty."
Delta Marine X35. Yacht and Superyacht Industry: US custom yacht builder in Seattle, Washington.
Delta-T X26. Reefer Containers and Cold Chain Logistics: Temperature difference between supply and return air; indicator of cargo heat load and airflow.
Deltares D5. Coastal processes, sea-level, cryosphere and ocean observation science: Dutch institute developing tools such as Delft3D for coastal modeling.
Deluge System X31. Helicopter Operations on Ships: Fixed foam fire-fighting system delivering AFFF at 6 L/min/m2 across helideck.
DEM (Digital Elevation Model) D5. Coastal processes, sea-level, cryosphere and ocean observation science: Gridded representation of surface topography.
Demag CC 2800 X104. Project Cargo Forwarders and Heavy Transport: Crawler crane in the 600 tonne class used for power plant and refinery work.
Demag CC 6800 X104. Project Cargo Forwarders and Heavy Transport: Crawler crane in the 1,250 tonne class, also marketed under the Terex brand.
Demag CC 8800-1 X104. Project Cargo Forwarders and Heavy Transport: Crawler crane in the 1,600 tonne class, the basis of the Twin variant.
Demag TC 3800 X104. Project Cargo Forwarders and Heavy Transport: Truck mounted lattice boom crane in the 650 tonne class.
Demagnetization range X77. Naval Mine Warfare and Mine Countermeasures: A shore-supported facility that measures and corrects the static magnetic signature of warships.
Demand Guarantee X49. Ship Finance, Leasing and Maritime Capital Markets: Independent guarantee payable on first demand, used by refund guarantors in newbuilding contracts.
Demand pump X19. Engine Room Watchkeeping and UMS Operations: Pump starting automatically on pressure drop in hydrophore or fuel system.
Demand-side measure X34. Decarbonization, Alternative Fuels and Carbon Pricing: Reduction of energy demand on board (speed, hull, propeller) before fuel switching.
DEME X42. Offshore Wind Installation and Cable Lay: Belgian marine contractor with subsidiaries including DEME Offshore active in foundation and turbine installation.
DEME Concessions X123. Offshore Wind Installation Vessels and Operators: DEME subsidiary developing Rentel and SeaMade offshore wind projects in Belgian North Sea.
DEME Group X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Belgian dredging and offshore contractor whose subsea cable arm DEME Offshore installs inter-array and export cables.
DEME Group Innovation Forum X119. Maritime Conferences, Trade Shows and Awards: Annual dredging and offshore wind technology day at DEME headquarters in Antwerp.
DEME Offshore X105. Offshore Wind Farm Installation and Vessels: Offshore renewables subsidiary of DEME operating WTIVs including Innovation, Apollo, Sea Installer, Sea Challenger, and Orion.
DEME Subsea X59. Offshore Wind O&M, CTVs and SOVs: Subsea services arm of the DEME Group offering ROV survey and cable burial assessment to wind farms.
Demersal X10. Marine Biology, Fisheries and Oceanography: Living near, but not strictly on, the seabed.
Demersal Fish D4. Fisheries, aquaculture, blue economy and marine resources: Fish living on or near the seabed.
Demersal Habitat Disturbance D3. Marine environmental science, pollution and conservation: Alteration of seabed habitat by bottom contact gear.
Demersal Longliner X87. Fishing Vessels and Fisheries Management: Vessel deploying a bottom anchored mainline with baited hooks for groundfish, prominent in Norway and Iceland.
Demersal Species X87. Fishing Vessels and Fisheries Management: Fish living on or near the seabed such as cod, haddock, hake, and flatfish.
Demersal Trawl X87. Fishing Vessels and Fisheries Management: Bottom trawl designed for groundfish, usually rigged with rockhopper, bobbin, or rubber disc ground gear.
Demi-Culverin X39. Pre-1900 Maritime History: A medium long-range naval gun of the sixteenth and seventeenth centuries.
Demilitarized Zone X48. Maritime Cybersecurity: Network segment that brokers traffic between untrusted external networks and internal shipboard systems.
Demilitarized Zone (DMZ) E1. Maritime security, geopolitics and risk: Network segment separating IT and OT systems on board.
Demineralized Water X69. EGCS Scrubbers, SCR and Marine Air Emissions: Treated water used as makeup in closed-loop scrubbers to limit scale formation.
Demineralized Water Wash X113. Drydock and Ship Repair Yards: Pre-coating freshwater rinse of blasted steel to reduce soluble salt contamination below specified ppm thresholds.
Demineralizer X19. Engine Room Watchkeeping and UMS Operations: Water treatment unit removing dissolved salts for boiler makeup.
Demise charter C1. Commercial shipping, chartering, economics and finance: Bareboat charter.
Demise Charter Registration X98. Ship Registries and Flag States: Synonym for bareboat charter registration under a second flag.
Demise Charter Survey X43. Marine Surveying and Warranty Surveying: See bareboat charter survey, an inspection at the start or end of a demise charter to record full physical and operational condition.
Demise Charterer X99. Marine Salvage Awards and SCOPIC: See Bareboat Charter Owner; party assuming operational and salvage liability for the vessel.
Demise Clause A5. Maritime Law, private and commercial: Bill of lading provision identifying the contracting carrier (relevant to The Berkshire).
Demister X69. EGCS Scrubbers, SCR and Marine Air Emissions: Internal device that removes entrained droplets from the scrubber exit gas.
Demobilisation X141. Marine Salvage Industry and Wreck Removal Contractors: Withdrawal of salvage spread from casualty site, the final claim line on most contracts.
Demobilization X82. Saturation Diving and Offshore Diving Operations: Removal of a diving spread from a vessel after the project.
Demodulator X68. Maritime Satcom and Telecommunications: Equipment that extracts the original information signal from a modulated satellite carrier.
DEMOLISHCON X161. Shipbroking, Freight Derivatives, and Baltic Indices: BIMCO 2012 standard demolition sale form used in cash buyer transactions of vessels for recycling.
Demolition X125. Superyacht Industry, Builders and Brokers: Final phase of a yacht's life, usually at Aliaga or Alang scrapyards under Hong Kong Convention rules.
Demolition Broker X28. Ship Recycling and End-of-Life: Intermediary arranging sale of vessels between owners and cash buyers.
Demolition Cash Buyer X50. Ship Recycling, Demolition and Hong Kong Convention: A specialist intermediary that purchases tonnage for recycling resale, including GMS, Wirana Shipping (Singapore), Best Oasis (Mumbai), Lotus Shipping (Mumbai), Star Asia (Hong Kong), Sea Trade…
Demolition lightweight (LDT) X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: The light displacement tonnage figure used to price scrap value, expressing the steel weight of an empty ship.
Demolition Price (USD/LDT) X118. Ship Recycling Yards, Beaches and Regulation: Headline market price paid per light displacement ton, reported weekly by GMS, Clarksons, and Lloyd's List Intelligence.
Demolition Sale X28. Ship Recycling and End-of-Life: Transaction in which a ship is sold for the purpose of recycling.
Demolition Sale Memorandum of Agreement X50. Ship Recycling, Demolition and Hong Kong Convention: The standard form contract used in end-of-life sales, typically based on the BIMCO Recyclecon or Demolishcon templates.
Demolition Tonnage Statistics X50. Ship Recycling, Demolition and Hong Kong Convention: The annual reporting by IHS Markit, Clarksons, and NGO Shipbreaking Platform of gross tonnage and LDT broken globally.
Demolition Value X44. Shipping Indices, FFAs and Freight Markets: Scrap price input that influences long-dated FFA pricing through expectations of fleet supply.
Demonstration array X57. Ocean Energy Beyond Wind: Small group of marine energy devices deployed to validate operations and maintenance before full commercial buildout.
Demonstration Project D6. Decarbonization, emissions and alternative fuels: Pilot project for new fuels or technologies.
Demonstration Voyage X109. Maritime Autonomous Surface Ships and MASS Code: A planned trial passage performed under controlled conditions to demonstrate a MASS capability to regulators and stakeholders.
Demonstrator X42. Offshore Wind Installation and Cable Lay: Small scale pre-commercial offshore wind project intended to validate technology such as Hywind Demo or WindFloat 1.
Demopolis Lock X103. US Inland Waterway Towing and Barge: A lock on the Black Warrior-Tombigbee Waterway in Alabama.
Demountable propeller blade X38. Propellers, Stern Gear and Shaft Lines: Bolted bronze blade arrangement on a separate hub, used on CPPs and some ice-class FPPs.
Demtas Gemi Sokum X118. Ship Recycling Yards, Beaches and Regulation: Aliaga ship recycling facility EU-listed since the early EU SRR rounds.
Demurrage A5. Maritime Law, private and commercial: Liquidated damages for detention of ship beyond laytime.
Demurrage and detention tariffs C3. Logistics, freight forwarding and multimodal trade: Carrier published D&D tariffs.
Demurrage Calculation X5. Marine Surveying and Inspection: Time calculation supported by statement of facts and surveyor logs.
Demurrage claim arbitration X152. Maritime Arbitration and Dispute Resolution: Dispute over freight market liquidated damages for delay beyond laytime, by far the highest volume claim type in LMAA references.
Demurrage Counter Notice X86. Port Agency, Husbandry and Disbursement: Statement countering demurrage claims, supported by Statement of Facts.
Demurrage Manager X101. Vessel Brokerage Software and Chartering Platforms: Veson IMOS module that automates laytime statements, time bars, and claim handling for tanker and dry bulk voyages.
Demurrage Risk Assessment X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The commercial risk a charterer accepts when accepting a vessel with conditional vetting that may delay operations.
Denatured Alcohol X1. Cargo Science, Commodities and Cargo Care: Ethanol with additives; flammable liquid Class 3.
Dengue fever X36. Shipboard Medical, Telemedicine and Seafarer Health: Mosquito-borne viral illness encountered in tropical port calls; supportive shipboard care, MEDEVAC for severe cases.
DenGyo X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Japanese contractor active in cable landing civil works around East Asia.
Denia X85. Ferries, Ro-Pax Operators and Routes: Spanish Mediterranean port and Balearia's home base serving Ibiza and Palma.
Denial of Cover X4. Marine Insurance, P&I and Claims: insurer's refusal to indemnify on grounds of policy terms, breach, or non-disclosure.
Denial of Service X48. Maritime Cybersecurity: Attack that degrades or interrupts the availability of a shipboard or shore service.
Denial of Service (DoS) X139. Maritime Cybersecurity, OT Threats and Standards: Attack degrading availability; the 2017 NotPetya wiper functioned as a destructive DoS against Maersk's global network.
Denial of Service (DoS) Attack E1. Maritime security, geopolitics and risk: Flooding attack disrupting shipboard or port services.
Denison Yachting X35. Yacht and Superyacht Industry: US brokerage headquartered in Fort Lauderdale, founded by the Denison family.
Denmark X7. Flag State, Port State Control and Detention Vocabulary: EU traditional and second register flag, see DIS and DAS.
Denmark PSC X66. Port State Control and Regional MOUs: Paris MOU member State; PSC conducted by Danish Maritime Authority.
Denmark Strait X27. Polar Code, Ice Navigation and Polar Operations: Strait between Greenland and Iceland, southern boundary of the Polar Code Arctic area.
Densified CO2 X57. Ocean Energy Beyond Wind: CO2 transported as a dense liquid at elevated pressure, the form used in dedicated CO2 carriers and most subsea pipelines.
Density X15. Ports, Terminals and Stevedoring: cargo mass per unit volume, governs stowage factor.
Density Altitude X31. Helicopter Operations on Ships: Pressure altitude corrected for non-standard temperature, affecting helicopter performance.
Density anomaly (sigma-t) X10. Marine Biology, Fisheries and Oceanography: Seawater density at one atmosphere minus 1,000 kg/m3, in kg/m3.
Density at 15 C X1. Cargo Science, Commodities and Cargo Care: Reference density used in petroleum volume corrections.
Density at 15 C in Air X5. Marine Surveying and Inspection: Petroleum density used for invoice quantity calculations.
Density at 15 C in Vacuum X5. Marine Surveying and Inspection: Petroleum density reported by laboratories for reference.
Density at 15 deg C X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: ISO 8217 parameter measured per ASTM D4052 or ISO 12185, capped at 991 kg per cubic meter for RMG 380.
Density at 15 Degrees X72. Bunkering Hubs and Bunker Suppliers: Mandatory parameter on the BDN expressing fuel density at fifteen degrees Celsius in kilograms per cubic meter.
Density at 15 degrees C X115. Marine Bunker and Cargo Surveying: Reference density of marine fuels expressed in kg/m3, determined per ISO 12185 and used in mass-to-volume conversion.
Density Calculation X20. LNG Operations and Custody Transfer: LNG density derived from composition and temperature using Klosek-McKinley revised (KMR) or Peng-Robinson EoS per GIIGNL.
Density Correction X155. Marine Surveying Practice and Cargo Inspection: The adjustment to displacement when the dock water density differs from the standard 1.025 t per cubic meter used to construct hydrostatic tables.
Density Driven Circulation D1. Physical and chemical oceanography and marine meteorology: Flow caused by horizontal density gradients, fundamental to thermohaline circulation.
Density LNG X56. LNG/LPG Carriers and IGC Code: Liquid density used in CTS calculation, typically near 430 to 470 kilograms per cubic meter depending on cargo composition.
Density of Liquid Ammonia X140. Ammonia as Marine Fuel and Hydrogen Shipping: 682 kg/m3 at minus 33 deg C, lighter than water but denser than LNG.
Density Survey X43. Marine Surveying and Warranty Surveying: A determination of dock water density used in adjusting draft survey calculations for accurate cargo quantity determination.
Dental kit (emergency) X36. Shipboard Medical, Telemedicine and Seafarer Health: Cavit temporary filling material, oil of cloves (eugenol), forceps for shipboard dental emergencies.
Dentons X114. Maritime Arbitration and Shipping Law Firms: International firm with shipping and maritime practice across multiple jurisdictions.
Department for Energy Security and Net Zero X57. Ocean Energy Beyond Wind: UK government department responsible for the CCS cluster sequencing and the Contracts for Difference scheme that supports tidal stream.
Department of Marine Engineering Newcastle University X121. Maritime Education, Academies and Universities: Within the School of Engineering, runs the BEng and MEng Marine Engineering accredited by IMarEST and RINA.
Department of Merchant Shipping Cyprus X98. Ship Registries and Flag States: Cypriot authority within the Ministry of Transport administering the Cyprus Ship Registry.
Department of Transportation X75. IMDG Code, Classes, Packing and Segregation: DOT, US authority that issues special permits and approvals harmonized with IMDG.
Departure X3. Ship Handling, Seamanship and Deck Vocabulary: Last fix taken on leaving port; east-west distance run.
Departure (dep) B3. Nautical Science: Easting in plane sailing.
Departure (navigation) X16. Nautical Science, Navigation and COLREGs: Distance in nautical miles measured east or west along a parallel.
Departure Condition X5. Marine Surveying and Inspection: Vessel state at departure including drafts, cargo, fuel, and stability.
Departure Condition Survey X155. Marine Surveying Practice and Cargo Inspection: A condition record taken just before sailing, often combined with an on-hire survey at the load port.
Departure Conditions X86. Port Agency, Husbandry and Disbursement: Recorded vessel state on sailing including draft, ROB, and crew numbers.
Departure draft X15. Ports, Terminals and Stevedoring: vessel draft after loading, declared on sailing.
Departure Draft Survey X86. Port Agency, Husbandry and Disbursement: Final draft survey after loading or discharge.
Departure Formalities X86. Port Agency, Husbandry and Disbursement: Outbound customs, immigration, and port clearance, completed by the agent.
Departure inspection X12. Maritime Casualties and Investigation: Pre-sailing check whose omission is repeatedly cited in groundings.
Departure pilot X32. Marine Pilotage and Pilot Operations: Pilot taking the vessel from the berth to the seaward pilot station.
Departure Survey X104. Project Cargo Forwarders and Heavy Transport: Inspection at origin confirming the project unit and securing arrangements before sailing.
Departure window X59. Offshore Wind O&M, CTVs and SOVs: Period each morning during which a CTV may sail to meet the technician shift start at the turbines.
DEPCC Winch X79. Tugs and Towage Industry: Markey Machinery double-drum electric escort winch series fitted to escort tugs.
Depleted gas field X57. Ocean Energy Beyond Wind: Former hydrocarbon reservoir reused for CO2 storage, as in the Porthos and Aramis projects in the Dutch North Sea.
Depleted Stock D4. Fisheries, aquaculture, blue economy and marine resources: Stock with biomass well below sustainable levels.
Depleted Uranium X75. IMDG Code, Classes, Packing and Segregation: Class 7 radioactive material with low specific activity, regulated under IMDG 2.7.
Depolarization X100. Marine Cathodic Protection and Anodes: The decay of cathodic polarization once protective current is interrupted, used in instant-off measurements.
DePool Mutual X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Niche P&I provider, fixed premium.
Deposit C1. Commercial shipping, chartering, economics and finance: Down payment under a memorandum of agreement, typically 10 percent.
Deposit Account X29. Ship Sale and Purchase, Management Contracts and Valuation: Joint account, dual signature, holding the buyers' deposit.
Deposit control X61. Marine Lubricants and Cylinder Oils: Function of detergent and dispersant additives that limit lacquer and carbon buildup on engine surfaces.
Deposit Feeders D3. Marine environmental science, pollution and conservation: Organisms feeding on sediment-bound organic matter.
Deposit Premium X4. Marine Insurance, P&I and Claims: provisional premium based on estimated exposure, adjusted at year end.
Deposits X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Combustion residue and ash accumulation on piston crown, ring grooves, and exhaust valve seats indicating fuel quality and lubrication issues.
Depot X6. Container, Intermodal and Trade Codes: Inland facility for storage, maintenance and repair of empty containers.
Depot agreement X122. Submarine Cable Laying, Repair Vessels and Operators: ICPC-style standard contract under which a cable owner pays a depot operator a monthly fee to store and maintain spares.
Depot Maersk X83. ISO Container Manufacturing and Leasing: Maersk's global depot management platform operating empty container depots.
Depot Out-Gate X83. ISO Container Manufacturing and Leasing: Release of an empty container from depot to a road haulier.
Depreciated Replacement Cost X29. Ship Sale and Purchase, Management Contracts and Valuation: Valuation built from newbuild cost minus straight line depreciation.
Depression (meteorology) X16. Nautical Science, Navigation and COLREGs: Low-pressure system.
Deptford X39. Pre-1900 Maritime History: Royal dockyard on the Thames founded by Henry VIII in 1513 and closed in 1869.
Depth alongside X15. Ports, Terminals and Stevedoring: water depth measured at the berth at chart datum.
Depth Area X73. Marine Hydrography, Charting and ENC: ENC object DEPARE describing a region bounded by two depth values.
Depth charge X11. Naval Vessels, Warship Systems and Naval Architecture: Hydrostatically fused ASW weapon dropped from surface ship or aircraft.
Depth Contour X73. Marine Hydrography, Charting and ENC: ENC object DEPCNT representing a line of constant depth.
Depth contour line B3. Nautical Science: Isobath on the nautical chart.
Depth Curve X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Charted contour of equal depth, also called isobath, typically drawn at standard values such as 5, 10, 20, 50, 100, 200, and 500 meters.
Depth D X162. Naval Architecture, Stability, Resistance, and Structural Design: Vertical distance from baseline to the molded freeboard deck at side amidships.
Depth of Navigation X73. Marine Hydrography, Charting and ENC: A safety contour value compared against the four-shade depth display in ECDIS.
Depth rating X65. ROVs, AUVs, USVs and Marine Robotics: Maximum operating water depth certified for a subsea vehicle housing, typically expressed in meters of seawater.
Depth Sounding X5. Marine Surveying and Inspection: Manual or remote measurement of liquid depth in a tank.
Deputy Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Junior pilot grade qualified to handle smaller vessels under supervision before progressing to full commission.
DEQ X6. Container, Intermodal and Trade Codes: Delivered Ex Quay, withdrawn Incoterm, replaced by DAP.
Derating X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Continuous operation at reduced MCR to lower SFOC and CO2 emissions, often supported by tuning kits and turbocharger cut-out.
Derating Survey X5. Marine Surveying and Inspection: Recalculation of installed power for EEDI or EEXI purposes verified by survey.
Deratting Exemption Certificate X86. Port Agency, Husbandry and Disbursement: Now succeeded by Ship Sanitation Control Exemption Certificate.
Derby Fishery X87. Fishing Vessels and Fisheries Management: Race for fish under an Olympic style TAC, largely replaced by IFQ and cooperative systems in major fisheries.
Derbyshire (1980) X12. Maritime Casualties and Investigation: OBO bulk carrier lost in Typhoon Orchid on 9 September 1980 with 44 lives; the 2000 reopened formal investigation linked the loss to hatch cover and hull-girder failure.
Derivatives Brokerage X44. Shipping Indices, FFAs and Freight Markets: Sell-side activity of matching FFA buyers and sellers and submitting trades to clearing houses for novation.
Derived ice multiplier (POLARIS RIO) X27. Polar Code, Ice Navigation and Polar Operations: Numerical value assigned to each ice type for the POLARIS calculation.
Derrick X3. Ship Handling, Seamanship and Deck Vocabulary: Cargo boom rigged to a mast.
Derrick Barge E4. Cruise, offshore energy and auxiliary/specialised fleets: Crane barge for heavy lifts.
Derrick Equipment Set X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Surface drilling package including drawworks, top drive, and rotary table mounted in a derrick.
Desalination Brine Discharge D3. Marine environmental science, pollution and conservation: Concentrated salt effluent affecting coastal habitats.
Desalination Plant X63. Marine Auxiliary Machinery and Pumps: Equipment producing fresh water from seawater by evaporation or reverse osmosis.
Descending X103. US Inland Waterway Towing and Barge: Moving downstream on a river, the convention used in navigation reports.
Description X75. IMDG Code, Classes, Packing and Segregation: See basic description, the formal IMDG sequence for naming a UN entry on documentation.
Desensitised Explosives X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Substances under UN 3379 (liquid) and UN 3380 (solid) that are wetted or diluted to suppress explosive properties; assigned to Class 4.1.
Desensitized Explosive X75. IMDG Code, Classes, Packing and Segregation: Explosive wetted, diluted or in solution to suppress detonation properties, often Class 4.1 or Class 3.
Deserter Welfare X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Care of seafarers who abandon ship for safety reasons, often coordinated by ITF inspectors and missions.
Desiccant X1. Cargo Science, Commodities and Cargo Care: Silica gel, clay, or molecular sieve placed in container/hold to absorb moisture.
Desiccant Air Dryer X88. Marine Surface Preparation and Coatings Application: Compressed air dryer using regenerable adsorbent beads to remove moisture to low dew points for blast or breathing air service.
DESIGN X82. Saturation Diving and Offshore Diving Operations: Diving Equipment Systems Inspection Guidance Note, IMCA D 023.
Design Draft X5. Marine Surveying and Inspection: Draft used as basis for hydrostatic and scantling design.
Design Life X100. Marine Cathodic Protection and Anodes: The intended service duration on which CP system mass and component sizing are based.
Design Q X125. Superyacht Industry, Builders and Brokers: Birmingham, UK based interior design firm working on Aviva and other large yachts.
Design Service Life Extension X50. Ship Recycling, Demolition and Hong Kong Convention: The owner decision to defer recycling through additional special surveys, affecting IHM maintenance schedules.
Design vessel X175. Port Engineering, Dredging, Breakwaters, and Quays: Reference vessel selected as the basis for sizing channels, basins, fenders, mooring fittings, and quay structures.
Design waterline (DWL) B1. Naval Architecture: Waterline at design draft.
Design wave X42. Offshore Wind Installation and Cable Lay: Statistically derived extreme wave height used in structural design of offshore wind foundations.
Design Wave Method X54. Naval Architecture Software and IACS Rules: CSR-BC+OT direct strength approach using regular waves selected to maximize specific response parameters.
Design wave method DWM X162. Naval Architecture, Stability, Resistance, and Structural Design: Direct calculation approach in which a single regular wave reproduces a target long-term response amplitude operator output for structural analysis.
Designated Authority (ISPS) E1. Maritime security, geopolitics and risk: National body responsible for ISPS implementation.
Designated mooring X15. Ports, Terminals and Stevedoring: identified bollard and line plan for a specific vessel class.
Designated Person (SOPEP) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The shipboard person identified in the SOPEP under Annex I Reg 37 as responsible for activating the plan in an oil pollution incident.
Designated person ashore C2. Ship operations, crewing and technical management: DPA, ISM Code link between ship and shore management.
Designated Person Ashore (DPA) A2. Maritime safety legislation: SOLAS and its codes: Required by ISM Code section 4.
Designated Person Ashore Course X55. Marine Simulators, Training and Maritime Academies: ISM Code-aligned training for shoreside personnel acting as DPA between company and ships.
Designated Person Ashore Recycling DPA X28. Ship Recycling and End-of-Life: Shore management figure under the SRP responsible for recycling oversight.
Designated Security Duties X21. STCW Certificates, Crewing and Seafarer Welfare: DSD, STCW Regulation VI/6 paragraph 4 training for crew with assigned security tasks.
Designated Security Duties (DSD) X160. Maritime Academies, Universities, and STCW Certification: STCW A-VI/6-2 endorsement for crew members with specific duties under the ship security plan beyond general awareness.
Designated Smoking Area X41. Cruise Ship Public Health and VSP/USPH: Outdoor zone separated from food service venues to prevent contamination from ash and butts.
Designated Vessel X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: A ship explicitly named on OFAC's SDN List, EU Annex I, or UK Consolidated List by name and IMO number.
Desktop Study X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: First stage of submarine cable and pipeline route engineering, compiling charts, historical surveys, and environmental data.
DESMI X38. Propellers, Stern Gear and Shaft Lines: Danish manufacturer of pumps and propulsion components, including aft-peak and stern-tube auxiliaries.
DESMI ESL X63. Marine Auxiliary Machinery and Pumps: End-suction centrifugal pump range for general service and seawater duty.
DESMI Modulynx X63. Marine Auxiliary Machinery and Pumps: Modular centrifugal pump platform for marine applications.
DESMI NSL X63. Marine Auxiliary Machinery and Pumps: In-line single-stage centrifugal pump series for cooling and fresh water duty.
DESMI OptiSaveTM X63. Marine Auxiliary Machinery and Pumps: Frequency converter control system that reduces seawater and fresh water pump energy use.
DESMI Ro-Clean X126. Marine Oil Spill Response and OPRC Regimes: Danish manufacturer of weir, disc, and brush skimmers including the Termite, GIRAFFE, and Tarantula models.
DESMI Rotan X63. Marine Auxiliary Machinery and Pumps: Internal gear pump series used for fuel oil booster and viscous fluid duty.
DESMI S-Series X63. Marine Auxiliary Machinery and Pumps: Self-priming centrifugal pump series suited to bilge and ballast duty.
Desorption X10. Marine Biology, Fisheries and Oceanography: Release of adsorbed substances from a surface; relevant in particle-trace metal cycling.
Despachante X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: South American expediter who coordinates pilot, tug, and customs clearances on behalf of the ship's agent.
Despatch X71. Shipbrokers and Brokerage Firms: Reward paid to the charterer for completing loading or discharging within laytime.
Despatch claim X152. Maritime Arbitration and Dispute Resolution: Counterpart of demurrage paid by owners for time saved in loading or discharge, often arbitrated alongside demurrage in voyage charterparty disputes.
Despatch half demurrage X71. Shipbrokers and Brokerage Firms: Standard formula where despatch equals 50 percent of the demurrage rate.
Despatch money C1. Commercial shipping, chartering, economics and finance: Sum payable by owners to charterers for laytime saved.
Despatch Money (Despatch) X17. Chartering, Shipbroking and Freight Trading: Reward to the charterer for completing loading or discharge in less than laytime, usually half the demurrage rate.
Despina R, The [1979] AC 685 X143. Landmark Maritime Law Cases and Doctrines: House of Lords held that damages in tort could be awarded in the currency that best reflected the plaintiff's loss.
DESS (Distress Safety Service) X68. Maritime Satcom and Telecommunications: Inmarsat C category for SOLAS-compliant distress messaging to maritime rescue coordination centers.
DESS (Dual-fuel Engine Slow Speed) D6. Decarbonization, emissions and alternative fuels: Slow-speed dual-fuel marine engine.
Destination delivery charge C3. Logistics, freight forwarding and multimodal trade: DDC, liner charge at destination.
Destroyer X62. Naval Warships and Combat Systems: Fast and maneuverable surface combatant operating in anti-air, anti-surface, and anti-submarine warfare roles.
Destroyer (DD/DDG) E2. Naval, defence and maritime law enforcement: Multi-mission medium surface combatant.
Det Norske Maskinistforbund X102. Seafarer Welfare and Maritime Charities: Norwegian Union of Marine Engineers, founded 1902, representing engineering officers in the Norwegian fleet.
Det Norske Veritas X54. Naval Architecture Software and IACS Rules: Norwegian classification society now part of DNV, founded 1864, IACS member.
Det Norske Veritas (DNV) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Norwegian classification society publishing standards for subsea pipelines (DNV-ST-F101) and submarine cables (DNV-RP-0360).
Det Norske Veritas Academy F3. Seafaring Life, Education, Professions and Institutions: Training arm of DNV.
Det Norske Veritas Bunker Notation X72. Bunkering Hubs and Bunker Suppliers: DNV class notation for bunker tankers and LNG bunker vessels covering hull, cargo, and transfer arrangements.
DET NORSKE VERITAS GL Maritime Academy X121. Maritime Education, Academies and Universities: DNV training arm offering ISM, ISPS, MLC and surveyor training globally.
Detached Block X28. Ship Recycling and End-of-Life: Section of hull or superstructure separated from the main body during primary cutting.