Glossary

Maritime glossary, terms beginning with G (page 6)

All maritime glossary terms that begin with the letter G, drawn from every subject section. 1586 entries.

Showing 250 of 1586 terms (page 6 of 7).

Greenock X39. Pre-1900 Maritime History: Scottish Clyde port and shipbuilding town active from the late seventeenth century.
Greenock Bunker Service X72. Bunkering Hubs and Bunker Suppliers: Bunker supply at Greenock Ocean Terminal in the Firth of Clyde by Petroineos and Certas Energy.
Greenpeace Briefing on Shipbreaking X50. Ship Recycling, Demolition and Hong Kong Convention: NGO advocacy materials informing the policy debate on yard standards and Basel-HKC interaction.
Greenpeace Ship Breaking campaign X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Early NGO awareness campaigning on conditions at South Asian yards in the 2000s.
GreenPort Congress X119. Maritime Conferences, Trade Shows and Awards: Annual sustainability conference for ports launched 2006 by Mercator Media.
GreenPort Cruise and Congress X119. Maritime Conferences, Trade Shows and Awards: Combined annual European port environmental event.
Greensand X57. Ocean Energy Beyond Wind: Danish offshore CCS project led by INEOS and Wintershall Dea injecting CO2 into the depleted Nini West field in the Danish North Sea.
GreenSand CCS X140. Ammonia as Marine Fuel and Hydrogen Shipping: Danish offshore CO2 storage taking emissions from Yara Sluiskil blue ammonia.
Greensand project X34. Decarbonization, Alternative Fuels and Carbon Pricing: Danish CO2 storage project in the depleted Nini oil field led by INEOS and Wintershall.
Greensea Systems X18. Ballast Water, Biofouling and Antifouling: US provider of marine robotics and hull crawler navigation used for proactive cleaning.
Greenshields Cowie X167. Major Salvage Companies, Wreck Removals, and Equipment: Historic UK salvage and tug company active from the late nineteenth century through to consolidation in the twentieth.
GreenSteam X78. Voyage Optimization and Vessel Performance Software: A vessel performance analytics provider offering machine learning models for fuel and hull and propeller performance, acquired by DNV.
GreenSteam DBM B2. Marine Engineering: Performance monitoring system.
GreenTech Marine X119. Maritime Conferences, Trade Shows and Awards: Annual conference of the Green Marine certification program, held in Canada or the United States since 2008.
Greenup Locks and Dam X103. US Inland Waterway Towing and Barge: An Ohio River navigation structure in Kentucky.
Greenwave X78. Voyage Optimization and Vessel Performance Software: A maritime technology firm offering performance, emissions, and compliance solutions.
Greenwich Hospital X39. Pre-1900 Maritime History: Royal naval hospital founded in 1694 for seamen of the Royal Navy.
Greenwich Hour Angle (GHA) B3. Nautical Science: Hour angle measured from Greenwich.
Greenwich Maritime Centre F3. Seafaring Life, Education, Professions and Institutions: University of Greenwich research center.
Greenwich Maritime World Heritage Site F2. Maritime Culture, Heritage, Archaeology, Art and Museums: UNESCO-listed Maritime Greenwich.
Greenwich Mean Time D2. Hydrography, tides, waves, bathymetry and marine geology: Time standard at the prime meridian, formerly used for tidal predictions.
Greenwich Mean Time (GMT/UT1) B3. Nautical Science: Mean solar time at Greenwich.
Greenwich meridian X16. Nautical Science, Navigation and COLREGs: Prime meridian at 0 degrees longitude.
Greg Mortimer X97. Polar Expedition Cruise and IAATO Operations: Aurora Expeditions expedition ship delivered in 2019 with 132 PAX, the first X-Bow expedition cruise vessel built by Ulstein Verft.
Greif (DDR Wilhelm Pieck) X128. Sail Training Ships and Tall Ship Associations: German brigantine built 1951 at Warnemuende, 41 m length, formerly East German training brig Wilhelm Pieck, today a German charter and youth training vessel.
Grey Ammonia X140. Ammonia as Marine Fuel and Hydrogen Shipping: Conventional unabated SMR-based NH3, accounting for 99 percent of 2023 global output of 185 Mt.
Grey Funnel Line X114. Maritime Arbitration and Shipping Law Firms: Reference name sometimes used in maritime arbitration scholarship.
Grey ice X27. Polar Code, Ice Navigation and Polar Operations: Young ice 10 to 15 cm thick, less elastic than nilas and breaking on swell.
Grey list X7. Flag State, Port State Control and Detention Vocabulary: Middle category of flag performance under Paris MoU and Tokyo MoU.
Grey seal X10. Marine Biology, Fisheries and Oceanography: *Halichoerus grypus*, a large North Atlantic phocid.
Grey water X19. Engine Room Watchkeeping and UMS Operations: Drainage from sinks, showers, and galley, segregated from sewage on most ships.
Grey Water (Annex IV) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: Drainage from dishwasher, shower, laundry, bath, and washbasin drains; not currently a regulated discharge under MARPOL Annex IV but covered under the Polar Code.
Grey Whales Population Recovery D3. Marine environmental science, pollution and conservation: Conservation outcome under various national programs.
Grey-white ice X27. Polar Code, Ice Navigation and Polar Operations: Young ice 15 to 30 cm thick.
GRI X6. Container, Intermodal and Trade Codes: General Rate Increase, scheduled across-the-board uplift of ocean freight rates.
Grid code compliance (marine) X57. Ocean Energy Beyond Wind: Conformance of tidal, wave, and offshore solar plants with national grid connection requirements.
Grid connection agreement X42. Offshore Wind Installation and Cable Lay: Contract between offshore wind developer and transmission operator setting connection terms.
Grid Convergence Index X54. Naval Architecture Software and IACS Rules: Roache method metric for CFD spatial discretization error reported in ship hydrodynamics studies.
Grid course X16. Nautical Science, Navigation and COLREGs: Course measured from grid north on polar charts.
Grid Reinforcement Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Submarine cable installed to strengthen interconnection between regions of an existing electricity grid, often using HVAC.
Grieg Seafood ASA X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Norwegian salmon farmer headquartered in Bergen with operations in Norway and Canada and an annual harvest of about 75,000 tonnes.
Grievance Mechanism X154. Maritime Welfare, Seafarer Charities, and MLC Rights: General term covering MLC Regulations 5.1.5 and 5.2.2 complaint procedures.
Grievance procedure X21. STCW Certificates, Crewing and Seafarer Welfare: Onboard and ashore complaint mechanism required by MLC Regulation 5.1.5.
Griffon Hoverwork X132. High-Speed Craft, Hydrofoils and Ferry Operators: Southampton-based hovercraft builder formed by merger of Griffon Hovercraft and Hovercraft Manufacturing, builder of 8000TD and 12000TD craft for Hovertravel.
Grim vane wheel B1. Naval Architecture: Free-rotating downstream vane wheel for propulsive improvement.
Grimaldi Group X85. Ferries, Ro-Pax Operators and Routes: Naples-based shipping conglomerate owning Grimaldi Lines, Minoan Lines, Finnlines, Atlantic Container Line, and Malta Motorways of the Sea.
Grimaldi Lines X85. Ferries, Ro-Pax Operators and Routes: Mediterranean passenger and freight brand of the Grimaldi Group serving Italy, Spain, Greece, Tunisia, and Morocco.
Grimsby X57. Ocean Energy Beyond Wind: UK port on the Humber estuary that serves as one of the largest offshore wind operations and maintenance bases in Europe.
Grimsby Royal Dock X59. Offshore Wind O&M, CTVs and SOVs: Lincolnshire dock complex serving as the O&M base for several major UK offshore wind farms, including Hornsea and Race Bank.
Grimspol propeller X38. Propellers, Stern Gear and Shaft Lines: Trade name historically used for some Grim-vane and ducted propeller configurations.
Grinder X84. Yacht Racing, Regattas and Sailing Governance: A crew member who turns winch pedestals to power sail trim, especially aboard large racers and AC boats.
Grinder Pump X63. Marine Auxiliary Machinery and Pumps: Pump with built-in cutter for handling sewage solids in vacuum systems.
Gripe X30. Tug Operations and Harbour Towage: Tendency of a tug to swing toward the towline; controlled by gob rope and towing point geometry.
Gripper X65. ROVs, AUVs, USVs and Marine Robotics: Single degree of freedom end effector used on observation-class ROVs for sample and tool retrieval.
Grit X45. Marine Paints, Coatings and Antifouling: Generic term for angular abrasive used in surface preparation.
Grit blasting X45. Marine Paints, Coatings and Antifouling: Surface preparation using angular grit to provide an angular surface profile, preferred for epoxy coatings.
Grit recovery X45. Marine Paints, Coatings and Antifouling: Reclamation of expendable abrasive by sweeping and screening, where regulations permit reuse.
Grit-blasted steel X45. Marine Paints, Coatings and Antifouling: Steel surface prepared to ISO 8501-1 grade Sa 2.5 or Sa 3 by impingement with angular grit.
Grommet X3. Ship Handling, Seamanship and Deck Vocabulary: Ring of rope or eyelet of metal.
Grommet Strop X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Endless loop made by laying up a single strand of rope into a multi-stranded ring, used as a soft eye on mooring tails.
Grooming X165. Marine Coatings, Antifouling, and Hull Husbandry: Frequent gentle removal of biofilm before macrofouling settles, distinct from reactive cleaning of established growth.
Grootschalig X124. Dredging Industry and Reclamation Contractors: Dutch term for large-scale reclamation, applied to Maasvlakte 2.
Groove weld X58. Shipbuilding Yards and Construction: Weld deposited in a groove formed by edge preparation of the joining plates.
Grooving Corrosion X5. Marine Surveying and Inspection: Linear corrosion along weld toes; mapped during ballast tank survey.
Gross berth productivity X15. Ports, Terminals and Stevedoring: container moves per total berth hour.
Gross calorific value X19. Engine Room Watchkeeping and UMS Operations: Higher heating value of fuel, used in heat balance calculations.
Gross calorific value (GCV) B2. Marine Engineering: Higher heating value of fuel.
Gross crane productivity X15. Ports, Terminals and Stevedoring: moves per crane elapsed hour including delays.
Gross daily rate C1. Commercial shipping, chartering, economics and finance: Time charter hire before commissions.
Gross Earnings Surveys F3. Seafaring Life, Education, Professions and Institutions: ISWAN seafarer welfare surveys.
Gross freight X71. Shipbrokers and Brokerage Firms: Freight before address and brokerage commissions are deducted.
Gross head (tidal range) X57. Ocean Energy Beyond Wind: Vertical difference in water level between basin and sea that drives barrage or lagoon turbine output.
Gross mass X6. Container, Intermodal and Trade Codes: Total mass of container plus contents, the figure declared under SOLAS VGM.
Gross Mass Limit X83. ISO Container Manufacturing and Leasing: 30,480 kg for a standard 20-foot dry container and 32,500 kg for a standard 40-foot dry container.
Gross mass, container X76. Stevedoring, Lashing and Cargo Securing: Total mass of a container and its contents, mandatory under SOLAS VI/2 as the Verified Gross Mass.
Gross Net Earned Premium Income (GNEPI) X117. Marine Insurance Markets, Captives and Reinsurance: The reinsurance premium base for excess of loss treaties after acquisition costs but before reinsurance.
Gross Observed Volume (GOV) X5. Marine Surveying and Inspection: Cargo volume at observed temperature including water and sediment.
Gross Register Tonnage X39. Pre-1900 Maritime History: A volumetric measure of a merchant ship's enclosed space, codified by the Moorsom system in the UK Merchant Shipping Act of 1854.
Gross Standard Volume (GSV) X5. Marine Surveying and Inspection: Volume at 15 degrees C corrected from observed conditions.
Gross terms C1. Commercial shipping, chartering, economics and finance: Voyage charter on which owner bears loading and discharging costs.
Gross Tonnage X7. Flag State, Port State Control and Detention Vocabulary: GT, measure of overall internal volume, determinant of statutory certification thresholds.
Gross tonnage (GT) B1. Naval Architecture: Volumetric measure per ITC 1969 GT = K1*V.
Gross tonnage (inland) X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: For inland vessels, gross tonnage is not used; instead, vessels are measured by deadweight in tonnes and displacement under the European inland tonnage rules.
Gross Tonnage Capacity D4. Fisheries, aquaculture, blue economy and marine resources: Vessel size metric used in fleet capacity rules.
Gross Tonnage Heavy Lift Vessel X104. Project Cargo Forwarders and Heavy Transport: ITC tonnage measure used in port dues for heavy lift carriers.
Gross Tonnage Threshold, EU SRR X50. Ship Recycling, Demolition and Hong Kong Convention: The 500 GT and above scope criterion for EU SRR application to commercial vessels.
Gross Tonnage Threshold, HKC X50. Ship Recycling, Demolition and Hong Kong Convention: The 500 GT and above scope criterion for the Hong Kong Convention.
Gross Weight X83. ISO Container Manufacturing and Leasing: Maximum permissible total weight of a container and contents marked on the CSC plate.
Grosse Ile Quarantine Station F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Canadian immigration and shipping heritage site.
Grosses Rheinschiff X33. Inland Navigation and Barge Operations: Large Rhine vessel of CEMT Class Va.
Grosvenor curves B1. Naval Architecture: Empirical resistance correlations for fishing vessels.
Groton X91. Submarines and Submarine Cable Systems: Connecticut city hosting Naval Submarine Base New London and General Dynamics Electric Boat.
Ground (earth) check X26. Reefer Containers and Cold Chain Logistics: Pre-trip electrical safety test on reefer chassis bonding.
Ground Avoidance Pipelay X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Routing technique avoiding boulders, slopes, and free-span hotspots identified during the survey campaign.
Ground Bearing Pressure (GBP) X104. Project Cargo Forwarders and Heavy Transport: Pressure exerted by crane tracks or outriggers on the soil.
Ground bed X122. Submarine Cable Laying, Repair Vessels and Operators: Subsea sea electrode used by a PFE to inject power feed current into seawater, located several hundred meters from the cable landing station.
Ground Coil X83. ISO Container Manufacturing and Leasing: Tank container coil installed in or under the vessel for heat transfer.
Ground Detection Lamp X67. Marine Electrical Systems and Shore Power: Three-lamp indicator that shows insulation status on an unearthed three-phase marine system.
Ground Fault Relay X67. Marine Electrical Systems and Shore Power: Protection device that detects current flowing to the ship hull through insulation failure.
Ground Handling X31. Helicopter Operations on Ships: All deck activities supporting helicopter arrival, refueling, and departure.
Ground Improvement Pad X104. Project Cargo Forwarders and Heavy Transport: Engineered pad of compacted material to raise bearing capacity for a crane.
Ground Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing from container base to deck D-ring.
Ground mine X77. Naval Mine Warfare and Mine Countermeasures: A bottom-laid sea mine resting on the seabed, typically of the influence type.
Ground Rope X87. Fishing Vessels and Fisheries Management: Lower rope of a trawl mouth, fitted with appropriate ground gear for bottom type.
Ground Segment X68. Maritime Satcom and Telecommunications: Network of teleports, hubs, and operations centers supporting a satellite system.
Ground Slot X46. Container Terminal Operations: A single 20-foot or 40-foot stack footprint in the yard, identified by block, bay, and row.
Ground tackle X3. Ship Handling, Seamanship and Deck Vocabulary: Anchors, cables, and associated gear.
Ground Tackle Salvage X60. Marine Salvage and Wreck Removal: Use of beach anchors, ground anchors, and chain to provide pulling points for refloating.
Ground Tackle Survey X5. Marine Surveying and Inspection: Inspection of anchors, chain, windlass, and brake holding power.
Ground Truth Dataset X109. Maritime Autonomous Surface Ships and MASS Code: An annotated set of marine imagery or sensor logs used to train and evaluate MASS perception models.
Ground wave X16. Nautical Science, Navigation and COLREGs: Radio wave propagating along the Earth's surface.
Grounded Casualty X99. Marine Salvage Awards and SCOPIC: Vessel resting on the seabed or shore, the most common subject of professional salvage operations.
Grounded Vessel Clause X53. Marine Insurance, P&I and Hull Clauses: Provisions addressing the recovery of grounding expenses, particularly in the Institute Time Clauses Hulls.
Groundfish X10. Marine Biology, Fisheries and Oceanography: Demersal fish targeted in trawl fisheries (e.g., cod, haddock, pollock, flatfish).
Grounding X12. Maritime Casualties and Investigation: Casualty in which a vessel's hull contacts the seabed, the shore, or an underwater obstruction.
Grounding Casualty X60. Marine Salvage and Wreck Removal: Salvage incident initiated by a vessel making contact with the seabed.
Grounding Cell X100. Marine Cathodic Protection and Anodes: A buried sacrificial anode assembly used as a low-resistance earth for AC grounding while also providing CP current.
Grounding investigations X163. Marine Accident Investigation Agencies and Landmark Inquiries: Subset of casualty inquiries focused on navigation, bridge resource management, electronic chart use, and pilotage.
Grounding Line D5. Coastal processes, sea-level, cryosphere and ocean observation science: Junction where a glacier transitions to floating ice.
Grounding Survey X5. Marine Surveying and Inspection: Bottom and structural inspection after touching bottom or grounding.
Groundings X103. US Inland Waterway Towing and Barge: Incidents in which a barge or towboat touches bottom; reported under USCG casualty rules.
Grounds for Detention X66. Port State Control and Regional MOUs: Conditions in Annex 1 of Paris MOU justifying ship detention.
Groundwave (HF) B3. Nautical Science: Surface propagation path of HF/MF radio.
Group A (IMSBC) X1. Cargo Science, Commodities and Cargo Care: Cargoes that may liquefy if shipped above their TML.
Group B (IMSBC) X1. Cargo Science, Commodities and Cargo Care: Cargoes with chemical hazards (self-heating, gas emission, oxidation).
Group C (IMSBC) X1. Cargo Science, Commodities and Cargo Care: Cargoes not liable to liquefy nor possessing chemical hazards.
Group Excess Loss X53. Marine Insurance, P&I and Hull Clauses: The reinsurance layer purchased by the International Group above the Pool retention and Hydra layer.
Group Excess Loss Reinsurance X4. Marine Insurance, P&I and Claims: International Group's collective reinsurance program above the Pool retention.
Group I base oil X61. Marine Lubricants and Cylinder Oils: Solvent-refined mineral base oil with less than 90 percent saturates and more than 0.03 percent sulfur.
Group I to V Oils X126. Marine Oil Spill Response and OPRC Regimes: USCG classification of persistent oils by specific gravity for response planning under 33 CFR 155.
Group II base oil X61. Marine Lubricants and Cylinder Oils: Hydroprocessed mineral base oil with greater than 90 percent saturates and lower sulfur than Group I.
Group III base oil X61. Marine Lubricants and Cylinder Oils: Severely hydroprocessed mineral base oil with viscosity index above 120, marketed as synthetic in many jurisdictions.
Group IV base oil X61. Marine Lubricants and Cylinder Oils: Polyalphaolefin synthetic base stock.
Group of Companies Doctrine X51. Maritime Arbitration, Law and BIMCO Clauses: A controversial principle extending an arbitration agreement to non-signatory affiliates, recognized in some civilian systems and rejected in English law.
Group of Friends of Maritime Security E1. Maritime security, geopolitics and risk: UN coordination mechanism.
Group of Friends on Sanctions X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: An informal UN grouping of states critical of unilateral sanctions, occasionally invoked in maritime sanctions debates.
Group of Packing X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: An obsolete term superseded by Packing Group; PG I high danger, PG II medium, PG III low.
Group pilotage X32. Marine Pilotage and Pilot Operations: Convoy pilotage of multiple ships with a single lead pilot in restricted waters.
Group Policy X48. Maritime Cybersecurity: Microsoft Windows mechanism used to apply security configuration across shipping company workstations.
Group Policy Object (GPO) X25. Maritime Cybersecurity, OT and IT: Active Directory mechanism for enforcing security configuration.
Group Quota X87. Fishing Vessels and Fisheries Management: Allocation held collectively by a cooperative or pool of vessels.
Group Solvency X4. Marine Insurance, P&I and Claims: solvency monitoring of International Group clubs collectively.
Group starter X19. Engine Room Watchkeeping and UMS Operations: Switchboard cubicle feeding a related group of consumers such as engine room fans.
Group survival pack X27. Polar Code, Ice Navigation and Polar Operations: Polar Code item providing food, water, shelter, and signalling for survivors during the maximum expected time of rescue.
Group Transit X22. Piracy, Maritime Security and Armed Protection: Coordinated convoy of merchant ships through the Internationally Recognised Transit Corridor under naval escort.
Group V base oil X61. Marine Lubricants and Cylinder Oils: Any base stock not falling into Groups I through IV, including esters, polyalkylene glycols, and naphthenics.
Group Velocity D2. Hydrography, tides, waves, bathymetry and marine geology: Speed at which wave energy or a wave group travels.
Group velocity (waves) B1. Naval Architecture: Speed at which wave-group energy propagates.
Group-Flashing Light X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Flashing character with a group of flashes followed by an eclipse (e.g., Fl(3)15s).
Groupage C3. Logistics, freight forwarding and multimodal trade: Consolidation of LCL cargo.
Grout X41. Cruise Ship Public Health and VSP/USPH: Cementitious filler between deck and bulkhead tiles, required to remain intact under VSP Item 33.
Grout Bag X167. Major Salvage Companies, Wreck Removals, and Equipment: Cement filled bag deployed by divers to seal hull or pipeline breaches.
Grouted connection X42. Offshore Wind Installation and Cable Lay: Earlier transition piece connection method later supplemented by bolted flanged connections after slippage incidents.
GROVE GMK X169. Container Terminal Cranes, Yard Equipment, and Lashing: Manitowoc Grove all-terrain mobile crane series used in some breakbulk and project cargo terminal operations.
Growler X27. Polar Code, Ice Navigation and Polar Operations: Smaller piece of glacier ice less than 1 m above sea level, hazardous to navigation.
Growth Overfishing D4. Fisheries, aquaculture, blue economy and marine resources: Removing fish before they reach optimal size.
Groyne X15. Ports, Terminals and Stevedoring: shore-perpendicular structure trapping sediment.
GRP X77. Naval Mine Warfare and Mine Countermeasures: An abbreviation for glass reinforced plastic, the dominant hull material for modern Western minehunters.
GRP Panel X83. ISO Container Manufacturing and Leasing: Glass-reinforced plastic panel used in some reefer container liners.
GRP, Glass Reinforced Plastic F4. Recreational Boating, Yachting and Sport: Standard hull material for production yachts.
Grundfos X63. Marine Auxiliary Machinery and Pumps: Danish manufacturer of centrifugal pumps used in many marine fresh water and sanitary applications.
Grundfos CR X63. Marine Auxiliary Machinery and Pumps: Vertical multistage centrifugal pump used as hydrophore, jockey, and feed pump.
Grundfos NK X63. Marine Auxiliary Machinery and Pumps: End-suction centrifugal pump used for general service.
Grup Maritim TCB X138. Global Container Terminal Operators and Port Equipment: Spanish port operator acquired by APM Terminals in 2016 for 1.1 billion euros, expanded Maersk presence in Latin America.
Grytviken X97. Polar Expedition Cruise and IAATO Operations: Former whaling station on South Georgia and site of Ernest Shackleton's grave, a key heritage landing for South Atlantic voyages.
GS1 X120. Marine Catering, Provisions and Ship Chandlers: Brussels based standards body administering EAN and GTIN barcoding across the chandler supply chain.
GS1-128 Carton Label X41. Cruise Ship Public Health and VSP/USPH: Standardized supplier label that supports lot-level traceback during foodborne outbreak inquiries.
GSM (Greenland Sub-Glacial Melt) D5. Coastal processes, sea-level, cryosphere and ocean observation science: Subglacial discharge to fjords.
GSP X6. Container, Intermodal and Trade Codes: Generalized System of Preferences, tariff reductions for developing-country imports.
GSP Form A X6. Container, Intermodal and Trade Codes: Origin certificate used to claim GSP preference.
GST X73. Marine Hydrography, Charting and ENC: Geodatastyrelsen, the Danish Geodata Agency.
GST Conference (Global Sulphur Cap) X119. Maritime Conferences, Trade Shows and Awards: Annual fuel-compliance conference run by Petrospot since 2018.
GT X15. Ports, Terminals and Stevedoring: Gross Tonnage, vessel volume measure used for port dues.
GT (Gross Tonnage) X35. Yacht and Superyacht Industry: Universal yacht size measure under the 1969 International Convention on Tonnage Measurement of Ships.
GT/Pax Ratio X164. Cruise Industry, Brands, Ship Classes, and Terminals: An informal measure of perceived spaciousness, calculated as gross tonnage divided by lower berth count, with values above 50 generally considered premium.
GTAW X58. Shipbuilding Yards and Construction: Gas tungsten arc welding, TIG, used for stainless and aluminum joints in pipework and equipment.
GTI Twistlock X76. Stevedoring, Lashing and Cargo Securing: Twistlock product line associated with Global Twistlocks Inc.
GTL X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: Gas to liquids distillate produced by Shell Pearl in Qatar, used as a low-sulfur marine distillate blendstock.
GTN spray (glyceryl trinitrate) X36. Shipboard Medical, Telemedicine and Seafarer Health: Sublingual spray for angina, contraindicated with hypotension and PDE5 inhibitors.
GTNexus X101. Vessel Brokerage Software and Chartering Platforms: Cloud-based supply chain platform acquired by Infor in 2015 and rebranded into Infor Nexus.
GTS (Global Telecommunications System) X16. Nautical Science, Navigation and COLREGs: WMO system for exchange of meteorological data.
GTT X56. LNG/LPG Carriers and IGC Code: Gaztransport and Technigaz, French engineering company that licenses membrane LNG containment systems.
GTT (Gaztransport & Technigaz) X20. LNG Operations and Custody Transfer: French licensor of membrane CCS designs NO96 and Mark III families, royalties typically 5 percent of newbuild price.
GTT Mark III X56. LNG/LPG Carriers and IGC Code: GTT membrane LNG containment system using stainless steel primary barrier with corrugations on insulation panels.
GTT Mark III Flex Plus X134. LNG and LPG Carrier Operators and Containment Systems: Latest evolution with 555 mm insulation achieving 0.07 percent per day boil-off rate.
GTT Mark III Flex+ B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Membrane containment with stainless primary.
GTT Mark V X56. LNG/LPG Carriers and IGC Code: Latest GTT membrane system combining stainless steel primary barrier and Invar secondary barrier.
GTT NO96 X56. LNG/LPG Carriers and IGC Code: GTT membrane LNG containment system using Invar primary and secondary barriers with plywood boxes filled with perlite.
GTT NO96 GW X56. LNG/LPG Carriers and IGC Code: NO96 variant using reinforced polyurethane foam insulation boxes in place of perlite-filled plywood for improved BOR.
GTT NO96 Max X56. LNG/LPG Carriers and IGC Code: Further evolution of NO96 with optimized insulation for very low boil-off rate.
GTT NO96 Super+ X134. LNG and LPG Carrier Operators and Containment Systems: Latest NO96 evolution with reinforced glass wool achieving 0.07 percent per day boil-off rate.
GTT NO96 system B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Membrane LNG containment with Invar primary barrier.
GTT Sloshing Model Basin X96. Hull Integrity Monitoring and Strain Gauges: Sloshing test facility operated by Gaztransport and Technigaz in Marseille for membrane LNG containment studies.
GTW (Wartsila stern tube) X38. Propellers, Stern Gear and Shaft Lines: Wartsila water-lubricated stern-tube product family, formerly Cedervall.
Guadeloupe X84. Yacht Racing, Regattas and Sailing Governance: French Caribbean territory whose Pointe-a-Pitre is the finish of the Route du Rhum.
Guangxi X106. Naval Surface Combatants: People's Liberation Army Navy Type 075 amphibious assault ship, hull 32.
Guangzhou Dredging Company X175. Port Engineering, Dredging, Breakwaters, and Quays: Dredging subsidiary within the CCCC group based in Guangzhou, China.
Guangzhou Port Group X138. Global Container Terminal Operators and Port Equipment: SSE-listed operator of Nansha and Huangpu container terminals, 25.4 million TEU handled in 2023.
Guangzhou Salvage Bureau X60. Marine Salvage and Wreck Removal: Chinese Rescue and Salvage Bureau base on the South China coast.
Guangzhou Shipyard International X58. Shipbuilding Yards and Construction: GSI, CSSC subsidiary at Guangzhou building semi-submersibles, ferries, and bulkers.
Guano Trade F1. Maritime History: Nineteenth-century Pacific trade in Chincha Islands seabird fertilizer.
Guantanamo X122. Submarine Cable Laying, Repair Vessels and Operators: Caribbean cable transit zone hosting AMX-1, GTMO-PR and the SubCom-built MAYA-1 with frequent fault activity from fishing.
GuanXi X42. Offshore Wind Installation and Cable Lay: Reference Taiwanese offshore wind installation port at Taichung.
Guarantee Engineer F3. Seafaring Life, Education, Professions and Institutions: New-build manufacturer's representative.
Guarantee Fee X49. Ship Finance, Leasing and Maritime Capital Markets: Fee charged by an ECA or guarantor in respect of risk cover.
Guarantee of Performance X51. Maritime Arbitration, Law and BIMCO Clauses: A surety undertaking, often by a parent or bank, supporting performance of charterparty obligations.
Guarantee of port of refuge X7. Flag State, Port State Control and Detention Vocabulary: Financial assurance required before a flag State directs a damaged ship to a port of refuge.
Guarantee Survey X43. Marine Surveying and Warranty Surveying: A post-delivery attendance during the newbuilding guarantee period to inspect emerging defects and coordinate yard rectification.
Guaranteed freight C1. Commercial shipping, chartering, economics and finance: Freight payable on shipment, regardless of cargo arrival.
Guarantor X49. Ship Finance, Leasing and Maritime Capital Markets: Party providing a guarantee in support of a shipping loan obligor.
Guard Lock X103. US Inland Waterway Towing and Barge: An auxiliary lock structure protecting a canal from flood waters.
Guarda Nacional Republicana X80. Maritime Search and Rescue Coordination: Portuguese gendarmerie with maritime unit supporting SAR coordination.
Guardacostas X130. National Coast Guards and Cutter Fleets: Spanish-language term used by Latin American coast guards and by Spain's Servicio Maritimo de la Guardia Civil.
GUARDCON X22. Piracy, Maritime Security and Armed Protection: BIMCO 2012 standard contract for the employment of security guards on vessels.
Guarded by tug X15. Ports, Terminals and Stevedoring: tug standing by during cargo operations.
Guardia Costiera X80. Maritime Search and Rescue Coordination: Italian Coast Guard, Corpo delle Capitanerie di Porto, with MRCC Rome.
Guardia di Finanza X130. National Coast Guards and Cutter Fleets: Italian Financial Police with significant maritime branch operating Bigliani-class and V-7000 OPVs.
Guardian X107. Maritime Cybersecurity and OT Security: Nozomi Networks sensor providing OT and IoT visibility and anomaly detection.
Guardtime X139. Maritime Cybersecurity, OT Threats and Standards: Estonian firm providing KSI blockchain-based integrity verification for maritime data, deployed by Maersk in 2018.
Guayas X128. Sail Training Ships and Tall Ship Associations: Ecuadorian Navy three masted barquentine built 1976 at Astilleros Celaya Bilbao, 78 m length, 1,400 sq m sail area, second of the Celaya barque series for Latin American navies.
GUDE X124. Dredging Industry and Reclamation Contractors: Jan De Nul side-stone dumper.
Gudgeon X3. Ship Handling, Seamanship and Deck Vocabulary: Eye fitting on the sternpost for the rudder pintle.
Guernsey X85. Ferries, Ro-Pax Operators and Routes: Channel Island served by Condor Ferries from Poole, Portsmouth, Jersey, and St Malo.
Guernsey Financial Services Commission (GFSC) X117. Marine Insurance Markets, Captives and Reinsurance: Regulator of Guernsey's captive market, the largest European captive domicile.
Guernsey Insurance Company X117. Marine Insurance Markets, Captives and Reinsurance: A captive licensed in Guernsey under Category 1, 2, or 3 of the Insurance Business Law 2002.
Guernsey Ship Registry X98. Ship Registries and Flag States: Crown Dependency register operating within the British Red Ensign group.
Guest cabin X35. Yacht and Superyacht Industry: Stateroom configured for owner's guests, typically with en-suite head.
Guest Services X64. Cruise Industry Operators, Brands and Ships: Front-of-house onboard department handling passenger inquiries and billing.
Guest services desk X24. Cruise, Passenger Ship and Ferry Operations: Front-desk function on cruise ships.
Guest Wi-Fi X139. Maritime Cybersecurity, OT Threats and Standards: Crew or passenger network requiring strict segregation from OT per IEC 62443-3-2.
Guidance Control Navigation X109. Maritime Autonomous Surface Ships and MASS Code: The classical control engineering decomposition of vessel autonomy into guidance, control, and navigation functions.
Guidance for Inspector (GFI) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The OCIMF document that prescribes how each SIRE 2.0 question is to be assessed.
Guidance on Mental Health (ISWAN) X102. Seafarer Welfare and Maritime Charities: ISWAN good-practice publication on seafarer mental health for shipping companies and welfare providers.
Guide Pin X104. Project Cargo Forwarders and Heavy Transport: Tapered pin used to align a project unit with its foundation during set down.
Guide rail X19. Engine Room Watchkeeping and UMS Operations: Plate strip supporting crosshead shoe travel in two stroke engines.
Guide Shoe X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Crosshead component sliding on guide rails, inspected during crankcase surveys for wear of bronze running surface.
Guide vane (pre-swirl) X38. Propellers, Stern Gear and Shaft Lines: Stationary blade ahead of the propeller imparting counter-rotational flow to recover swirl energy.
Guide Wall X103. US Inland Waterway Towing and Barge: A wall extending upstream or downstream of a lock entrance to align approaching tows.
Guide Wire X82. Saturation Diving and Offshore Diving Operations: Tensioned wire constraining the bell during launch.
Guide-to-Passenger Ratio X97. Polar Expedition Cruise and IAATO Operations: IAATO standard requiring at least one staff member for every 20 passengers at Antarctic landing sites.
Guided Missile Cruiser (CG) E2. Naval, defence and maritime law enforcement: Air-defense cruiser with VLS.
Guidelines A1. The IMO and the international regulatory framework: Recommendatory texts adopted by Assembly or Committee resolutions.
Guidelines on Cyber Security Onboard Ships X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The full title of the BIMCO-led industry guidelines, currently in version 4.
Guildhall of the Hanse X39. Pre-1900 Maritime History: Steelyard on the Thames in London serving as the Hanseatic kontor until 1598.
Gujarat Enviro Protection and Infrastructure Ltd (GEPIL) X118. Ship Recycling Yards, Beaches and Regulation: TSDF operator at Surat handling hazardous wastes from Alang plots.
Gujarat Maritime Board X50. Ship Recycling, Demolition and Hong Kong Convention: The state authority overseeing Alang-Sosiya and other Gujarat coastal facilities, the competent authority for HKC implementation in the Alang cluster.
Gujarat Maritime Board (GMB) X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: The state authority regulating Alang and Sosiya yards on behalf of the Government of Gujarat.
Gujarat Maritime University X121. Maritime Education, Academies and Universities: GMU in Gandhinagar, founded 2017 by Gujarat Maritime Board, focused on maritime law, policy and management.
Gujarat Pollution Control Board (GPCB) X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: The state environmental regulator overseeing hazardous waste streams at Alang.
Gujarat State Pollution Control Board X50. Ship Recycling, Demolition and Hong Kong Convention: The environmental regulator for Alang-Sosiya yard discharges and emissions.