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Glossary

Maritime glossary, terms beginning with H (page 4)

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

Showing 250 of 1949 terms (page 4 of 8).

Hempaguard MaX X165. Marine Coatings, Antifouling, and Hull Husbandry
Hempel silicone-hydrogel fouling-release coating with biocide assistance for idle periods up to 120 days.
Hempaline X45. Marine Paints, Coatings and Antifouling
Hempel range of tank linings for chemical and product cargoes.
Hempaline Defend 630 X93. IBC Code and Chemical Tanker Operations
Hempel chemical-resistant coating in the Hempaline Defend product range used in industrial linings.
Hempaline Defend 700 X93. IBC Code and Chemical Tanker Operations
Hempel chemical-resistant coating used in tank lining applications including selected cargo tank services.
Hempaprime X45. Marine Paints, Coatings and Antifouling
Hempel underwater hull primer family used beneath antifoulings.
Hempasil X45. Marine Paints, Coatings and Antifouling
Hempel silicone-based fouling-release coating brand.
Hempasil X3 X45. Marine Paints, Coatings and Antifouling
Hempel silicone hydrogel fouling-release coating system.
Hempathane X165. Marine Coatings, Antifouling, and Hull Husbandry
Hempel range of two-component aliphatic polyurethane finish coats for topsides and superstructures.
Hempathane 55210 X88. Marine Surface Preparation and Coatings Application
Hempel aliphatic two-component polyurethane topcoat.
Hempel X45. Marine Paints, Coatings and Antifouling
Danish marine coatings manufacturer founded in 1915 by J.C. Hempel, headquartered in Lyngby.
HEMPEL Globic X18. Ballast Water, Biofouling and Antifouling
Self-polishing copolymer antifouling brand.
Hempel Hydrometer X115. Marine Bunker and Cargo Surveying
Brand of glass petroleum hydrometer commonly used by surveyors for manual density measurement of fuel and cargo.
Hempel Marathon X45. Marine Paints, Coatings and Antifouling
Hempel CDP antifouling family for short docking intervals and slower vessels.
Hempel Marine Fuels X72. Bunkering Hubs and Bunker Suppliers
Norwegian bunker supplier serving the offshore and short sea trades.
Hempel Olympic X45. Marine Paints, Coatings and Antifouling
Hempel self-polishing copolymer antifouling family for ocean-going trade.
HEMU X57. Ocean Energy Beyond Wind
Hammerfest energy monitoring unit, generic instrumentation reference used in early tidal stream trials.
Hengtong Marine Cable X91. Submarines and Submarine Cable Systems
Chinese submarine cable manufacturer and installer.
Hennebique X39. Pre-1900 Maritime History
Reinforced concrete system used in early twentieth-century ship construction, of late nineteenth-century origin.
Henry Abeille X137. Harbour Tugs, Towage Operators and Tug Builders
Historic French ocean salvage tug name still active in the Les Abeilles fleet under Boluda.
Henry Hub X20. LNG Operations and Custody Transfer
US natural gas price benchmark used in some LNG sales price formulas.
Henry the Navigator F1. Maritime History
Portuguese prince and patron of Atlantic exploration 1394 to 1460.
HEPA filter mask (FFP3/N95) X36. Shipboard Medical, Telemedicine and Seafarer Health
Respiratory protection during infectious disease management on board.
Hepatitis A vaccine X36. Shipboard Medical, Telemedicine and Seafarer Health
Two-dose inactivated vaccine recommended for seafarers traveling internationally.
Hepatitis B vaccine X36. Shipboard Medical, Telemedicine and Seafarer Health
Three-dose recombinant vaccine for blood-borne pathogen protection.
Heraklion X85. Ferries, Ro-Pax Operators and Routes
Cretan main port served from Piraeus by ANEK Lines and Minoan Lines.
Herald of Free Enterprise X24. Cruise, Passenger Ship and Ferry Operations
Townsend Thoresen ro-pax that capsized off Zeebrugge on 6 March 1987 with 193 fatalities.
Herald of Free Enterprise (1987) X12. Maritime Casualties and Investigation
Townsend Thoresen ro-pax that capsized off Zeebrugge on 6 March 1987 with 193 deaths; the Sheen Inquiry led to the ISM Code adopted in 1993.
Herald of Free Enterprise casualty (1987) X163. Marine Accident Investigation Agencies and Landmark Inquiries
British-flag ro-ro ferry that capsized off Zeebrugge on 6 March 1987 with 193 fatalities, investigated by the formal investigation under Mr Justice Sheen known as the Sheen Inquiry.
Herbivory X10. Marine Biology, Fisheries and Oceanography
Feeding on plants or algae.
Heriot Watt University X57. Ocean Energy Beyond Wind
Scottish university with active research programs in marine energy, subsea engineering, and CCS.
Heritage X125. Superyacht Industry, Builders and Brokers
Important consideration when valuing classic spirit of tradition yachts.
Heritage Cape Wind X42. Offshore Wind Installation and Cable Lay
Withdrawn Massachusetts offshore wind project; included only as historical reference.
Heritage Expeditions X97. Polar Expedition Cruise and IAATO Operations
New Zealand expedition operator known for subantarctic and Ross Sea voyages aboard Spirit of Enderby (Professor Khromov), 50 PAX.
Heritage Ship F2. Maritime Culture, Heritage, Archaeology, Art and Museums
Vessel maintained for its historical significance, often under national-register schemes.
Heritage-class X130. National Coast Guards and Cutter Fleets
USCG Offshore Patrol Cutter program, lead ship Argus WMSM-915, 25 hulls planned.
Hermatypic coral X10. Marine Biology, Fisheries and Oceanography
Reef-building coral with symbiotic zooxanthellae.
Hermes Cover X49. Ship Finance, Leasing and Maritime Capital Markets
German export credit guarantee for shipyard exports, administered through Euler Hermes.
Hermod X60. Marine Salvage and Wreck Removal
Heerema SSCV retired from service after decades of platform installation work.
Hero-class X130. National Coast Guards and Cutter Fleets
Canadian Coast Guard mid-shore patrol vessel built by Halifax Shipyard, nine hulls commissioned 2012-2014.
Heron II, The (Koufos v C Czarnikow Ltd) [1969] 1 AC 350 X143. Landmark Maritime Law Cases and Doctrines
House of Lords held in a sugar shipment case that damages must be of a kind not unlikely to result from breach.
Heroya Industrial Park X140. Ammonia as Marine Fuel and Hydrogen Shipping
Yara's Norwegian site producing first green ammonia from 24 MW Statkraft electrolyzer in 2024.
Herring X10. Marine Biology, Fisheries and Oceanography
*Clupea harengus* (Atlantic) and *Clupea pallasii* (Pacific), key forage fishes.
Heterotroph X10. Marine Biology, Fisheries and Oceanography
Organism that obtains energy by consuming organic matter.
Heung-A Line X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping
The South Korean intra-Asia short sea container carrier, merged with Sinokor on the JV Heung-A Line in 2020.
Hexachlorobutadiene X93. IBC Code and Chemical Tanker Operations
Halogenated hydrocarbon classed as a high hazard cargo under the IBC Code typically requiring Type 1 ship carriage.
Hexagon Smart3D X54. Naval Architecture Software and IACS Rules
3D plant and marine design platform from Hexagon, formerly Intergraph SmartMarine 3D.
Hexatronic X122. Submarine Cable Laying, Repair Vessels and Operators
Swedish fiber and cable group acquiring Rochester Cable in 2018 and supplying unrepeatered submarine cable systems and shore-end armored cable.
Hexavalent chromium X147. Ship Recycling, Hong Kong Convention, and Recycling Yards
An Annex II IHM substance found in some coatings and chrome plating onboard older ships.
Hexavalent Chromium Cr VI X28. Ship Recycling and End-of-Life
Heavy metal listed in IHM Table A, found in certain coatings and surface treatments.
Hexicon X123. Offshore Wind Installation Vessels and Operators
Swedish floating wind technology developer, twin-turbine concept piloted off Stornoway.
Heysea Yachts X156. Superyacht Industry, Builders, and Yacht Charter Market
Chinese builder at Zhuhai producing composite motor yachts up to about 50 meters.
Heyser Towing X137. Harbour Tugs, Towage Operators and Tug Builders
Baltimore harbour towage operator.
Heysham nuclear site X57. Ocean Energy Beyond Wind
Coastal site referenced in tidal range studies of Morecambe Bay and the Mersey.
HF Backup X109. Maritime Autonomous Surface Ships and MASS Code
The use of high frequency radio as a fallback communications path for MASS when satellite and cellular links are unavailable.
HF Data Modems E3. Technology, digitalization and smart shipping
Long-range radio data systems used in remote regions.
HF DSC X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation
HF Digital Selective Calling on 4207.5, 6312, 8414.5, 12577 and 16804.5 kHz.
HF NBDP X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation
HF Narrow-Band Direct Printing (radiotelex), removed from GMDSS carriage requirement in 2024.
HF Radar D5. Coastal processes, sea-level, cryosphere and ocean observation science
High-frequency coastal radar measuring surface currents.
HF Radio X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation
3 to 30 MHz maritime mobile bands listed in ITU Appendix 17.
HF/VHF Radio Channel 16 X126. Marine Oil Spill Response and OPRC Regimes
Primary distress channel for initial spill notifications under SOLAS.
HFC X70. Reefer Containers and Cold Chain Shipping
Hydrofluorocarbon refrigerant family including R-134a, R-404A, R-407C, and R-507A, subject to phase-down under the Kigali Amendment.
HFC Phase Down Reefer X136. Reefer Vessels and Cool Chain Operators
Kigali Amendment driven shift away from R-134a and R-404A refrigerants in reefer containers toward lower GWP alternatives.
HFC-134a (R134a) X26. Reefer Containers and Cold Chain Logistics
Hydrofluorocarbon refrigerant, GWP 1430, being phased down in new container reefers under EU F-Gas.
HFC-404A (R404A) X26. Reefer Containers and Cold Chain Logistics
HFC blend, GWP 3922, historically used in low-temperature container reefers.
HFC-407F (R407F) X26. Reefer Containers and Cold Chain Logistics
HFC blend, GWP 1825, lower-GWP retrofit for R404A.
HFC-449A (R449A) X26. Reefer Containers and Cold Chain Logistics
HFC/HFO blend, GWP 1397, R404A replacement.
HFC-452A (R452A) X26. Reefer Containers and Cold Chain Logistics
HFC/HFO blend, GWP 2140, R404A replacement.
HFO X19. Engine Room Watchkeeping and UMS Operations
Heavy fuel oil, residual marine fuel grade per ISO 8217 RMG and RMK.
HFO (Heavy Fuel Oil) X149. Marine Fuels, Bunkering, and Alternative Fuels
A general term for residual marine fuel typically with viscosity of 180 or 380 cSt at 50 degrees C; in the global cap era HFO usually denotes HSFO at greater than 0.50% sulfur.
HFO Antarctic ban X27. Polar Code, Ice Navigation and Polar Operations
MARPOL Annex I Regulation 43 prohibiting use and carriage of HFO south of 60 degrees S since 1 August 2011.
HFO Arctic ban X27. Polar Code, Ice Navigation and Polar Operations
MARPOL Annex I Regulation 43A prohibiting use and carriage of HFO in Arctic waters; entered force 1 July 2024.
HFO Arctic waiver X27. Polar Code, Ice Navigation and Polar Operations
Conditional exemption for Arctic coastal state flagged ships permitted until 1 July 2029.
HFO Ban X133. Polar Research Vessels and Polar Code Regimes
MARPOL Annex I Regulation 43 bans HFO in Antarctic waters since 2011, extended to Arctic waters from 1 July 2024 with derogations to 2029.
HFO Ban, Arctic X52. Polar Code, Arctic and Antarctic Shipping
MARPOL Annex I regulation 43A adopted by MEPC.329(76) prohibiting the use and carriage for use as fuel of heavy fuel oil in Arctic waters from 1 July 2024, with phased waivers and exemptions to 1…
HFO Booster Module X63. Marine Auxiliary Machinery and Pumps
Skid-mounted unit comprising feed and booster pumps, heaters, and viscotherm for fuel injection systems.
HFO Pump X141. Marine Salvage Industry and Wreck Removal Contractors
Heated heavy fuel oil pump rated to handle viscosities exceeding 380 cSt.
HFO scrubber X124. Dredging Industry and Reclamation Contractors
Exhaust gas cleaning system retrofitted to many dredger newbuilds for IMO 2020 compliance.
HFO settling tank B2. Marine Engineering
Tank where heated HFO settles before purification.
HFO transfer log X19. Engine Room Watchkeeping and UMS Operations
Internal fuel movement record cross referenced with the Oil Record Book Part I.
HFO-513A (R513A) X26. Reefer Containers and Cold Chain Logistics
HFO/HFC blend, GWP 631, R134a replacement.
HFOM X31. Helicopter Operations on Ships
Helicopter Fuel On-board Monitoring, accurate fuel quantity indication system.
HFR (High-Friction Rubber Mat) X9. Cargo Securing, Lashing and Stability Vocabulary
Anti-skid material with mu of approximately 0.6.
HFRR test X61. Marine Lubricants and Cylinder Oils
High Frequency Reciprocating Rig wear scar measurement, primarily a fuel lubricity method but referenced in oil studies.
HFW X114. Maritime Arbitration and Shipping Law Firms
Holman Fenwick Willan, London-headquartered international shipping firm founded in 1883 with 16 offices.
HFW US X157. Marine Loss Adjusters, GA Practice, and Casualty Firms
New York and Houston-based US offices of Holman Fenwick Willan providing maritime, energy, and trade dispute services.
HH-60 Pave Hawk X80. Maritime Search and Rescue Coordination
Sikorsky combat SAR helicopter used by US Air Force pararescue.
HHI X58. Shipbuilding Yards and Construction
HD Hyundai Heavy Industries, the Ulsan flagship yard of the HD Hyundai group.
HHI propeller works X38. Propellers, Stern Gear and Shaft Lines
Hyundai Heavy Industries propeller foundry and CFD group producing large bronze propellers.
HHIC Insurance X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets
Hyundai Heavy Industries captive insurer.
HHLA Altenwerder X169. Container Terminal Cranes, Yard Equipment, and Lashing
Hamburg container terminal that pioneered AGV operation alongside ASCs, opened in 2002.
HHLA International X138. Global Container Terminal Operators and Port Equipment
HHLA's international arm operating Odessa CTO, Tallinn Muuga and Trieste PLT.
HHM Hafenempfang X119. Maritime Conferences, Trade Shows and Awards
Hamburg port reception held annually each February by Hafen Hamburg Marketing.
HHO X31. Helicopter Operations on Ships
Helicopter Hoist Operation, winching personnel without landing on deck.
HHP Anchor X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral
High-holding-power anchor that develops at least twice the holding power of an equivalent ordinary stockless anchor when tested per IACS UR A1.
HHV (Higher Heating Value) X149. Marine Fuels, Bunkering, and Alternative Fuels
The gross calorific value of a fuel including the latent heat of water vapor produced during combustion.
HHWS X33. Inland Navigation and Barge Operations
Hochstwasserstand, highest navigable water level on German waterways above which navigation is closed.
Hi Force X59. Offshore Wind O&M, CTVs and SOVs
Hydraulic equipment supplier providing tensioning, torquing, and cable repair tools to the offshore wind sector.
Hi mom switch X19. Engine Room Watchkeeping and UMS Operations
Stick switch on manoeuvering platform for emergency stop on some MAN B&W layouts.
Hi-build epoxy X45. Marine Paints, Coatings and Antifouling
Epoxy coating formulated to apply at 200 to 500 micrometers per coat.
Hi-Hi Level Alarm X20. LNG Operations and Custody Transfer
98.5 percent or as set by IGC; auto-trip of loading via ESD.
Hi-Pot Test X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
High-potential dielectric test applied to submarine power cables after installation to verify insulation integrity.
Hi-Sprint X60. Marine Salvage and Wreck Removal
Vikoma rapid response oil spill recovery system designed for fast water deployment.
HiAmmonia Project X140. Ammonia as Marine Fuel and Hydrogen Shipping
Hyundai-led K-Yard demonstration of dual-fuel ammonia engines at Ulsan from 2025.
HiBallast (Hyundai) X18. Ballast Water, Biofouling and Antifouling
Filtration plus electrolysis BWMS by Hyundai Heavy Industries.
Hibernia Express X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
4,600 km low-latency transatlantic submarine cable from Halifax to Brean, UK, in service since 2015.
Hibernia, RMS X39. Pre-1900 Maritime History
Cunard paddle steamer of 1843 serving the Liverpool to Boston route.
Hibiki X123. Offshore Wind Installation Vessels and Operators
Penta-Ocean Construction Japanese jack-up vessel, used for Akita and Noshiro offshore wind projects.
HiBOG Mode X20. LNG Operations and Custody Transfer
Operating mode where vaporizer or engine load is increased to consume excess BOG and avoid GCU use.
HiCS X107. Maritime Cybersecurity and OT Security
Hyundai Integrated Smart Vessel control system used on Hyundai Heavy Industries newbuildings.
Hidromek X124. Dredging Industry and Reclamation Contractors
Turkish builder of small backhoe-on-pontoon dredgers for inland water bodies.
Hierarchy of certificates X21. STCW Certificates, Crewing and Seafarer Welfare
STCW structure from rating CoP through OOW, Chief Mate, and Master.
Higaki Shipbuilding X113. Drydock and Ship Repair Yards
Japanese shipbuilder in the Imabari area producing small to medium dry cargo vessels.
High and dry X3. Ship Handling, Seamanship and Deck Vocabulary
Aground above the waterline.
High Availability X48. Maritime Cybersecurity
Design objective for shipboard systems requiring minimal downtime.
High BN cylinder oil X61. Marine Lubricants and Cylinder Oils
Cylinder lubricant with Base Number of 100 or above formulated for high-sulfur residual fuel operation.
High Consequence Dangerous Goods X75. IMDG Code, Classes, Packing and Segregation
Subset of substances in IMDG 1.4.3.1 with potential for severe consequences if misused, with stricter security obligations.
High Consequence Dangerous Goods (HCDG) X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers
Goods identified in 1.4.3 as potentially attractive for terrorist misuse, e.g., Division 1.1 above 50 kg, Class 6.2 Category A, and Class 7 of Type B(M)/C.
High Court Admiralty Action in Rem X51. Maritime Arbitration, Law and BIMCO Clauses
An action against the offending ship as defendant, initiated by the issue of an in rem claim form.
High Court of Admiralty (historical) X163. Marine Accident Investigation Agencies and Landmark Inquiries
English judicial body that historically conducted Wreck Commissioner inquiries before the modern MAIB framework.
High cube X6. Container, Intermodal and Trade Codes
Container with 9 ft 6 in external height, code suffix HC.
High Cube 40 Reefer X83. ISO Container Manufacturing and Leasing
40-foot high-cube integral reefer container, the dominant reefer size in service.
High Cube Module X104. Project Cargo Forwarders and Heavy Transport
Project module with overall height exceeding standard transport envelopes.
High Density Cargo X1. Cargo Science, Commodities and Cargo Care
Heavy bulks with small stowage factors (iron ore 0.3-0.4 m3/t).
High Density Cell X73. Marine Hydrography, Charting and ENC
An informal term for ENCs with rich object content typical of harbour and berthing scales.
High Holding Anchor Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations
Specialized pilot grade authorized to advise vessels using emergency anchoring in narrow channels.
High Holding Power X79. Tugs and Towage Industry
Anchor characteristic relevant to AHTS work, certified by class society type approval.
High Holding Power Anchor X5. Marine Surveying and Inspection
Anchor type whose certification is checked during anchor surveys.
High level alarm X19. Engine Room Watchkeeping and UMS Operations
Tank level alarm preventing overflow, with separate high high overfill alarm on bunker tanks.
High Liner Foods X131. Commercial Fisheries, Trawler Fleets and Seafood Processors
Halifax, Nova Scotia-based North American frozen seafood processor.
High Performance Series X61. Marine Lubricants and Cylinder Oils
ExxonMobil Mobilgard HPS designation for cylinder oils targeting residual-fuel two-stroke engines.
High Potential Anode X100. Marine Cathodic Protection and Anodes
An anode chemistry, typically magnesium, with a more negative closed-circuit potential than standard zinc or aluminum.
High pressure X16. Nautical Science, Navigation and COLREGs
Region of pressure higher than its surroundings; anticyclone.
High pressure dual-fuel (HPDF) X34. Decarbonization, Alternative Fuels and Carbon Pricing
Engine category including MAN ME-GI; reduces methane slip versus low-pressure designs.
High Pressure Nervous Syndrome X82. Saturation Diving and Offshore Diving Operations
HPNS, a neurological disorder appearing on heliox below about 180 m.
High Pressure Tank X83. ISO Container Manufacturing and Leasing
T75 portable tank for liquefied gas under pressure.
High Risk Area X22. Piracy, Maritime Security and Armed Protection
BMP designated maritime zone where piracy attacks have occurred and additional measures are recommended.
High Risk Area (HRA) E1. Maritime security, geopolitics and risk
Industry-designated piracy zone; Indian Ocean HRA removed Jan 2023.
High Risk Area Gulf of Guinea X127. Maritime Security, Anti-Piracy and PMSCs
Industry-defined area covering waters of Nigeria, Benin, Togo, Cameroon and Equatorial Guinea, recognized in BMP West Africa.
High Risk Area Indian Ocean X127. Maritime Security, Anti-Piracy and PMSCs
Voluntary self-reporting area established 2010, contracted in stages and removed effective 1 January 2023 by the joint industry letter.
High Risk Ship X7. Flag State, Port State Control and Detention Vocabulary
HRS under Paris MoU New Inspection Regime, prioritized for expanded inspection every 5 to 6 months.
High Seas A6. Public international law of the sea
Waters beyond the EEZ under UNCLOS Part VII.
High Seas (UNCLOS) X34. Decarbonization, Alternative Fuels and Carbon Pricing
Area beyond national jurisdiction; emissions from voyages to or from EU ports counted at 50% under EU ETS.
High Seas Boarding and Inspection X87. Fishing Vessels and Fisheries Management
Regime under the UN Fish Stocks Agreement 1995 and several RFMOs allowing inspection of fishing vessels on the high seas.
High Seas Fishing Authorization X87. Fishing Vessels and Fisheries Management
License issued by a flag state under the FAO Compliance Agreement 1993 for vessels fishing on the high seas.
High Seas Fleet F1. Maritime History
Imperial German Navy battle fleet of the First World War.
High Seas SAR X80. Maritime Search and Rescue Coordination
SAR operations outside any coastal state's territorial sea.
High Speed Craft X75. IMDG Code, Classes, Packing and Segregation
Vessels regulated under the HSC Code, with restrictions on dangerous goods carriage.
High Speed Craft Code X54. Naval Architecture Software and IACS Rules
IMO HSC Code addressing safety standards for craft operating above conventional speed thresholds.
High Speed Diesel (HSD) X2. Marine Bunker Fuels, Lubricants and Bunkering Operations
Distillate used by high-speed engines, similar to road diesel.
High speed shaft X59. Offshore Wind O&M, CTVs and SOVs
Output shaft of the turbine gearbox driving the generator, subject to alignment and bearing inspection.
High suction X19. Engine Room Watchkeeping and UMS Operations
Upper bilge or tank suction used when low suction is fouled.
High Sulfur Fuel Oil X115. Marine Bunker and Cargo Surveying
Residual fuel exceeding 0.50 percent sulfur, used only with approved exhaust gas cleaning systems under MARPOL Annex VI.
High Sulfur Fuel Oil (HSFO) X69. EGCS Scrubbers, SCR and Marine Air Emissions
Residual fuel typically at 3.5% sulfur historically used with scrubbers.
High Sulphur Fuel Oil (HSFO) X44. Shipping Indices, FFAs and Freight Markets
Residual marine fuel whose price differential to VLSFO informs scrubber-fitted vessel earnings inputs in TCE calculations.
High tensile steel X58. Shipbuilding Yards and Construction
Structural steel of yield strength typically 315 to 460 MPa used for hull plating.
High Throughput Satellite X68. Maritime Satcom and Telecommunications
Geostationary platform using narrow spot beams and frequency reuse to multiply capacity.
High Tide Beaching Window X28. Ship Recycling and End-of-Life
Spring tide period when deepest-draft vessels can be beached at Alang or Chittagong.
High Tide Flooding D5. Coastal processes, sea-level, cryosphere and ocean observation science
Recurrent coastal flooding at predictable high tides, also called sunny day flooding.
High Viscosity Substance (Annex II) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary
A noxious liquid substance with a viscosity equal to or greater than 50 mPa.s at the unloading temperature, requiring prewash under Reg 13.
High voltage alternating current X42. Offshore Wind Installation and Cable Lay
Transmission technology used for most offshore wind export systems under approximately 100 km cable length.
High voltage direct current X42. Offshore Wind Installation and Cable Lay
Transmission technology used for long offshore wind export cable connections such as Dogger Bank and German North Sea clusters.
High Voltage Direct Current (HVDC) Submarine Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
Bulk power transmission cable using direct current, preferred over HVAC for long submarine routes due to lower charging losses.
High Voltage Shore Connection X67. Marine Electrical Systems and Shore Power
Berth-side equipment that supplies HV shore power to ships in accordance with IEC/IEEE 80005-1.
High Voltage Simulator X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment
STCW A-III/6 high-voltage operations trainer for electro-technical officers.
High Voltage Survey X43. Marine Surveying and Warranty Surveying
A specialist electrical inspection of medium and high voltage systems on cruise ships, LNG carriers, and offshore units.
High Voltage Switchgear Decommissioning X50. Ship Recycling, Demolition and Hong Kong Convention
The de-energization, lockout, and removal of medium and high voltage switchgear, with SF6 gas recovery where applicable.
High voltage training X21. STCW Certificates, Crewing and Seafarer Welfare
STCW Table A-III/2 competence for engineers on systems above 1000 V.
High water (HW) X16. Nautical Science, Navigation and COLREGs
Maximum height reached by a rising tide.
High Water Full and Change D2. Hydrography, tides, waves, bathymetry and marine geology
Time of high water at full and new moon, related to tidal phase.
High-Build Epoxy X88. Marine Surface Preparation and Coatings Application
Epoxy coating formulated to be applied in single coats of 200 to 500 micrometers DFT.
High-Cube (HC) X46. Container Terminal Operations
A container 9 feet 6 inches in external height, one foot taller than a standard ISO container.
High-cube reefer X70. Reefer Containers and Cold Chain Shipping
40-foot or 45-foot reefer container with internal height of approximately 2.55 meters, predominant in ocean reefer trades.
High-Duty (HD) Compressor X20. LNG Operations and Custody Transfer
BOG compressor handling large flows during loading vapor return.
High-Endurance Cutter E2. Naval, defence and maritime law enforcement
USCG large cutter class (e.g., Legend/National Security Cutter).
High-Focal-Plane Buoy X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation
Tall pillar buoy with elevated lantern, used in deep water.
High-Latitude Operation X133. Polar Research Vessels and Polar Code Regimes
Polar Code defined as operation above 60 degrees South or in Arctic waters delineated in MARPOL.
High-mast lighting X15. Ports, Terminals and Stevedoring
30 m or taller mast illuminating yards.
High-pressure cut-out X26. Reefer Containers and Cold Chain Logistics
Safety pressure switch shutting down compressor on overpressure.
High-Pressure Cylinder X63. Marine Auxiliary Machinery and Pumps
Second-stage cylinder of a reciprocating air compressor delivering air to the receiver.
High-pressure fuel pump X47. Marine Fuel Quality and ISO 8217
Engine-driven plunger pump delivering fuel to injectors at injection pressure, sensitive to viscosity and cat fines.
High-Pressure Pipe X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring
Common-rail or jerk-pump fuel pipe rated for above 600 bar, inspected for cracks and double-wall integrity each overhaul.
High-Pressure Pump (Onshore) X20. LNG Operations and Custody Transfer
Vertical multistage submerged pump (Ebara, Nikkiso) raising LNG to send-out pressure (60 to 100 bar).
High-pressure water mist X24. Cruise, Passenger Ship and Ferry Operations
SOLAS II-2 fixed fire-extinguishing system widely used on passenger ships.
High-Risk Area Transit X40. Tanker Vetting, SIRE and VIQ
Passage through an IMB- or industry-designated piracy area, reviewed under VIQ security and navigation chapters.
High-Risk Jurisdiction X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes
A country listed by FATF, OFAC, or the EU as presenting elevated illicit-finance risk, mapped onto maritime due-diligence frameworks.
High-sided ship pilotage X32. Marine Pilotage and Pilot Operations
Special procedures for container ships and car carriers presenting large windage area to the pilot.
High-skew propeller X38. Propellers, Stern Gear and Shaft Lines
Propeller with skew angle typically exceeding 25 degrees, used to reduce blade-rate forces and cavitation impact.
High-Speed Craft (HSC) Code A2. Maritime safety legislation: SOLAS and its codes
1994 HSC Code and 2000 HSC Code, mandatory under SOLAS X.
High-Speed Craft (HSC) Type Rating X160. Maritime Academies, Universities, and STCW Certification
STCW A-V/2 type-specific training for masters and officers serving on craft built to the IMO HSC Code.
High-Speed Craft Code (HSC Code) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary
1994 HSC Code (MSC.36(63)) for craft built before 1 July 2002 and 2000 HSC Code (MSC.97(73)) for craft built on or after that date, mandatory under SOLAS X/3.
High-Speed Separator X63. Marine Auxiliary Machinery and Pumps
Disc-stack centrifuge running at very high g-force for efficient fuel and lube oil cleaning.
High-temperature jacket water B2. Marine Engineering
Cooling circuit at ~85-90 °C around cylinder jackets.
High-temperature Machine X41. Cruise Ship Public Health and VSP/USPH
Dishwasher relying on hot water at 71 C (160 F) at the plate surface for sanitization.
High-Velocity Vent Valve X93. IBC Code and Chemical Tanker Operations
Tank vent designed to discharge vapor at a minimum 30 m/s exit velocity to ensure dispersion away from the deck.
High-Voltage Holiday Detector X88. Marine Surface Preparation and Coatings Application
Spark testing instrument typically operating at 800 to 30,000 volts DC used to detect discontinuities in tank linings and pipeline coatings thicker than 500 micrometers per ASTM D5162 Type II and…
High-Voltage Safety Procedure X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA
The TMSA-aligned procedure for vessels with HV switchgear, verified by SIRE 2.0 inspectors.
High-Voltage Switchboard Operation Course X55. Marine Simulators, Training and Maritime Academies
STCW Regulation III/2 course covering safe operation of marine high-voltage installations.
Higher Engineering School of the Merchant Navy Bilbao X121. Maritime Education, Academies and Universities
Escuela Tecnica Superior de Nautica y Maquinas Navales at the University of the Basque Country.
Highspeed 4 X132. High-Speed Craft, Hydrofoils and Ferry Operators
Incat 81 m wave-piercer of Hellenic Seaways serving Piraeus and the Cyclades.
Highspeed 7 X132. High-Speed Craft, Hydrofoils and Ferry Operators
Austal 99 m built 2014 for Hellenic Seaways on the Heraklion route.
Hightown X123. Offshore Wind Installation Vessels and Operators
UK landfall location for Burbo Bank wind farm cable installation.
Hijack for Ransom X22. Piracy, Maritime Security and Armed Protection
Pirate business model dominant off Somalia between 2008 and 2012 involving capture of vessel and crew.
Hijos de J. Barreras X137. Harbour Tugs, Towage Operators and Tug Builders
Vigo shipyard which has delivered tugs for Iberian operators.
Hike Metal Products X94. Port Machinery and Quay Equipment Makers
Canadian aluminum boat builder of pilot launches and crew boats based in Wheatley, Ontario.
Hiking X84. Yacht Racing, Regattas and Sailing Governance
Crew members leaning their weight outboard to counter heel.
Hill Dickinson X114. Maritime Arbitration and Shipping Law Firms
Liverpool-headquartered firm with shipping disputes offices in London, Piraeus, Monaco, Singapore, and Hong Kong.
Hill Dickinson LLP X157. Marine Loss Adjusters, GA Practice, and Casualty Firms
UK law firm with substantial marine insurance, P&I, and cargo claims practice based in Liverpool and London.
Hill Harmony, The [2001] 1 AC 638 X143. Landmark Maritime Law Cases and Doctrines
House of Lords held that a master must obey charterers' legitimate routing orders absent navigational reason to refuse.
Hill Robinson X35. Yacht and Superyacht Industry
Antibes and Monaco-based yacht management firm founded 1999.
Hilli Episeyo X134. LNG and LPG Carrier Operators and Containment Systems
FLNG converted from 1975 Moss LNG carrier, deployed Cameroon for Perenco, capacity 2.4 mtpa.
Himalaya Clause A5. Maritime Law, private and commercial
Bill of lading clause extending carrier defenses to servants and subcontractors.
HiMSEN X67. Marine Electrical Systems and Shore Power
Family of medium-speed four-stroke engines from Hyundai Heavy Industries widely used as marine auxiliary and main engines.
HiMSEN H21 X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring
HSD Engine (formerly Hyundai HiMSEN) 210 mm bore medium-speed engine widely used as marine genset.
Himsen H21/32 B2. Marine Engineering
Hyundai Heavy Industries medium-speed engine family.
HiMSEN H22/32 Methanol X111. Methanol, Ammonia and Alternative Marine Fuels
Hyundai Heavy Industries medium-speed methanol-fueled engine variant in the HiMSEN H22/32 series.
HiMSEN H32 X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring
HSD Engine 320 mm bore medium-speed engine used in marine auxiliary and small propulsion applications.
HiMSEN H35 X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring
HSD Engine 350 mm bore engine for medium-power marine main propulsion and large auxiliary duty.
Hin Leong Trading X72. Bunkering Hubs and Bunker Suppliers
Singapore fuel oil supplier whose 2020 collapse exposed roughly 4 billion US dollars in undisclosed losses and led to founder OK Lim's conviction.
HiNAS X109. Maritime Autonomous Surface Ships and MASS Code
Hyundai Intelligent Navigation Assistant, the Avikus autonomous navigation product line for large commercial vessels.
HiNAS 2.0 X109. Maritime Autonomous Surface Ships and MASS Code
The second generation Avikus autonomous navigation system used for the Stella Maris transatlantic demonstration.
Hindcast D1. Physical and chemical oceanography and marine meteorology
Model reconstruction of past conditions using observed forcing.
Hindcast ice X27. Polar Code, Ice Navigation and Polar Operations
Reanalysis of historical ice conditions for design and route planning.
Hindcast Wave Data X96. Hull Integrity Monitoring and Strain Gauges
Historical wave parameters reconstructed from numerical models for operational and design analysis.
Hindustan Institute of Maritime Training X55. Marine Simulators, Training and Maritime Academies
DGS-approved institute in Chennai offering pre-sea ratings and modular STCW courses.
Hindustan Institute of Maritime Training (HIMT College) X160. Maritime Academies, Universities, and STCW Certification
Indian DG Shipping approved private maritime training institute in Chennai founded in 1995.
Hindustan Shipyard X58. Shipbuilding Yards and Construction
Indian state shipbuilder at Visakhapatnam, the country's first shipyard.
Hinge Lug X83. ISO Container Manufacturing and Leasing
Welded lug receiving the hinge pin of a container door.
Hinge restraint X42. Offshore Wind Installation and Cable Lay
Mechanical feature limiting bending at the top of a dynamic cable hang off.
Hinkley Point C X104. Project Cargo Forwarders and Heavy Transport
UK nuclear power project where the Sarens SGC-250 ring crane is deployed.
HiPAP X20. LNG Operations and Custody Transfer
Sonar-based position reference on DP FSRUs and shuttle LNGCs.
HiPAP 351 X65. ROVs, AUVs, USVs and Marine Robotics
Mid-range Kongsberg HiPAP transducer head for shallow to medium water positioning.