Glossary

Maritime glossary, terms beginning with H (page 6)

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

Showing 250 of 1949 terms (page 6 of 8).

Holystone F1. Maritime History: Sandstone block used to scour wooden decks during the age of sail.
HOMC (Heads of Maritime Administrations) X146. Port State Control Regimes, MoUs, and Inspection Systems: The Tokyo MoU governing body comprising heads of maritime safety administrations of member authorities.
Home In X80. Maritime Search and Rescue Coordination: SRU maneuver toward a radio beacon using direction finding.
Homeport X24. Cruise, Passenger Ship and Ferry Operations: Port at which a cruise itinerary turns around.
Homer Equipment X80. Maritime Search and Rescue Coordination: Direction finding equipment installed on SAR aircraft and vessels.
Homer, Winslow F2. Maritime Culture, Heritage, Archaeology, Art and Museums: American marine and seascape painter, 1836 to 1910.
Homing Signal X95. GMDSS Equipment and Survival Craft Communications: 121.5 MHz auxiliary signal transmitted by 406 MHz EPIRBs and PLBs used by SAR aircraft and vessels for direction finding at close range.
Homogeniser X47. Marine Fuel Quality and ISO 8217: In-line device using shear or ultrasonic energy to disperse asphaltenes and reduce settling in residual fuel.
Honda Heavy Industries X58. Shipbuilding Yards and Construction: Japanese shipbuilder at Saiki, Oita, building chemical tankers and small vessels.
Hondius X97. Polar Expedition Cruise and IAATO Operations: Oceanwide Expeditions ship delivered in 2019 with 174 PAX, marketed as the first vessel built to Polar Class 6 specifically for polar tourism.
Honduras Bureau of Shipping X98. Ship Registries and Flag States: Open registry of the Republic of Honduras administered by HBS.
Honduras Flag X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: A Central American registry historically named in dark-fleet and substandard-tonnage reporting.
Honey (Provisions) X120. Marine Catering, Provisions and Ship Chandlers: IMPA 550816 1 kg jar, ambient store.
HoneyNet X25. Maritime Cybersecurity, OT and IT: Network of decoy systems used to study attacker behavior.
Honeypot X48. Maritime Cybersecurity: Decoy system used to attract attackers and learn their techniques.
Honeypot (OT) E1. Maritime security, geopolitics and risk: Decoy system used to detect intrusion attempts.
Honeywell Experion X107. Maritime Cybersecurity and OT Security: Process control system from Honeywell used in petrochemical and some marine applications.
Honeywell Marine Systems X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Heritage supplier of marine fiber-optic gyros and inertial heading references including the BTG-3.
Honeywell Sensotec X96. Hull Integrity Monitoring and Strain Gauges: Legacy Honeywell brand for force, pressure, and load measurement transducers.
Honfleur X85. Ferries, Ro-Pax Operators and Routes: Brittany Ferries LNG dual-fuel ro-pax originally contracted as Honfleur for Portsmouth to Caen.
Hong Kong X24. Cruise, Passenger Ship and Ferry Operations: Asian cruise homeport at Kai Tak Cruise Terminal and Ocean Terminal.
Hong Kong Admiralty Court X51. Maritime Arbitration, Law and BIMCO Clauses: The specialist court of the Court of First Instance of Hong Kong hearing maritime claims.
Hong Kong Arbitration Ordinance X114. Maritime Arbitration and Shipping Law Firms: Cap 609 of 1 June 2011 governing arbitrations seated in Hong Kong.
Hong Kong Arbitration Ordinance (Cap 609) X152. Maritime Arbitration and Dispute Resolution: Hong Kong statute based on the UNCITRAL Model Law with modifications, governing arbitrations seated in Hong Kong.
Hong Kong as seat X152. Maritime Arbitration and Dispute Resolution: Recognized neutral seat in Asia for maritime arbitration, benefiting from the New York Convention and a pro-arbitration judiciary.
Hong Kong Bunker Anchorage X86. Port Agency, Husbandry and Disbursement: Designated anchorage off Hong Kong used for bunkering operations.
Hong Kong bunker hub X149. Marine Fuels, Bunkering, and Alternative Fuels: A long-established bunker port supplying VLSFO and MGO in South China.
Hong Kong Bunkering X72. Bunkering Hubs and Bunker Suppliers: Bunker supply at Hong Kong waters by Chimbusco Pan Nation, Brightoil HK, and Sinopec Hong Kong.
Hong Kong Convention A4. Other IMO and ILO conventions and codes: International Convention for the Safe and Environmentally Sound Recycling of Ships, 2009, in force 26 June 2025.
Hong Kong Convention (HKC) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: 2009 Hong Kong Convention on Ship Recycling (in force 26 June 2025).
Hong Kong Convention 2009 X143. Landmark Maritime Law Cases and Doctrines: IMO International Convention for the Safe and Environmentally Sound Recycling of Ships, in force 26 June 2025.
Hong Kong Convention Article 1 X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Establishes the general obligation to give full and complete effect to the Convention to prevent, reduce, and minimize adverse effects of ship recycling.
Hong Kong Convention Article 6 X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Requires ships destined for recycling to carry only those activities incidental to delivery to the recycling facility, including the issuance of the IRRC.
Hong Kong Convention Article 8 X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Sets the survey scheme, including initial, renewal, additional, and final surveys leading to the IHM and IRRC certificates.
Hong Kong Convention Article 9 X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Governs the authorization of Ship Recycling Facilities by Recycling States.
Hong Kong Convention Entry into Force X28. Ship Recycling and End-of-Life: 26 June 2025, twenty-four months after the conditions of Article 17 were met by Bangladesh, Liberia, and Pakistan ratifications in June 2023.
Hong Kong Convention Regulation 9 X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Requires every ship to carry an Inventory of Hazardous Materials maintained throughout its operational life.
Hong Kong Fir Shipping Co Ltd v Kawasaki Kisen Kaisha [1962] 2 QB 26 X143. Landmark Maritime Law Cases and Doctrines: English Court of Appeal introduced the innominate term doctrine.
Hong Kong Gold Coast Boat Show X35. Yacht and Superyacht Industry: Annual yacht show on Hong Kong's Gold Coast.
Hong Kong Half-Rate Profits Tax X98. Ship Registries and Flag States: Hong Kong concessionary tax regime for qualifying ship lessors and ship leasing managers.
Hong Kong Insurance Authority (HKIA) X117. Marine Insurance Markets, Captives and Reinsurance: Regulator of Hong Kong's insurance market, including captives under the captive insurance regime.
Hong Kong International Airport X124. Dredging Industry and Reclamation Contractors: Chek Lap Kok original reclamation 1992-1998 used 70 dredgers; third runway 2016-2023 added 650 ha.
Hong Kong International Arbitration Centre X114. Maritime Arbitration and Shipping Law Firms: Institution founded in 1985 administering shipping arbitrations from Exchange Square.
Hong Kong International Arbitration Centre (HKIAC) X51. Maritime Arbitration, Law and BIMCO Clauses: A leading institutional administrator of arbitrations seated in Hong Kong, including maritime disputes.
Hong Kong International Convention X118. Ship Recycling Yards, Beaches and Regulation: Full title is the Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships, 2009 (HKC).
Hong Kong Kai Tak Cruise Terminal X164. Cruise Industry, Brands, Ship Classes, and Terminals: The cruise terminal built on the runway of the former Kai Tak Airport, opened in 2013.
Hong Kong MAIS X12. Maritime Casualties and Investigation: Marine Accident Investigation Section of the Marine Department of Hong Kong SAR.
Hong Kong MARDEP MAIS (Marine Accident Investigation Section) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Marine Accident Investigation Section of the Hong Kong Marine Department which discharges the Hong Kong flag State investigation function for Hong Kong-registered ships.
Hong Kong Marine Department X98. Ship Registries and Flag States: Flag administration of the Hong Kong Special Administrative Region, responsible for the Hong Kong Shipping Register.
Hong Kong Mariners' Club X102. Seafarer Welfare and Maritime Charities: Operator of The Mariners' Club Hong Kong, a multi-faith seafarers' center in Tsim Sha Tsui.
Hong Kong Maritime and Port Board F3. Seafaring Life, Education, Professions and Institutions: Hong Kong industry promotion body.
Hong Kong Maritime Arbitration Group (HKMAG) X51. Maritime Arbitration, Law and BIMCO Clauses: An association promoting and supporting maritime arbitration in Hong Kong.
Hong Kong Maritime Cluster F3. Seafaring Life, Education, Professions and Institutions: Long-established Asian maritime services hub.
Hong Kong Maritime Museum Education Programme X121. Maritime Education, Academies and Universities: Public maritime education outreach in Central, Hong Kong, complementing university provision.
Hong Kong Maritime Services Training Institute (MSTI) X160. Maritime Academies, Universities, and STCW Certification: Hong Kong Vocational Training Council institute on Cheung Chau delivering officer and rating courses for the Hong Kong flag.
Hong Kong Maritime Week X119. Maritime Conferences, Trade Shows and Awards: Annual programme launched 2015 by the Hong Kong Maritime and Port Board.
Hong Kong MRCC X80. Maritime Search and Rescue Coordination: Maritime Rescue Coordination Centre operated by the Hong Kong Marine Department.
Hong Kong Pilots X32. Marine Pilotage and Pilot Operations: Members of the Hong Kong Pilots Association serving Victoria Harbour and approaches under compulsory pilotage.
Hong Kong Polytechnic University Department of Logistics and Maritime Studies X121. Maritime Education, Academies and Universities: LMS at PolyU, Hung Hom, founded 1991, offers BBA in International Shipping and Transport Logistics.
Hong Kong Provisioning X120. Marine Catering, Provisions and Ship Chandlers: Major Asian hub served by Sembawang, Sims Trading, and Far East Marine Supply chandlers.
Hong Kong PSC X66. Port State Control and Regional MOUs: Tokyo MOU member; PSC conducted by Hong Kong Marine Department.
Hong Kong Shipping Register X98. Ship Registries and Flag States: SAR register opened in 1990 with approximately 140 million GT and 2,800 vessels.
Hong Kong United Dockyards X113. Drydock and Ship Repair Yards: Joint venture ship repair operator at Tsing Yi, Hong Kong, established between Hutchison and Swire interests.
Hong Kong, China X7. Flag State, Port State Control and Detention Vocabulary: Major flag administered by the Hong Kong Marine Department, among the world's top five by tonnage.
Hong Lam Marine X72. Bunkering Hubs and Bunker Suppliers: Singapore licensed bunker supplier operating one of the larger MPA accredited barge fleets.
Hong Merchants X39. Pre-1900 Maritime History: Cantonese guild that monopolized European trade at Canton under the Qing system until 1842.
Honiara X122. Submarine Cable Laying, Repair Vessels and Operators: Solomon Islands landing point for Coral Sea Cable System with shallow water repair access via the CS Reliance.
Honolulu X122. Submarine Cable Laying, Repair Vessels and Operators: Hawaii landing hub for SEA-US, JUPITER, HIC, AAG and Hawaiki, with Sand Island BMH at the core.
Honorary Chaplain X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Volunteer port chaplain appointed under the Mission to Seafarers or Stella Maris in smaller ports.
Honour Policy X4. Marine Insurance, P&I and Claims: policy without insurable interest, void under section 4 of the Marine Insurance Act 1906.
Honourable Company of Master Mariners X121. Maritime Education, Academies and Universities: London-based livery company founded 1926, granted livery status 1932, custodian of professional standards for British Merchant Navy masters, owners of HQS Wellington until 2022.
Honshu-Shikoku HVDC X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Japanese DC interconnector across the Kii Channel between Honshu and Shikoku islands.
Hood Sails F4. Recreational Boating, Yachting and Sport: US sailmaker founded 1952.
Hooghly River X39. Pre-1900 Maritime History: Distributary of the Ganges and the maritime approach to Calcutta, surveyed by the East India Company from the seventeenth century.
Hook X3. Ship Handling, Seamanship and Deck Vocabulary: Slang for the anchor.
HOOK (Hydrographic Office Operations Kit) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Internal toolset used at UKHO for distributing product updates.
Hook (QRH) X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Steel hook in a Quick Release Hook battery that holds a mooring eye and can be released hydraulically or manually under load.
Hook Block X169. Container Terminal Cranes, Yard Equipment, and Lashing: Bottom sheave block that carries the spreader headblock or a single hook on shipboard cranes.
Hook Block Capacity X104. Project Cargo Forwarders and Heavy Transport: Working load limit of a crane's main hook block in a given reeving configuration.
Hook Counter (Longline) X87. Fishing Vessels and Fisheries Management: Mechanical device recording hooks deployed for logbook reporting under RFMO requirements.
Hook Load X14. Offshore Oil and Gas Marine Operations: Weight suspended from the drilling hook.
HOPE project X57. Ocean Energy Beyond Wind: European-funded study on hybrid ocean and platform energy concepts.
Hopkins and Bracewell X114. Maritime Arbitration and Shipping Law Firms: Reference to historic London admiralty solicitors.
Hoppe Marine HoppEnergy X78. Voyage Optimization and Vessel Performance Software: An energy efficiency monitoring system from Hoppe Marine integrating shaft power, fuel flow, and operational data for performance analysis.
Hopper X15. Ports, Terminals and Stevedoring: funnel-shaped container receiving bulk from grabs and feeding conveyors or trucks.
Hopper (bulk carrier) B1. Naval Architecture: Sloped lower wing structure forming cargo hold.
Hopper (Pelagic Trawler) X87. Fishing Vessels and Fisheries Management: Receiving tank where pumped catch is dewatered before grading.
Hopper barge C4. Ports, terminals and coastal/marine civil engineering: Self propelled or towed dredger spoil barge.
Hopper bin X175. Port Engineering, Dredging, Breakwaters, and Quays: Compartment within the hopper of a hopper dredger that contains the dredged spoil.
Hopper block X58. Shipbuilding Yards and Construction: Inclined hopper tank section in a bulk carrier including double bottom and side longitudinals.
Hopper coaming X124. Dredging Industry and Reclamation Contractors: Top edge of hopper, set above the loading line to retain overflow.
Hopper Container X75. IMDG Code, Classes, Packing and Segregation: Container with bottom discharge, used for some IMSBC and occasionally IMDG bulk solids.
Hopper draft X175. Port Engineering, Dredging, Breakwaters, and Quays: Vessel draft of a hopper dredger, which varies as the hopper fills and discharges.
Hopper Dredger E4. Cruise, offshore energy and auxiliary/specialised fleets: TSHD/THSD trailing-suction hopper dredger.
Hopper dredger (TSHD) B5. Ship Types and Individual Vessels: Trailing suction hopper dredger.
Hopper overflow X175. Port Engineering, Dredging, Breakwaters, and Quays: Controlled spill of excess slurry from the hopper of a TSHD during loading once the desired sand fraction is retained.
Hopper Side Tank Crack Monitoring X96. Hull Integrity Monitoring and Strain Gauges: Targeted inspection or instrumentation of bulk carrier hopper and side tank structures prone to fatigue cracking.
Hopper Tank Inspection X5. Marine Surveying and Inspection: Close-up survey of hopper structure in bulk carrier side tanks.
Hopper well X175. Port Engineering, Dredging, Breakwaters, and Quays: Open compartment in the deck of a TSHD that provides access to the hopper for loading and inspection.
Hopper, Bulk X1. Cargo Science, Commodities and Cargo Care: Funnel-shaped device on dock or in hold for loading/discharging bulk.
Horasis Global Meeting X119. Maritime Conferences, Trade Shows and Awards: Annual cross-sector forum with shipping panels held in Cascais, Portugal.
Horizon X16. Nautical Science, Navigation and COLREGs: Apparent line where Earth and sky meet; visible, sensible or celestial.
Horizon class X11. Naval Vessels, Warship Systems and Naval Architecture: Franco-Italian air defense destroyer with PAAMS and EMPAR.
Horizon Mask X68. Maritime Satcom and Telecommunications: Visual or digital map of obstructions that limit antenna look angles on a particular vessel.
Horizon Singapore Terminals X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: Joint venture of Hin Leong and partners, restructured following the Hin Leong collapse.
Horizon Sonar X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Klein Marine Systems towed side-scan model used by smaller survey vessels and naval mine countermeasures forces.
Horizon Yachts X125. Superyacht Industry, Builders and Brokers: Kaohsiung, Taiwan builder of FD and EP series motoryachts up to 50 m.
Horizon-class destroyer X106. Naval Surface Combatants: Franco-Italian air-defense destroyer class of four ships, two in French and two in Italian service.
Horizontal alignment C4. Ports, terminals and coastal/marine civil engineering: Plan alignment of a navigation channel.
Horizontal angle X16. Nautical Science, Navigation and COLREGs: Angle between two terrestrial objects in the horizontal plane.
Horizontal Datum X73. Marine Hydrography, Charting and ENC: WGS-84 is mandatory for ENC products under S-57 and S-101.
Horizontal Directional Drilling (HDD) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Trenchless landfall method drilling a borehole from shore to a wet exit beyond the surf zone to pull in cables or small pipelines.
Horizontal Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing parallel to deck.
Horizontal pressure test B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Tank hydrostatic test.
Horizontal Pump X63. Marine Auxiliary Machinery and Pumps: Pump with shaft axis horizontal, common on engine room cooling and transfer duties.
Horizontal sextant angle (HSA) X16. Nautical Science, Navigation and COLREGs: Position-fixing technique using two horizontal angles.
Hormuz, Strait of E1. Maritime security, geopolitics and risk: Persian Gulf chokepoint critical to oil exports.
Horn of Africa X22. Piracy, Maritime Security and Armed Protection: Maritime region including the Gulf of Aden, Somali Basin and approaches to the Bab-el-Mandeb.
Hornet Dinghy F4. Recreational Boating, Yachting and Sport: British two-person racing dinghy.
Horns Rev 1 X123. Offshore Wind Installation Vessels and Operators: 160 MW Danish wind farm commissioned 2002, Vattenfall operated, Vestas V80-2.0 turbines.
Horns Rev 2 X123. Offshore Wind Installation Vessels and Operators: 209 MW Danish wind farm commissioned 2009, Orsted operated, Siemens SWT-2.3-93 turbines.
Horns Rev 3 X123. Offshore Wind Installation Vessels and Operators: 407 MW Danish wind farm commissioned 2019, Vattenfall operated, 49 MHI Vestas V164-8.3 turbines.
Horns Rev export corridor X57. Ocean Energy Beyond Wind: Cable corridor in the Danish North Sea referenced in studies of integrated offshore hydrogen and CCS infrastructure.
Horns Rev I X105. Offshore Wind Farm Installation and Vessels: 160 MW Danish offshore wind farm in the North Sea developed by Vattenfall and commissioned in 2002.
Horns Rev II X105. Offshore Wind Farm Installation and Vessels: 209 MW Danish offshore wind farm developed by DONG Energy and commissioned in 2009.
Horns Rev III X105. Offshore Wind Farm Installation and Vessels: 407 MW Danish offshore wind farm developed by Vattenfall and commissioned in 2019.
Hornsea 1 X105. Offshore Wind Farm Installation and Vessels: 1.218 GW UK offshore wind farm in the North Sea developed by Ørsted and commissioned in 2019.
Hornsea 2 X105. Offshore Wind Farm Installation and Vessels: 1.32 GW UK offshore wind farm developed by Ørsted and commissioned in 2022.
Hornsea 3 X105. Offshore Wind Farm Installation and Vessels: 2.85 GW UK offshore wind farm developed by Ørsted with full commissioning targeted later this decade.
Hornsea 4 X105. Offshore Wind Farm Installation and Vessels: 2.6 GW UK offshore wind farm being developed by Ørsted as the fourth phase of the Hornsea zone.
Hornsea Four X42. Offshore Wind Installation and Cable Lay: UK offshore wind project under development by Orsted, currently subject to commercial reassessment.
Hornsea One X42. Offshore Wind Installation and Cable Lay: 1.2 GW UK offshore wind farm in the southern North Sea operated by Orsted.
Hornsea Three X42. Offshore Wind Installation and Cable Lay: UK offshore wind project under development by Orsted in the southern North Sea.
Hornsea Two X42. Offshore Wind Installation and Cable Lay: 1.32 GW UK offshore wind farm operated by Orsted, adjacent to Hornsea One.
Hornsea Wind Farms X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: UK offshore wind cluster off the Yorkshire coast with HVDC and HVAC export cables to Killingholme.
Horse X3. Ship Handling, Seamanship and Deck Vocabulary: Athwartship rail or rod on which a sheet block traverses.
Horse Latitudes D1. Physical and chemical oceanography and marine meteorology: Subtropical high-pressure belts near 30 degrees latitude with calm winds.
HOS-class supply vessel B5. Ship Types and Individual Vessels: Hornbeck offshore class.
Hosanna X128. Sail Training Ships and Tall Ship Associations: French heritage vessel cited in early sail training literature by Hilaire and Jeannine Cuny; Class B participation in early Cutty Sark races.
Hose Bib X41. Cruise Ship Public Health and VSP/USPH: Threaded tap, required to be protected by an atmospheric vacuum breaker if connected to potable water.
Hose Deployment X22. Piracy, Maritime Security and Armed Protection: BMP measure rigging fire hoses overside to deluge boarders.
Hose Recovery System X60. Marine Salvage and Wreck Removal: Pumping setup using floating hose from casualty to recovery vessel.
Hose Saddle X20. LNG Operations and Custody Transfer: STS handling fixture supporting cryogenic transfer hoses, often Trelleborg or Gutteling supply.
Hose Test X115. Marine Bunker and Cargo Surveying: Water hose application to hatch covers and weathertight closures to verify watertight integrity.
Hose Test Records X40. Tanker Vetting, SIRE and VIQ: The pressure-test records for cargo and bunker hoses examined under VIQ Chapter 8.
Hospital cabin X36. Shipboard Medical, Telemedicine and Seafarer Health: Dedicated isolation cabin under MLC Standard A4.1 for ships with 15+ crew on voyages over 3 days.
Hospital Clean X155. Marine Surveying Practice and Cargo Inspection: The highest hold cleanliness standard, requiring sound paintwork in good condition with no rust, no loose scale, and no residues, suitable for sensitive cargoes such as high grade kaolin or fluorspar.
Hospital Coordination X86. Port Agency, Husbandry and Disbursement: Agency arrangement of admission and treatment for crew at port hospitals.
Hospital ship X11. Naval Vessels, Warship Systems and Naval Architecture: Auxiliary, Hospital, AH, e.g., USNS Mercy T-AH-19.
Hospital Ships and Floating Hospitals F3. Seafaring Life, Education, Professions and Institutions: Mercy Ships and others.
Hospital Waste X75. IMDG Code, Classes, Packing and Segregation: UN 3291, Class 6.2 clinical waste, regulated waste subject to IMDG.
Hospitalisation Cover, Crew X117. Marine Insurance Markets, Captives and Reinsurance: Insurance for seafarer medical costs, typically arranged through a P and I club or specialist crew insurer.
Host Based Intrusion Detection System X48. Maritime Cybersecurity: Endpoint agent that inspects local activity for signs of compromise.
Hostage X127. Maritime Security, Anti-Piracy and PMSCs: Person held against will by pirates; ReCAAP and IMB classify incidents by hostage count and outcomes.
Hostage clause X152. Maritime Arbitration and Dispute Resolution: Informal term for a clause requiring substantial security before counterclaims can proceed; raises arbitrability and fairness concerns.
Hostage Crew Risk X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The operational concern that ransomware on bridge or engine systems may strand a vessel or trigger emergency response.
Hostage Negotiation E1. Maritime security, geopolitics and risk: Specialist crisis response in piracy/K&R incidents.
Hostess / Stewardess X35. Yacht and Superyacht Industry: Interior crew responsible for service, housekeeping, and guest experience.
Hostile Boarding Decoy X22. Piracy, Maritime Security and Armed Protection: Dummy or false target placed to mislead pirates as to crew location.
Hostile Cyber Event X109. Maritime Autonomous Surface Ships and MASS Code: A category in the MASS cyber threat model addressing intentional attacks on autonomy software or links.
Hostile Environment Survey X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Operations in ice, high-current, or piracy-prone areas, often using autonomous or unmanned systems coordinated with hydrographic offices.
Hostile Marine Operations Center X91. Submarines and Submarine Cable Systems: Generic term for cable operator centers monitoring threats to subsea infrastructure.
Hostler X15. Ports, Terminals and Stevedoring: alternative US term for a yard tractor.
Hostmen Bunker Service X72. Bunkering Hubs and Bunker Suppliers: Historic name for Newcastle upon Tyne coal bunkering predecessors to modern oil bunkering on the Tyne.
Hostomel X104. Project Cargo Forwarders and Heavy Transport: Ukrainian airport where the only Antonov An-225 Mriya was destroyed in February 2022.
Hot Corrosion X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Sulphidation attack on exhaust valve seats and turbocharger nozzle rings caused by sodium and vanadium compounds at elevated temperature.
Hot dip galvanizing X165. Marine Coatings, Antifouling, and Hull Husbandry: Zinc immersion coating used on bolts, ladders, and railings rather than on hull plating.
Hot exhaust shielding X19. Engine Room Watchkeeping and UMS Operations: Insulated lagging on exhaust components above 220 deg C per SOLAS II-2/4.
Hot filter test X47. Marine Fuel Quality and ISO 8217: Filtration check at elevated temperature used to detect sediment that precipitates during fuel heating.
Hot Hold X41. Cruise Ship Public Health and VSP/USPH: Maintenance of cooked food at 57 C (135 F) or above during display and service.
Hot Ironing D6. Decarbonization, emissions and alternative fuels: Generation of vessel power while berthed; antithesis of cold ironing.
Hot oil flushing X38. Propellers, Stern Gear and Shaft Lines: Pre-commissioning procedure circulating heated oil through stern-tube and lube-oil piping to remove debris.
Hot Pursuit A6. Public international law of the sea: Coastal-state right under UNCLOS Article 111.
Hot Pursuit (UNCLOS Art 111) E2. Naval, defence and maritime law enforcement: Pursuit doctrine across maritime zones into high seas.
Hot Refuel X31. Helicopter Operations on Ships: Refueling with rotors running and passengers offloaded.
Hot Rolled Coil X92. Marine Steel Suppliers and Shipbuilding Plate: HRC, flat steel rolled above recrystallization temperature and wound into coil form.
Hot Spot D2. Hydrography, tides, waves, bathymetry and marine geology: Mantle plume location producing intraplate volcanism.
Hot Spot Sampling X50. Ship Recycling, Demolition and Hong Kong Convention: The intrusive sampling of suspected ACM, PCB, or coating locations during the IHM development.
Hot Spot Stress X54. Naval Architecture Software and IACS Rules: Structural stress at a fatigue crack initiation site computed per CSR-BC+OT Chapter 9.
Hot stab X65. ROVs, AUVs, USVs and Marine Robotics: Hydraulic coupling deployed by an ROV manipulator into a subsea receptacle to transmit pressure for valve actuation or chemical injection.
Hot stowage X26. Reefer Containers and Cold Chain Logistics: Reefer placed near vessel heat source (engine room bulkhead, funnel uptake); to be avoided.
Hot Tap X13. Marine Salvage and Wreck Removal: Drilling into a tank under pressure without releasing contents, key oil removal tool.
Hot tub X125. Superyacht Industry, Builders and Brokers: Standard equipment on most yachts above 50 m, usually placed on sun or owner's deck.
Hot Water Suit X82. Saturation Diving and Offshore Diving Operations: Open-circuit diver suit supplied with heated water through the umbilical.
Hot Well X63. Marine Auxiliary Machinery and Pumps: Tank receiving condensed steam and returns for feed back to the boiler.
Hot Wire Fuel Flow Meter X78. Voyage Optimization and Vessel Performance Software: A thermal mass flow measurement technology used for high accuracy bunker and fuel consumption monitoring on marine engines.
Hot Work X13. Marine Salvage and Wreck Removal: Cutting or welding generating sparks, restricted around hydrocarbons during salvage.
Hot work coating X45. Marine Paints, Coatings and Antifouling: Coating that withstands subsequent welding heat without releasing toxic fumes, used in shop primers.
Hot work damage X165. Marine Coatings, Antifouling, and Hull Husbandry: Coating burn-back and substrate distortion adjacent to welding or burning operations.
Hot work fire X12. Maritime Casualties and Investigation: Fire originating from welding, cutting, or grinding without adequate controls.
Hot work permit B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Yard/onboard permit before welding/cutting.
Hot Work Permit Audit X5. Marine Surveying and Inspection: Verification that hot work permits and atmospheric tests are recorded.
Hot Work Permit Survey X43. Marine Surveying and Warranty Surveying: A safety attendance verifying that areas, atmospheres, and procedures meet conditions for cutting or welding under shipyard or shipboard rules.
Hot Work Permit System X50. Ship Recycling, Demolition and Hong Kong Convention: The integrated yard procedure for authorizing cutting and welding tasks during dismantling, audited under MEPC.197(62).
Hot Work Restriction Zone X118. Ship Recycling Yards, Beaches and Regulation: Area within a defined radius of fuel tanks and pyrotechnics where hot work is prohibited until cleared.
Hot Work Warranty X53. Marine Insurance, P&I and Hull Clauses: A warranty in some hull and builders risks policies prohibiting unauthorized hot work, breach of which suspends cover.
Hot-corrosion (turbine) B2. Marine Engineering: Vanadium-sodium attack on hot-section blades.
Hot-Rolled Coil (HRC) X1. Cargo Science, Commodities and Cargo Care: Heavy steel coil, breakbulk.
Hot-Surface Ignition X63. Marine Auxiliary Machinery and Pumps: Burner ignition system using a glow plug or hot element instead of spark electrode.
Hot-tubbing X152. Maritime Arbitration and Dispute Resolution: Concurrent evidence procedure where experts answer questions together, increasingly used in maritime arbitrations to test technical evidence.
Hotel director X24. Cruise, Passenger Ship and Ferry Operations: Senior officer in charge of all hotel operations onboard.
Hotel Flag F5. The Reference Layer: Glossary, Units, Signals and Information Sources: International Code of Signals letter H, meaning "I have a pilot on board."
Hotel Operations (Cruise) E4. Cruise, offshore energy and auxiliary/specialised fleets: Non-marine onboard functions (F&B, entertainment).
Hotel Voucher Issuance X86. Port Agency, Husbandry and Disbursement: Issuance of hotel vouchers by the agent for crew lodging.
Hotspot Controller X68. Maritime Satcom and Telecommunications: Onboard device managing crew Wi-Fi authentication, vouchers, and accounting.
Hottinger Baldwin Messtechnik X96. Hull Integrity Monitoring and Strain Gauges: Full historical name of HBM, the German strain measurement instrumentation manufacturer.
Hotwell X19. Engine Room Watchkeeping and UMS Operations: Open tank receiving condensate and supplying feed pump suction.
Houlder X105. Offshore Wind Farm Installation and Vessels: UK engineering firm designing motion-compensated gangways and access systems for offshore wind SOVs.
Houlder Aktiv Gangway X59. Offshore Wind O&M, CTVs and SOVs: Motion compensated gangway designed by Houlder, deployed on several SOVs for offshore wind work.
Hour angle B3. Nautical Science: Angular distance west of meridian.
Hour circle X16. Nautical Science, Navigation and COLREGs: Great circle through a celestial body and the celestial poles.
Hourly Tariff Rate X99. Marine Salvage Awards and SCOPIC: Rate per hour under SCOPIC Annex B for short-duration services or equipment.
Hours of rest C2. Ship operations, crewing and technical management: Mandated minimum rest hours under MLC and STCW.
Hours of Rest (MLC 2.3) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Minimum 10 hours rest in 24 hours and 77 hours rest in 7 days for seafarers.
Hours of Rest CIC (2014, 2021) X146. Port State Control Regimes, MoUs, and Inspection Systems: The Paris MoU and Tokyo MoU CICs verifying STCW and MLC hours of rest compliance.
Hours of Work X102. Seafarer Welfare and Maritime Charities: MLC Regulation 2.3 maximum of 14 hours work in any 24-hour period and 72 hours in any 7-day period.
House airway bill C3. Logistics, freight forwarding and multimodal trade: HAWB.
House Bill of Lading A5. Maritime Law, private and commercial: Issued by a freight forwarder against a Master Bill from the contracting carrier.
House flag X3. Ship Handling, Seamanship and Deck Vocabulary: Owner's distinguishing flag.
House Index X41. Cruise Ship Public Health and VSP/USPH: Vector control measure used in shore-based public health, occasionally cited in cruise vector audits during port calls.
House of Lords X114. Maritime Arbitration and Shipping Law Firms: Former apex court of England and Wales whose admiralty decisions remain authoritative until departed from by the United Kingdom Supreme Court.
House-to-house X6. Container, Intermodal and Trade Codes: Older synonym for door-to-door service.
Houseboat B5. Ship Types and Individual Vessels: Residential floating craft.
Housing of Crew (MLC 3.1) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Accommodation standard for ships built after 20 August 2013.
Houston X28. Ship Recycling and End-of-Life: Texas port hosting US ship recycling facilities including former Marine Metals operations.
Houston Bunker Cluster X72. Bunkering Hubs and Bunker Suppliers: Combined bunker market of the Port of Houston including Galena Park, Channelview, Texas City, and Bayport.
Houston Bunker Contamination 2018 X115. Marine Bunker and Cargo Surveying: Widely reported fuel quality episode in 2018 involving contaminated fuel ex-Houston affecting numerous vessels worldwide.
Houston bunker hub X149. Marine Fuels, Bunkering, and Alternative Fuels: A US Gulf bunker market serving the Houston Ship Channel, with several VLSFO and MGO suppliers.
Houston International Seafarers' Center X102. Seafarer Welfare and Maritime Charities: Multi-faith seafarers' center on the Port of Houston supported by SCI and Stella Maris.
Houston LNG Bunkering X110. LNG Bunkering Infrastructure and Vessels: LNG bunkering operations in the Houston/Galveston region served by Knutsen LNG bunker vessels including Lothar Knutsen and Aman Knutsen.
Houston Marine Training Services X121. Maritime Education, Academies and Universities: US private STCW and license-prep provider founded 1953, now part of TMC Marine.
Houston Pilots X32. Marine Pilotage and Pilot Operations: Texas state pilots' association serving the 53 nautical mile Houston Ship Channel from Galveston Bar to Houston Turning Basin.
Houston Provisioning X120. Marine Catering, Provisions and Ship Chandlers: Gulf of Mexico hub for tanker and offshore vessel provisioning.
Houston Ship Channel X32. Marine Pilotage and Pilot Operations: US compulsory pilotage waterway 53 nautical miles long served by Houston Pilots.
Houston-Galveston VTS Cable Crossing Procedure X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Local protocol coordinating subsea cable repairs with pilot operations in the Houston Ship Channel.
Houthi X127. Maritime Security, Anti-Piracy and PMSCs: Ansar Allah movement controlling much of northern Yemen, claimed over 100 attacks on shipping in the Red Sea from November 2023.
Houthi Maritime Threat E1. Maritime security, geopolitics and risk: Yemen-based actor threatening Red Sea/Bab-el-Mandeb shipping.
Hover-craft skirt material B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: PVC-coated polyester used in ACV refit.
Hover-Down X31. Helicopter Operations on Ships: SAR winching technique with helicopter in steady hover above deck or sea.
Hovercraft X24. Cruise, Passenger Ship and Ferry Operations: Air-cushion vehicle once used on cross-Channel ferry services, notably the SR.N4.
Hovercraft (Hovertravel) X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The British operator running the only commercial passenger hovercraft service in the world between Southsea and Ryde across the Solent.
Hovercraft Ferry E4. Cruise, offshore energy and auxiliary/specialised fleets: Air-cushion vehicle passenger service.
Hovermarine X132. High-Speed Craft, Hydrofoils and Ferry Operators: Southampton-based builder of the HM-2, HM-216 and HM-218 sidewall hovercraft used in Hong Kong and the Persian Gulf.
Hoverspeed X132. High-Speed Craft, Hydrofoils and Ferry Operators: UK English Channel operator from 1981 to 2005 using SeaCat catamarans and the SR.N4 Princess Anne and Princess Margaret.
Hovertravel X85. Ferries, Ro-Pax Operators and Routes: Solent hovercraft operator running Ryde to Southsea services to the Isle of Wight.
Hovgaard's experiment B1. Naval Architecture: Classical demonstration of free-surface effect.
Howard Lock X103. US Inland Waterway Towing and Barge: A lock on the Tennessee-Tombigbee Waterway in Mississippi.
Howe Robinson Container Index (HRCI) X44. Shipping Indices, FFAs and Freight Markets: Container time charter index published by Howe Robinson Partners covering principal box vessel size classes.
Howe Robinson Futures X44. Shipping Indices, FFAs and Freight Markets: Derivatives broking arm of the Howe Robinson Partners group active in dry, wet, container, and gas FFAs.
Howe Robinson Partners X71. Shipbrokers and Brokerage Firms: London-headquartered shipbroker with major offices in Singapore and Hong Kong.