Glossary

Maritime glossary, terms beginning with H (page 3)

All maritime glossary terms that begin with the letter H, drawn from every subject section. 1949 entries.

Showing 250 of 1949 terms (page 3 of 8).

HDI Global X117. Marine Insurance Markets, Captives and Reinsurance: Talanx Group's industrial insurer writing marine hull and cargo.
HDM X89. ECDIS and Bridge Equipment Makers: NMEA sentence transmitting magnetic heading from a magnetic compass.
HDPE duct X42. Offshore Wind Installation and Cable Lay: High density polyethylene conduit installed through HDD bores receiving the pulled-through submarine cable.
HDPE pipe X15. Ports, Terminals and Stevedoring: high-density polyethylene pipe used in dredging discharge lines.
HDT X89. ECDIS and Bridge Equipment Makers: NMEA sentence transmitting true heading from a gyrocompass or GNSS compass.
HDW (Howaldtswerke-Deutsche Werft) X91. Submarines and Submarine Cable Systems: German submarine builder at Kiel, now part of thyssenkrupp Marine Systems.
Head X3. Ship Handling, Seamanship and Deck Vocabulary: Top of a sail; toilet; bow.
Head (low head turbine) X57. Ocean Energy Beyond Wind: Operating pressure difference for which tidal range turbines and some run-of-river designs are optimized.
Head (Pump) X63. Marine Auxiliary Machinery and Pumps: Energy per unit weight imparted by a pump to the fluid, expressed in meters of fluid column.
Head broker X71. Shipbrokers and Brokerage Firms: Broker mandated directly by the principal, distinct from sub-brokers in the chain.
Head Charter X17. Chartering, Shipbroking and Freight Trading: Top-level charter from owner to first charterer, who may sub-charter.
Head line X3. Ship Handling, Seamanship and Deck Vocabulary: Mooring line led forward from the bow.
Head On Situation X109. Maritime Autonomous Surface Ships and MASS Code: The COLREGs scenario in which two power driven vessels approach on reciprocal courses, addressed by Rule 14.
Head reach X3. Ship Handling, Seamanship and Deck Vocabulary: Distance a ship continues to move ahead after engines are stopped or reversed.
Head sea X3. Ship Handling, Seamanship and Deck Vocabulary: Sea running against the ship's course.
Head-up display X16. Nautical Science, Navigation and COLREGs: Radar/ECDIS orientation with ship's head at the top.
Headache assessment X36. Shipboard Medical, Telemedicine and Seafarer Health: IMGS chapter differentiates tension, migraine, and red-flag neurological causes.
Headblock X94. Port Machinery and Quay Equipment Makers: Upper frame of a container spreader connecting the four hoist ropes to the telescopic beams.
Header X15. Ports, Terminals and Stevedoring: collection pipe at tank terminal manifolds.
Heading F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Direction in which a vessel's bow is pointing.
Heading control mode X122. Submarine Cable Laying, Repair Vessels and Operators: DP sub-mode keeping vessel head into prevailing seas while maintaining cable engine alignment during lay operations.
Heading Control System X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: IMO term in MSC.64(67) for an autopilot maintaining a preset heading using heading and rate inputs.
Heading Hold X109. Maritime Autonomous Surface Ships and MASS Code: An autopilot mode maintaining a commanded compass heading, exposed to the autonomy planner as a low level service.
Heading line X16. Nautical Science, Navigation and COLREGs: Radar bearing line indicating own ship's heading.
Heading Mark X80. Maritime Search and Rescue Coordination: Geographic feature used by SRU to maintain pattern heading.
Heading marker X16. Nautical Science, Navigation and COLREGs: Index on a compass card aligned with the lubber line.
Heading Sensor E3. Technology, digitalization and smart shipping: Component feeding gyro/satellite-derived heading.
Heading sensor (THD) B3. Nautical Science: Transmitting heading device per IMO MSC.116(73).
Headland eddy X10. Marine Biology, Fisheries and Oceanography: Eddy formed in the lee of a coastal promontory.
Headline X87. Fishing Vessels and Fisheries Management: Upper edge of the trawl mouth, fitted with floats to maintain vertical opening.
Headline Height X87. Fishing Vessels and Fisheries Management: Vertical opening of the trawl mouth, a parameter monitored by trawl sonar.
Headline Sonar X87. Fishing Vessels and Fisheries Management: Acoustic sensor mounted on the headline to monitor net geometry and fish entry.
Headlog X103. US Inland Waterway Towing and Barge: The transverse beam at the bow or stern of a hopper barge.
Headquarters Agreement A1. The IMO and the international regulatory framework: 1968 agreement with the United Kingdom on IMO premises at 4 Albert Embankment, London.
Heads of agreement C1. Commercial shipping, chartering, economics and finance: Pre-contract document setting out main commercial terms.
Heads of Damages X51. Maritime Arbitration, Law and BIMCO Clauses: The categories of recoverable loss in a maritime claim, such as cargo damage, demurrage, and consequential expense.
Headsail X84. Yacht Racing, Regattas and Sailing Governance: A sail set forward of the mast, including jibs, genoas and Code Zeros.
Headway X3. Ship Handling, Seamanship and Deck Vocabulary: Forward motion through the water.
Heaft of Vasa's Conservation F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Stockholm program preserving the seventeenth-century warship.
HEALPix X73. Marine Hydrography, Charting and ENC: A spherical pixelisation scheme used in some bathymetric grid distributions.
Health Declaration Card X41. Cruise Ship Public Health and VSP/USPH: Document presented at the gangway before embarkation asking about recent GI and respiratory symptoms.
Health Examination (Pre-Joining) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Seafarer medical fitness certificate under STCW and MLC Regulation 1.2.
Health protection X21. STCW Certificates, Crewing and Seafarer Welfare: MLC Title 4 measures including onboard medical care and shore based services.
Healy X52. Polar Code, Arctic and Antarctic Shipping: USCGC Healy WAGB-20, US Coast Guard medium icebreaker commissioned on 21 August 2000, homeported at Seattle.
Hearing Bundle X51. Maritime Arbitration, Law and BIMCO Clauses: The collated written materials presented to the tribunal at the merits hearing.
Hearing bundles X152. Maritime Arbitration and Dispute Resolution: Indexed and paginated document compilations prepared for an arbitration hearing, typically electronic in modern LMAA and SCMA practice.
Heat balance B2. Marine Engineering: Energy accounting in propulsion and waste-heat systems.
Heat Capacity D1. Physical and chemical oceanography and marine meteorology: Amount of heat needed to raise the temperature of a unit mass by one degree.
Heat content (ocean) X10. Marine Biology, Fisheries and Oceanography: Total thermal energy stored in the ocean.
Heat Content (OHC) D1. Physical and chemical oceanography and marine meteorology: Integrated heat stored in a water column, often expressed for the upper 700 or 2000 meters.
Heat Damage Survey X155. Marine Surveying Practice and Cargo Inspection: An inspection of cargo for damage caused by elevated temperatures, often involving thermographic imaging and core temperature probing.
Heat exchanger X19. Engine Room Watchkeeping and UMS Operations: Plate or tube device transferring heat between two fluids without mixing.
Heat Exchanger Plate Cooler X69. EGCS Scrubbers, SCR and Marine Air Emissions: Component cooling recirculated washwater in closed-loop scrubber loops.
Heat exchanger, plate X26. Reefer Containers and Cold Chain Logistics: Compact brazed-plate evaporator option on some modern reefer units.
Heat input X58. Shipbuilding Yards and Construction: Energy per unit length deposited into a weld, controlled to limit distortion and heat-affected-zone effects.
Heat leak X56. LNG/LPG Carriers and IGC Code: Heat ingress from environment into cargo tank insulation that drives BOG generation.
Heat load X26. Reefer Containers and Cold Chain Logistics: Sum of conduction, infiltration, respiration, and lighting heat the reefer must remove.
Heat Recovery Steam Generator X63. Marine Auxiliary Machinery and Pumps: Boiler producing steam from exhaust gas of diesel engines or turbines.
Heat Source X75. IMDG Code, Classes, Packing and Segregation: Source of heat such as engine room bulkhead, segregation distance from heat sensitive cargo given by stowage codes such as SW2.
Heat stroke X36. Shipboard Medical, Telemedicine and Seafarer Health: Engine-room and tropical-deck risk; treated with rapid cooling, IV fluids, and MEDEVAC.
Heat Transfer Oil Inventory X50. Ship Recycling, Demolition and Hong Kong Convention: The IHM Part II declaration of synthetic heat transfer oils in cargo heating systems, which may contain regulated chemistries.
Heat treatment X58. Shipbuilding Yards and Construction: Postweld stress relief or normalizing of critical structures.
Heat-affected zone (HAZ) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Region of microstructural change near weld.
Heat-resistant aluminum X45. Marine Paints, Coatings and Antifouling: Silicone-aluminum coating used on exhaust uptakes and funnel internals.
Heat-resistant silicone X45. Marine Paints, Coatings and Antifouling: Coating chemistry capable of service to about 600 degrees Celsius for exhaust uptakes.
Heat-Sensitive Cargo X1. Cargo Science, Commodities and Cargo Care: Cargo that degrades with temperature (chocolate, pharmaceuticals).
Heated Suit X82. Saturation Diving and Offshore Diving Operations: Diver suit circulating hot water for thermal protection.
Heated tank X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Bunker tank fitted with steam or thermal-oil coils to maintain residual fuel pumpability.
Heated Tank Barge X103. US Inland Waterway Towing and Barge: A tank barge equipped with cargo heating coils for viscous or congealing cargoes.
Heater X19. Engine Room Watchkeeping and UMS Operations: Steam, thermal oil, or electric unit raising fluid temperature, used on fuel and tank heating.
Heater Coils, Cargo Tank X1. Cargo Science, Commodities and Cargo Care: Steam coils to keep heated cargoes pumpable.
Heating coil X47. Marine Fuel Quality and ISO 8217: Steam or thermal-oil coil in a fuel tank used to maintain residual fuel at pumpable viscosity.
Heating Coil Survey X115. Marine Bunker and Cargo Surveying: Pressure and integrity testing of cargo tank heating coils before loading heated cargoes such as fuel oil or vegetable oils.
Heating Coil Test X5. Marine Surveying and Inspection: Pressure test of cargo heating coils on product tankers.
Heating Devices in CTUs X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Permitted only when the substance temperature is controlled and equipment is certified, per 5.5.3 dry ice and refrigerated substances.
Heating value X47. Marine Fuel Quality and ISO 8217: See calorific value.
Heave B1. Naval Architecture: Vertical translational motion.
Heave around X3. Ship Handling, Seamanship and Deck Vocabulary: Turn the capstan or winch in the hauling direction.
Heave Compensated Crane X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Offshore crane on installation vessels that compensates for vessel motion when lowering cable accessories and pipeline structures.
Heave Compensation D2. Hydrography, tides, waves, bathymetry and marine geology: Correction for vertical platform motion in multibeam surveying.
Heave Compensator X14. Offshore Oil and Gas Marine Operations: System absorbing vessel heave between vessel and load.
Heave down X3. Ship Handling, Seamanship and Deck Vocabulary: Careen.
Heave Limit X31. Helicopter Operations on Ships: Maximum permissible vertical deck motion, typically 1 m for unrestricted operations.
Heave-to B3. Nautical Science: Maneuver to hold position in heavy weather.
Heaving line X3. Ship Handling, Seamanship and Deck Vocabulary: Light line thrown to a wharf to haul over a heavier mooring rope.
Heavy & Specialized Transport Carriers Conference (HSTCC) X104. Project Cargo Forwarders and Heavy Transport: North American forum for specialized hauliers and forwarders.
Heavy Cargo Hook X104. Project Cargo Forwarders and Heavy Transport: Forged hook used on heavy lift cranes, certified per ASME B30.10 or equivalent.
Heavy Displacement X98. Ship Registries and Flag States: Total weight of a vessel including hull, machinery, cargo, stores, fuel, and ballast.
Heavy Equipment Manager X104. Project Cargo Forwarders and Heavy Transport: Forwarder role responsible for cranes, SPMTs, and ancillary heavy gear on a project.
Heavy Fuel Oil X13. Marine Salvage and Wreck Removal: Bunker fuel grade requiring heated lightering during salvage offload.
Heavy fuel oil (HFO) B2. Marine Engineering: Residual marine fuel, RMG 380, ISO 8217.
Heavy Fuel Oil Recovery X60. Marine Salvage and Wreck Removal: Removal of viscous IFO 380 and similar bunkers from a casualty, often requiring heating.
Heavy Fuel Oil Residue Disposal X50. Ship Recycling, Demolition and Hong Kong Convention: The categorized removal of HFO sludge and tank washings before hot work begins, recorded in the SRP.
Heavy Haul Permit X104. Project Cargo Forwarders and Heavy Transport: Authorization to move an oversize or overweight load over public roads.
Heavy lift C1. Commercial shipping, chartering, economics and finance: Cargo above the lifting capacity of standard ship gear.
Heavy Lift Barge X103. US Inland Waterway Towing and Barge: A reinforced deck barge designed for very heavy single-piece cargoes.
Heavy lift berth X15. Ports, Terminals and Stevedoring: berth with reinforced apron and clearance for project cargo cranes.
Heavy Lift Cargo X1. Cargo Science, Commodities and Cargo Care: Single piece above ship's gear capacity.
Heavy Lift Code Guidance X104. Project Cargo Forwarders and Heavy Transport: IMO MSC.1/Circ.1353 guidance on shipboard handling of heavy cargo.
Heavy Lift Concept Study X104. Project Cargo Forwarders and Heavy Transport: Early stage study comparing crane, SPMT, and skidding solutions for a project unit.
Heavy lift crane X59. Offshore Wind O&M, CTVs and SOVs: Large capacity crane aboard a jack up or floating heavy lift vessel used for component change outs on operating turbines.
Heavy Lift Crane Recovery X28. Ship Recycling and End-of-Life: Salvage of cargo gear, typically refurbished and resold.
Heavy lift dredger X124. Dredging Industry and Reclamation Contractors: Working CSD lifted and shipped on a heavy-transport vessel for global mobilization.
Heavy Lift Insurance X104. Project Cargo Forwarders and Heavy Transport: Marine and project cargo insurance covering oversize units and project moves.
Heavy lift lashing X76. Stevedoring, Lashing and Cargo Securing: Specialized securing arrangement for project cargoes exceeding standard breakbulk loads.
Heavy Lift Project Agency X86. Port Agency, Husbandry and Disbursement: Agency support for heavy lift and project cargo movements.
Heavy Lift Project Loan X49. Ship Finance, Leasing and Maritime Capital Markets: Bespoke loan secured by specialized heavy lift tonnage.
Heavy Lift Sling Set X104. Project Cargo Forwarders and Heavy Transport: Engineered set of slings sized and certified for a specific project lift.
Heavy Lift Survey X43. Marine Surveying and Warranty Surveying: A specialist warranty attendance covering rigging design review, load tests, weather windows, and lift execution for project cargo moves.
Heavy Lift Vessel X13. Marine Salvage and Wreck Removal: Semi submersible ship that floats under a wreck section for dry transport.
Heavy Metal D3. Marine environmental science, pollution and conservation: Metals such as mercury, cadmium, and lead with toxicological concern.
Heavy Naphtha X1. Cargo Science, Commodities and Cargo Care: Refined product feedstock for reforming.
Heavy Tested Container X83. ISO Container Manufacturing and Leasing: Container that has passed payload tests above standard 30,480 kg.
Heavy Transport Vehicle (HTV) X104. Project Cargo Forwarders and Heavy Transport: Road combination configured for abnormal indivisible loads.
Heavy Weather X108. Marine Insurance and P&I Clubs: A peril of the seas covered under standard hull and P&I wordings for storm related damage.
Heavy Weather Damage X4. Marine Insurance, P&I and Claims: hull damage from sea perils, with successive heavy weather periods aggregated under ITC Hulls 1/10/83 clause 12.2.
Heavy weather damage report C2. Ship operations, crewing and technical management: Report of damage from heavy weather.
Heavy-duty coating X45. Marine Paints, Coatings and Antifouling: Marine and protective coating designed for severe service environments.
Heavy-lift quay X175. Port Engineering, Dredging, Breakwaters, and Quays: Quay wall designed for very high deck and crane loads, typical of project cargo and offshore fabrication terminals.
Heavy-lift ship (Dockwise type) B5. Ship Types and Individual Vessels: Semi-submersible heavy transport.
Heavy-Lift Vessel (HLV) E4. Cruise, offshore energy and auxiliary/specialised fleets: Project-cargo ship with high-capacity cranes.
Heavy-Transport Ship (Float-On/Float-Off) E4. Cruise, offshore energy and auxiliary/specialised fleets: Semi-submersible heavy transporter (e.g., Dockwise).
Heavycon X60. Marine Salvage and Wreck Removal: BIMCO standard form for the carriage of heavy lift cargoes.
HEAVYCON 2007 X17. Chartering, Shipbroking and Freight Trading: BIMCO heavy lift voyage charter party.
HEAVYLIFTVOY X17. Chartering, Shipbroking and Freight Trading: BIMCO standard heavy lift voyage form for project cargo.
Heavyweight torpedo X11. Naval Vessels, Warship Systems and Naval Architecture: 533 mm class submarine torpedo, e.g., Mk 48, Spearfish, DM2A4.
Hebei Spirit (2007) X12. Maritime Casualties and Investigation: VLCC struck by a drifting crane barge off South Korea on 7 December 2007, spilling about 10,900 tonnes.
Hebei Spirit Spill X126. Marine Oil Spill Response and OPRC Regimes: December 7, 2007 collision off Taean, South Korea releasing 10,900 tonnes of crude oil, the largest Korean spill on record.
Hecla, HMS X39. Pre-1900 Maritime History: Royal Navy bomb vessel that carried Parry on Arctic voyages from 1819 onward.
Hedge Accounting X44. Shipping Indices, FFAs and Freight Markets: Reporting treatment in which FFA gains and losses are recognized in line with the hedged physical freight exposure under IFRS or US GAAP rules.
Hedger X44. Shipping Indices, FFAs and Freight Markets: Market participant using FFAs primarily to offset existing physical freight exposure rather than to speculate.
Hedging (Sanctions Risk) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: Financial strategies used by oil traders to manage price-cap related volatility, themselves subject to compliance scrutiny.
Heel B1. Naval Architecture: Transverse inclination of the vessel.
Heel Correction X5. Marine Surveying and Inspection: Correction for list applied to mean draft in draft surveys.
Heel Spring X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Exhaust valve spring fitted to MAN B&W exhaust valves, renewed at major valve overhauls.
Heeling moment X162. Naval Architecture, Stability, Resistance, and Structural Design: External moment about the longitudinal axis from wind, turning, or shifted weight that the righting moment must balance.
Heeling moment (passenger ship) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: SOLAS II-1/7-2 sets criteria for assumed heel after damage, with margin line not submerged.
Heeling Pump X13. Marine Salvage and Wreck Removal: Cross-flooding pump used to control vessel list during salvage.
Heeling tank (icebreaker) X27. Polar Code, Ice Navigation and Polar Operations: Tank system that rapidly transfers ballast side to side to break stuck ice.
Heerema X42. Offshore Wind Installation and Cable Lay: Dutch heavy lift contractor operating Thialf and Sleipnir, active in offshore wind foundation and substation installation.
Heerema Marine Contractors X81. Project Cargo, Heavy-Lift and Module Carriers: Leiden-based offshore contractor operating the world's largest semi-submersible crane vessels, including Thialf and Sleipnir.
Heesen Yachts X35. Yacht and Superyacht Industry: Dutch builder in Oss specializing in fast aluminum and steel superyachts.
Heidmar Pools X17. Chartering, Shipbroking and Freight Trading: Commercial pools (Sigma, Star, Seawolf) operated by Heidmar for tankers.
Heinrich Event D1. Physical and chemical oceanography and marine meteorology: Past episodes of massive iceberg discharge into the North Atlantic.
HELCOM D3. Marine environmental science, pollution and conservation: Helsinki Commission protecting the Baltic Sea marine environment.
HELCOM AIS X74. AIS Data, Vessel Tracking and Maritime Intelligence: Baltic Sea regional AIS network coordinated by the Helsinki Commission.
HELCOM Hydrographic Re-survey Scheme X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Coordinated Baltic Sea hydrographic survey programme run by Helsinki Commission member states to bring shipping routes to modern survey standards.
Held Covered X4. Marine Insurance, P&I and Claims: provision continuing cover on breach of warranty, deviation, change of voyage, or misdescription subject to notice and additional premium.
Helena X128. Sail Training Ships and Tall Ship Associations: Finnish three masted topsail schooner built 1992 at Uudenkaupungin Vene Uusikaupunki, 36 m length, operated by the Sail Training Association Finland.
Helgoland X57. Ocean Energy Beyond Wind: German North Sea island used as a logistics base for offshore wind and the AquaVentus hydrogen initiative.
Heli-Lift Salvage X60. Marine Salvage and Wreck Removal: Use of heavy lift helicopters to deliver pumps, generators, and personnel to a casualty.
Helical Screw Pump X63. Marine Auxiliary Machinery and Pumps: Common designation for a single screw, twin-screw, or three-screw positive displacement pump.
Helically-Coiled Boiler X63. Marine Auxiliary Machinery and Pumps: Boiler design with coiled water tubes around the furnace, used in small package units.
Helicoidal pitch B1. Naval Architecture: Geometric pitch of a propeller blade section.
Helicopter Carrier (LPH historically) E2. Naval, defence and maritime law enforcement: Carrier for rotary-wing assault aviation.
Helicopter hoisting X59. Offshore Wind O&M, CTVs and SOVs: Technique by which a helicopter winches technicians directly to a turbine nacelle roof platform.
Helicopter Landing Officer X31. Helicopter Operations on Ships: Senior helideck role responsible for safe helicopter handling.
Helicopter Landing Officer (HLO) X36. Shipboard Medical, Telemedicine and Seafarer Health: Trained crew supervising MEDEVAC helicopter operations.
Helicopter Operating Company X31. Helicopter Operations on Ships: Commercial operator providing offshore or SAR helicopter services.
Helicopter Operations IMO MSC/Circ.490 X97. Polar Expedition Cruise and IAATO Operations: IMO circular providing guidance on helicopter-assisted operations including landings on cruise vessels.
Helicopter pilot transfer X32. Marine Pilotage and Pilot Operations: Helicopter winch or landing transfer of a pilot, used in adverse weather or at far offshore stations.
Helicopter Transfer X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Pilot delivery method by rotorcraft used at exposed boarding grounds such as Europoort, the Humber, and offshore Australia.
Helicopter Underwater Escape Training X55. Marine Simulators, Training and Maritime Academies: HUET course providing practical egress training from a submerged helicopter mockup, common for offshore workers.
Helicopter winch evacuation X36. Shipboard Medical, Telemedicine and Seafarer Health: Hi-line technique used by SAR aircraft to lift a casualty in Stokes basket.
Helideck X11. Naval Vessels, Warship Systems and Naval Architecture: Flight deck on surface combatant sized for embarked helicopter.
Helideck classification X156. Superyacht Industry, Builders, and Yacht Charter Market: REG Large Yacht Code requirement for compliance with CAP 437 or equivalent for any installed helicopter landing platform.
Helideck Monitoring System X31. Helicopter Operations on Ships: Sensor suite measuring deck motion, wind, and environmental envelope.
Helideck Salvage X13. Marine Salvage and Wreck Removal: Provision of helicopter access to a casualty for personnel and equipment.
Helideck Survey X43. Marine Surveying and Warranty Surveying: An inspection of offshore and shipboard helidecks against CAP 437 or equivalent standards for structural and operational suitability.
Helios X124. Dredging Industry and Reclamation Contractors: Jan De Nul CSD of 23,200 kW installed, the largest CSD afloat alongside Spartacus.
Helios Class X64. Cruise Industry Operators, Brands and Ships: AIDA Cruises LNG dual-fuel class including AIDAnova and AIDAcosma.
Heliox X82. Saturation Diving and Offshore Diving Operations: Breathing mix of helium and oxygen typically 95-98 percent helium for saturation.
Heliport Crane X104. Project Cargo Forwarders and Heavy Transport: Crane positioned to assemble or maintain offshore platform helidecks.
Heliservice X31. Helicopter Operations on Ships: German offshore helicopter operator serving North Sea wind farms.
HeliService International X80. Maritime Search and Rescue Coordination: German offshore helicopter operator with SAR capability.
Helistop / Touch-and-Go pad X35. Yacht and Superyacht Industry: Helicopter landing area used only for boarding and disembarkation without refueling or shutdown.
Helium Recovery System X82. Saturation Diving and Offshore Diving Operations: HRS, the closed-loop reclaim plant on a saturation DSV.
Helium Speech Unscrambler X82. Saturation Diving and Offshore Diving Operations: Electronic device translating high-pitched heliox voice for surface listeners.
Helium Voice X82. Saturation Diving and Offshore Diving Operations: Distortion of speech in heliox due to gas density and sound speed.
Helix Energy Solutions X82. Saturation Diving and Offshore Diving Operations: US offshore well intervention contractor operating the Q-series vessels.
Helix Producer I X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Helix Energy Solutions floating production unit working in the US Gulf of Mexico.
Helix Q5000 X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Helix Energy Solutions semisubmersible well intervention vessel with subsea intervention lubricator.
Helix Q7000 X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Helix Energy Solutions semisubmersible well intervention vessel based on a sixth-generation hull.
Helix Well Containment Group (HWCG) X126. Marine Oil Spill Response and OPRC Regimes: US deepwater Gulf of Mexico capping consortium operating the Helix Producer I and Q4000.
Hellas X175. Port Engineering, Dredging, Breakwaters, and Quays: Trailing suction hopper dredger in the Jan De Nul fleet.
Hellas Aphrodite X134. LNG and LPG Carrier Operators and Containment Systems: LNG carrier of 173,400 m3 delivered 2018 by Daewoo for Latsco LNG Marine, MEGI propulsion.
Hellas Hera X134. LNG and LPG Carrier Operators and Containment Systems: LNG carrier of 173,400 m3 delivered 2018 by Daewoo Shipbuilding for Latsco LNG Marine.
Hellenic Aegean PSSA Proposal X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: A proposed Particularly Sensitive Sea Area in the Aegean Sea brought forward in MEPC discussions toward 2024.
Hellenic Bank Shipping X49. Ship Finance, Leasing and Maritime Capital Markets: Cypriot bank that has selectively financed Greek owners.
Hellenic Brokerage Cluster X71. Shipbrokers and Brokerage Firms: Informal name for the dense network of Piraeus shipbrokers.
Hellenic Cables X15. Ports, Terminals and Stevedoring: supplier of shore-power cabling used in cold-ironing installations.
Hellenic Centre for the Treatment of Sick Seafarers X36. Shipboard Medical, Telemedicine and Seafarer Health: Athens-based TMAS for Greek-flagged ships.
Hellenic Chamber of Shipping Arbitration X51. Maritime Arbitration, Law and BIMCO Clauses: A Greek institution administering maritime references seated in Piraeus.
Hellenic Coast Guard X98. Ship Registries and Flag States: Greek law enforcement and flag state authority responsible for the national ship registry.
Hellenic Coast Guard casualty interface X163. Marine Accident Investigation Agencies and Landmark Inquiries: Operational coast guard role in providing initial response data to HBMCI safety investigations.
Hellenic Coast Guard VTMIS X74. AIS Data, Vessel Tracking and Maritime Intelligence: Greek vessel traffic monitoring system integrating AIS, radar and LRIT.
Hellenic Marine Environment Protection Association (HELMEPA) F3. Seafaring Life, Education, Professions and Institutions: Greek industry voluntary environmental association.
Hellenic Marine Environment Protection Association Training X121. Maritime Education, Academies and Universities: HELMEPA provides supplementary maritime environmental training in Athens.
Hellenic Mediterranean Lines X85. Ferries, Ro-Pax Operators and Routes: Historical Greek Adriatic operator now defunct.
Hellenic Mutual War Risks Association (Bermuda) Limited X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Hellenic War Risks Club managed by Thomas Miller, founded 1971, predominantly Greek shipowners.
Hellenic Navy X77. Naval Mine Warfare and Mine Countermeasures: Operator of the Hunt-class and ex-Tripartite Kriton-class minehunters.
Hellenic Petroleum X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: Greek refiner and bunker supplier at Piraeus and Aspropyrgos.
Hellenic Petroleum Attack X139. Maritime Cybersecurity, OT Threats and Standards: 2022 ransomware affecting the Greek refiner and downstream tanker operations.
Hellenic Pilots X32. Marine Pilotage and Pilot Operations: Greek pilots' service operating in ports such as Piraeus and Thessaloniki.
Hellenic Register of Shipping X7. Flag State, Port State Control and Detention Vocabulary: HRS, Greek classification society, recognized organization for Greece.
Hellenic Republic Public Power Corporation X25. Maritime Cybersecurity, OT and IT: Greek electricity utility hit by Egregor ransomware in February 2022.
Hellenic Rescue Team X80. Maritime Search and Rescue Coordination: Greek volunteer SAR organization supporting state services.
Hellenic Salvage Co X167. Major Salvage Companies, Wreck Removals, and Equipment: Greek salvage company active in eastern Mediterranean casualty response.
Hellenic Seaways X85. Ferries, Ro-Pax Operators and Routes: Attica Group brand operating Aegean conventional and fast craft services from Piraeus and Rafina.
Hellenic Shipbrokers X29. Ship Sale and Purchase, Management Contracts and Valuation: Athens based brokering community, large in tanker S&P.
Hellenic Shipping News X101. Vessel Brokerage Software and Chartering Platforms: Piraeus-based shipping news portal publishing daily market reports, position lists, and bunker prices.
Hellenic Shipyards 2018 X48. Maritime Cybersecurity: 2018 incident involving Hellenic Shipyards reported in open sources, highlighting cyber exposure of shipyard infrastructure.
Hellenic Shipyards Skaramangas X58. Shipbuilding Yards and Construction: Greek shipyard at Skaramangas building naval vessels and submarines under license.
Hellenic War Risks Mutual X157. Marine Loss Adjusters, GA Practice, and Casualty Firms: Greek war risks mutual managed by Tindall Riley.
Hellenistic Sea Power F1. Maritime History: Ptolemaic and Seleucid naval forces of the eastern Mediterranean.
Hellespont X175. Port Engineering, Dredging, Breakwaters, and Quays: Trailing suction hopper dredger in the Jan De Nul fleet.
Hellespont Salvage X60. Marine Salvage and Wreck Removal: Greek salvage company with international LOF experience.
Hellmann Shipping Services X86. Port Agency, Husbandry and Disbursement: Hellmann Worldwide Logistics maritime arm offering agency-adjacent services.
Hellmann Worldwide Logistics X104. Project Cargo Forwarders and Heavy Transport: Bremen-based global forwarder with project and air freight divisions.
Helly Hansen NOOD Regatta F4. Recreational Boating, Yachting and Sport: US-Sailing-supported regional regatta series.
Helm X3. Ship Handling, Seamanship and Deck Vocabulary: Steering control of a vessel; the wheel and rudder.
Helm CONNECT X101. Vessel Brokerage Software and Chartering Platforms: Fleet management software from Helm Operations, a Victoria, British Columbia vendor focused on tug, barge, and workboat operators.
Helm Operations X101. Vessel Brokerage Software and Chartering Platforms: Canadian maritime software company acquired by ABB in 2017 and operating Helm CONNECT.
Helm Order Printer X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Optional printer on the bridge recording helm and engine orders, supplanted by VDR audio capture.
Helm Orders F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Standard wheel commands such as "starboard 10."
Helm Position X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Steering wheel or non-follow-up tiller location on the bridge.
Helmepa X114. Maritime Arbitration and Shipping Law Firms: Hellenic Marine Environment Protection Association referenced in environmental arbitrations.
HELMEPA Maritime Training Centre X121. Maritime Education, Academies and Universities: Same as above, founded 1982 by Greek shipowners.
Helmholtz Equation X54. Naval Architecture Software and IACS Rules: Reduced wave equation solved in frequency-domain potential flow seakeeping codes.
Helmholtz resonance (moonpool) B1. Naval Architecture: Vertical oscillation of water column in a moonpool.
Helmsman X3. Ship Handling, Seamanship and Deck Vocabulary: Person at the wheel.
Help Onboard Programme X154. Maritime Welfare, Seafarer Charities, and MLC Rights: ISWAN-led crew welfare resource pack distributed to shipowners.
Helsinki X64. Cruise Industry Operators, Brands and Ships: Finnish cruise port on the Baltic Sea.
Helsinki Bunker Service X72. Bunkering Hubs and Bunker Suppliers: Bunker supply at Helsinki by Neste through truck to ship and barge delivery.
Helsinki Seamen's Mission X102. Seafarer Welfare and Maritime Charities: Finnish Lutheran maritime ministry operating chaplaincies in major Finnish ports under Suomen Merimieskirkko.
Helsinki South Harbour X164. Cruise Industry, Brands, Ship Classes, and Terminals: The cruise terminal in central Helsinki at Olympia Terminal and Eteläsatama serving Baltic itineraries.
Helvetia X117. Marine Insurance Markets, Captives and Reinsurance: Swiss insurer writing marine cargo and transport, with the Helvetia Marine Cargo wording.
HelWin Alpha X123. Offshore Wind Installation Vessels and Operators: 576 MW HVDC converter platform in German North Sea, transmits power from Nordsee Ost and Meerwind Sud Ost.
HelWin1 X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: 576 MW HVDC link between the HelWin alpha offshore platform in the German Bight and the Büttel onshore station.
HelWin2 X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: 690 MW HVDC link connecting HelWin beta to the Büttel onshore converter station.
HEMOS X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: MAN PrimeServ historical engine monitoring and operating system collecting performance data for trend analysis.
HEMP Hardening X68. Maritime Satcom and Telecommunications: Protective design against high-altitude electromagnetic pulse, sometimes required for naval terminals.
Hempadur X45. Marine Paints, Coatings and Antifouling: Hempel pure-epoxy range used as primer, intermediate, and tank lining.
Hempadur 35760 X93. IBC Code and Chemical Tanker Operations: Hempel epoxy phenolic cargo tank coating in the Hempadur series.
Hempadur 35770 X93. IBC Code and Chemical Tanker Operations: Hempel epoxy phenolic cargo tank coating designed for resistance to a range of chemical cargoes.
Hempadur 47140 X88. Marine Surface Preparation and Coatings Application: Hempel two-component amine-cured epoxy widely specified as anticorrosive and tank lining.
Hempadur 85671 X93. IBC Code and Chemical Tanker Operations: Hempel epoxy phenolic cargo tank coating used in chemical and product tanker tanks.
Hempadur Quattro X45. Marine Paints, Coatings and Antifouling: Hempel high-build epoxy product line for hull and ballast tank applications.
Hempaguard X112. IMO GHG Strategy, CII, EEXI and EU Maritime Regulation: Silicone hydrogel fouling release coating from Hempel typically delivering 2 to 5 percent fuel savings.
HEMPAGUARD (Hempel) X18. Ballast Water, Biofouling and Antifouling: Silicone hydrogel based foul release coating with low biocide content.