Glossary

Maritime glossary, terms beginning with G (page 5)

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

Showing 250 of 1586 terms (page 5 of 7).

GPA 2166 X20. LNG Operations and Custody Transfer: Standard for obtaining natural gas samples for analysis by gas chromatography.
GPA 2172 X20. LNG Operations and Custody Transfer: Calculation of GHV, relative density, and compressibility factor for natural gas mixtures.
GPA 2261 X20. LNG Operations and Custody Transfer: GC analysis method for natural gas and similar mixtures up to C10.
GPIAAF (Gabinete de Prevencao e Investigacao de Acidentes com Aeronaves e de Acidentes Ferroviarios) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Portuguese accident investigation cabinet that, together with the Portuguese maritime investigation function, supports the marine casualty investigation role for Portugal.
GPS F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Global Positioning System, US satellite navigation system.
GPS (Fishing Vessel) X87. Fishing Vessels and Fisheries Management: Satellite positioning required for VMS and electronic logbook reporting.
GPS Augmentation X68. Maritime Satcom and Telecommunications: Use of satellite communications to deliver differential corrections to onboard GNSS receivers.
GPS Block IIIA X95. GMDSS Equipment and Survival Craft Communications: United States GPS satellites carrying the SAR/GPS payload contributing to Cospas-Sarsat MEOSAR coverage.
GPS Coordinates X75. IMDG Code, Classes, Packing and Segregation: Location data sometimes recorded for casualties involving dangerous goods, relevant under MARPOL Annex III for marine pollutants.
GPS Drogue X60. Marine Salvage and Wreck Removal: Satellite tracked drift buoy used to monitor oil slick or debris movement.
GPS Jamming X22. Piracy, Maritime Security and Armed Protection: Interference with GNSS signals, regularly reported in the eastern Mediterranean, Black Sea and Persian Gulf.
GPS L1 X109. Maritime Autonomous Surface Ships and MASS Code: The legacy single frequency GPS service still used by many maritime receivers and as a fallback for autonomy positioning.
GPS L1 C/A B3. Nautical Science: Civilian GPS signal on 1575.42 MHz.
GPS L5 X109. Maritime Autonomous Surface Ships and MASS Code: A modernized GPS frequency used by newer MASS receivers for improved performance.
GPS Marine X137. Harbour Tugs, Towage Operators and Tug Builders: London Thames harbour and barge towage operator.
GPS Receiver X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: IMO-compliant L1 receiver providing position, course, and speed over ground per IEC 61108-1.
GPS RTK D2. Hydrography, tides, waves, bathymetry and marine geology: Real-time kinematic GPS positioning at centimeter accuracy.
GPS SAR X80. Maritime Search and Rescue Coordination: SAR payload on US GPS Block IIIA MEOSAR satellites.
GPS Spoofing X22. Piracy, Maritime Security and Armed Protection: Transmission of false GNSS signals causing receivers to compute incorrect positions.
GPS Tracking Project Cargo X104. Project Cargo Forwarders and Heavy Transport: Real-time location monitoring fitted to high-value project units in transit.
GPS Week Number Rollover X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The 6 April 2019 GPS epoch rollover that affected some shipboard receivers, illustrating dependence on vendor firmware updates.
GPS-based station-keeping X10. Marine Biology, Fisheries and Oceanography: Use of GPS for dynamic positioning during oceanographic operations.
GRA Offshore X42. Offshore Wind Installation and Cable Lay: Reference Spanish marine contractor; included for completeness.
Grab X1. Cargo Science, Commodities and Cargo Care: Mechanical clamshell for loading/unloading bulk; sizes 8-50 m3.
Grab Bucket X94. Port Machinery and Quay Equipment Makers: Clamshell or orange-peel attachment fitted to a crane hook for handling bulk cargoes such as ore, coal, or scrap.
Grab Damage Survey X43. Marine Surveying and Warranty Surveying: An inspection of cargo hold tank tops and structures damaged by stevedore grab handling during bulk cargo discharge.
Grab Dredger E4. Cruise, offshore energy and auxiliary/specialised fleets: Crane-grab-based dredger.
Grab hopper dredger X175. Port Engineering, Dredging, Breakwaters, and Quays: Self-propelled hopper dredger fitted with a grab crane that loads dredged material into the onboard hopper.
GRAB Notation X8. IACS, Class Rules and Class Notations: CSR-BC notation indicating hold structure verified for specified unloading grab mass.
Grab unloader X15. Ports, Terminals and Stevedoring: shore-based crane with grab bucket for discharging bulk vessels.
GRACE / GRACE-FO D5. Coastal processes, sea-level, cryosphere and ocean observation science: Gravity Recovery and Climate Experiment missions measuring mass changes.
Grace Hopper X91. Submarines and Submarine Cable Systems: Google-sponsored trans-Atlantic submarine cable system linking the US, UK, and Spain, ready for service in 2022.
Grace Period X51. Maritime Arbitration, Law and BIMCO Clauses: A time charter provision allowing the charterer a specified number of banking days to remedy a failure to pay hire.
Graco X88. Marine Surface Preparation and Coatings Application: US manufacturer of fluid handling equipment including King and Xtreme airless spray pumps for protective coatings.
Graco King 45:1 X88. Marine Surface Preparation and Coatings Application: Airless paint pump with 45 to 1 fluid pressure ratio used for spraying medium-to-high-viscosity coatings.
Graco King 56:1 X88. Marine Surface Preparation and Coatings Application: Airless paint pump with 56 to 1 fluid pressure ratio for high-build epoxies.
Graco King 68:1 X88. Marine Surface Preparation and Coatings Application: Airless paint pump with 68 to 1 fluid pressure ratio for the most viscous protective coatings.
Graco Xtreme 70:1 X88. Marine Surface Preparation and Coatings Application: Severe-duty airless protective coatings pump with 70 to 1 fluid pressure ratio.
Grade X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: ISO 8217 product designation such as RMG 380 or DMA.
Grade 10 Chain X9. Cargo Securing, Lashing and Stability Vocabulary: Higher strength chain with minimum tensile strength 1,000 N/mm^2.
Grade 2 Chain X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Lower-strength grade of stud-link anchor chain (Grade U2) permitted by class for anchor service on smaller equipment numbers.
Grade 3 Chain X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Common grade of stud-link anchor chain (Grade U3) used on most merchant vessels, with higher strength than Grade 2.
Grade 8 Chain X9. Cargo Securing, Lashing and Stability Vocabulary: Alloy steel chain with minimum tensile strength 800 N/mm^2.
Grade A X45. Marine Paints, Coatings and Antifouling: ISO 8501-1 designation for steel covered with adherent mill scale and little or no rust.
Grade A Eggs X120. Marine Catering, Provisions and Ship Chandlers: USDA classification, IMPA 551019 hen eggs, 30-egg flat standard pack.
Grade A Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: First class endorsement used in several Commonwealth pilotage districts allowing unrestricted draft and tonnage.
Grade A Repair X83. ISO Container Manufacturing and Leasing: Repair undertaken to original equipment manufacturer specification using new components.
Grade Approval X40. Tanker Vetting, SIRE and VIQ: A charterer's confirmation that a vessel is acceptable for a specific cargo grade based on previous-cargo history.
Grade B X45. Marine Paints, Coatings and Antifouling: ISO 8501-1 designation for steel that has begun to rust and from which mill scale has begun to flake.
Grade C X45. Marine Paints, Coatings and Antifouling: ISO 8501-1 designation for steel from which mill scale has rusted away or can be scraped, with slight pitting.
Grade D X45. Marine Paints, Coatings and Antifouling: ISO 8501-1 designation for steel from which mill scale has rusted away and on which general pitting is visible.
Grade R3 / R4 / R5 Chain X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: ORQ-derived high-strength chain grades used for permanent and mobile offshore moorings with progressively higher tensile properties.
Grade Restriction X40. Tanker Vetting, SIRE and VIQ: A vessel-specific limit on cargo grades arising from class, coatings, or certificate of fitness, recorded in the Q88.
Grade Segregation X115. Marine Bunker and Cargo Surveying: Physical separation of different fuel or cargo grades in dedicated tanks and lines to avoid commingling and contamination.
Grade, Cargo X1. Cargo Science, Commodities and Cargo Care: Quality classification (e.g., HSFO 380, JET A-1).
Gradient X75. IMDG Code, Classes, Packing and Segregation: Slope at which a portable tank or vehicle may be parked, relevant to ullage and overflow under IMDG.
Gradient wind X16. Nautical Science, Navigation and COLREGs: Wind resulting from balance of pressure-gradient, Coriolis and centripetal forces.
Grading of Steel Scrap X50. Ship Recycling, Demolition and Hong Kong Convention: The classification of recovered steel into heavy melting scrap, re-rollable plate, and structural sections for downstream sale.
Grafton X103. US Inland Waterway Towing and Barge: An Illinois town at the confluence of the Illinois and Mississippi rivers.
Grain Barge X103. US Inland Waterway Towing and Barge: A covered hopper barge engaged in grain trade, typically loaded at Mid-Continent terminals for export through the Lower Mississippi River.
Grain Bucket Elevator X94. Port Machinery and Quay Equipment Makers: Vertical conveyor with attached buckets used to lift grain from ship hold to silo at elevator terminals.
Grain capacity C1. Commercial shipping, chartering, economics and finance: Cubic capacity available for grain cargo.
Grain Cargo Survey X115. Marine Bunker and Cargo Surveying: Draft survey, hold inspection, and sampling for grain cargoes carried under SOLAS Chapter VI and the International Grain Code.
Grain Clean X155. Marine Surveying Practice and Cargo Inspection: A high standard of hold cleanliness in which holds are washed, dried, and free of all residues of the previous cargo, suitable for most general cargoes.
Grain Code A2. Maritime safety legislation: SOLAS and its codes: International Code for the Safe Carriage of Grain in Bulk, mandatory under SOLAS VI/9.
Grain Code (International) X1. Cargo Science, Commodities and Cargo Care: SOLAS Chapter VI Part C; mandatory stability/stowage rules for grain.
Grain Code 1991 X158. IMO Conventions, Protocols, Codes, and Resolutions: International Code for the Safe Carriage of Grain in Bulk, adopted by MSC.23(59) and made mandatory under SOLAS VI from 1 January 1994.
Grain Code Deficiency X146. Port State Control Regimes, MoUs, and Inspection Systems: A 12xxx-related finding when ships carry grain without an approved grain loading manual or proper trimming.
Grain Cubic Capacity X1. Cargo Science, Commodities and Cargo Care: Hold volume to inside of plating; used for free-flowing grain.
Grain Heeling Moment X9. Cargo Securing, Lashing and Stability Vocabulary: Transverse moment from shifting grain, calculated per Grain Code.
Grain Hold Survey X5. Marine Surveying and Inspection: Inspection of holds for grain readiness including cleanliness and securing.
Grain Inspection X103. US Inland Waterway Towing and Barge: The USDA Federal Grain Inspection Service process for grading and weighing barge grain.
Grain Inspection Coordination X86. Port Agency, Husbandry and Disbursement: Arrangement of national grain authority inspections for loaders.
Grain Insurance X4. Marine Insurance, P&I and Claims: cargo insurance of bulk grain, often subject to trade clauses.
Grain Loading Booklet Check X5. Marine Surveying and Inspection: Verification of approved grain stability information on board.
Grain terminal X15. Ports, Terminals and Stevedoring: facility with silos, elevators, and ship loaders or unloaders.
Grain Trade F1. Maritime History: Sailing-era and modern bulk trade route, notably the Australian Grain Race of the 1920s and 1930s.
Grain Trade Route X44. Shipping Indices, FFAs and Freight Markets: Panamax voyage definitions such as ECSA to Far East that underpin BPI assessments.
Grain, Bulk X1. Cargo Science, Commodities and Cargo Care: IMSBC reference to International Grain Code.
Grand assembly X58. Shipbuilding Yards and Construction: Stage of combining blocks into megablocks before erection in the dock.
Grand Banks F1. Maritime History: Atlantic fishing grounds off Newfoundland, central to cod history.
Grand Banks SAR X80. Maritime Search and Rescue Coordination: Canadian Coast Guard SAR operations off Newfoundland.
Grand block X58. Shipbuilding Yards and Construction: Megablock formed by joining several blocks on the hardstand before dock erection.
Grand class X24. Cruise, Passenger Ship and Ferry Operations: Princess Cruises class introduced 1998 with Grand Princess.
Grand Fleet F1. Maritime History: British Royal Navy main battle force in the First World War.
Grand Maris X57. Ocean Energy Beyond Wind: Reference label sometimes used in tidal range studies of the Bay of Mont Saint Michel.
Grand Princess X64. Cruise Industry Operators, Brands and Ships: First Princess Cruises Grand-class ship delivered in 1998.
Grand Prix X84. Yacht Racing, Regattas and Sailing Governance: A term used for top-level professional offshore racing, especially the TP52 circuit.
Grand Prix Yacht F4. Recreational Boating, Yachting and Sport: Top-end custom raceboat above offshore class limits.
Grand Turk X39. Pre-1900 Maritime History: Salem privateer and East India trader built in 1781, illustrative of early American maritime commerce.
Grandeur of the Seas X64. Cruise Industry Operators, Brands and Ships: Royal Caribbean Vision-class ship delivered in 1996.
Grandfathering X142. Classification Societies and Class Notations: Practice of exempting existing ships from new rules.
Grandi Navi Veloci (GNV) X132. High-Speed Craft, Hydrofoils and Ferry Operators: Italian MSC-owned operator running Genoa, Palermo, Barcelona, Tunis and Tangier services with conventional ro-pax.
Granger Loading X104. Project Cargo Forwarders and Heavy Transport: Term sometimes used for end-to-end loading of long project units onto rail.
Granite City X92. Marine Steel Suppliers and Shipbuilding Plate: US Steel integrated works in Illinois historically producing hot rolled coil and plate.
Granite City Pool X103. US Inland Waterway Towing and Barge: The Upper Mississippi pool below Melvin Price Locks and Dam.
Granny knot X3. Ship Handling, Seamanship and Deck Vocabulary: Insecure knot resembling a reef knot but with wrong crossings.
Grant Programme (ITF Seafarers' Trust) X102. Seafarer Welfare and Maritime Charities: Annual welfare grants channeled by the ITF Seafarers' Trust to maritime ministries and welfare projects.
Granular Activated Carbon (GAC) X41. Cruise Ship Public Health and VSP/USPH: Filtration medium used to remove chlorine and organics from potable water destined for ice production.
Granular Bagged X75. IMDG Code, Classes, Packing and Segregation: Form factor for bulk solids occasionally packaged in IBCs and bags under IMDG 6.5 and 6.6.
Granular Cargo X1. Cargo Science, Commodities and Cargo Care: Particulate bulk like sand, salt, sugar.
Granular column X175. Port Engineering, Dredging, Breakwaters, and Quays: Vertical column of compacted gravel installed in soft soils to improve bearing capacity and reduce settlement beneath quays.
Grape carriage X26. Reefer Containers and Cold Chain Logistics: 0 C, 90 to 95% RH, sulfur dioxide (SO2) generator pads control Botrytis.
Grape reefer carriage X70. Reefer Containers and Cold Chain Shipping: Table grapes typically shipped at minus 0.5 to zero degrees Celsius, often with sulfur dioxide generator pads to control gray mold.
Grapefruit carriage X26. Reefer Containers and Cold Chain Logistics: Typically 13 C, 85 to 90% RH; chilling injury below 10 C.
Graphite Anode X100. Marine Cathodic Protection and Anodes: An onshore ICCP anode material with potential near +0.30 V vs Ag/AgCl, largely superseded by mixed-metal-oxide anodes at sea.
Graphite grease X61. Marine Lubricants and Cylinder Oils: Grease containing colloidal graphite for shock-loaded slow speed plain bearings.
Grapnel X3. Ship Handling, Seamanship and Deck Vocabulary: Small anchor with four or more flukes.
Grapnel Run X91. Submarines and Submarine Cable Systems: Cable ship maneuver in which a grapnel is dragged across the seabed to engage a target cable.
Grasp Lifting X81. Project Cargo, Heavy-Lift and Module Carriers: Tandem-lift technique using two cranes to handle long, heavy modules.
Grasshopper X54. Naval Architecture Software and IACS Rules: Visual programming plugin for Rhinoceros used for parametric hull form generation and optimization.
Gravel Barge X103. US Inland Waterway Towing and Barge: An open hopper barge carrying construction aggregates.
Gravel Berm X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Layer of graded gravel placed over a pipeline or cable for protection in trawled or anchoring areas.
Gravels Dredge X124. Dredging Industry and Reclamation Contractors: French aggregate dredger operating from Le Havre.
Gravimeter D2. Hydrography, tides, waves, bathymetry and marine geology: Instrument measuring gravitational acceleration, used in marine geophysics.
Gravimetric analysis X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Mass-based test method, used for sediment and ash determinations.
Gravimetric Method X100. Marine Cathodic Protection and Anodes: The mass-loss approach to corrosion-rate measurement based on weighing exposed coupons.
Graviner Mk7 X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Kidde Graviner oil mist detector system fitted to crankcases of two-stroke and large four-stroke engines for explosion prevention.
Graving dock X45. Marine Paints, Coatings and Antifouling: Land-recessed drydock used for hull coating and structural work.
Gravity base foundation X42. Offshore Wind Installation and Cable Lay: Foundation type relying on submerged self weight, optionally ballasted, used at Lillgrund and Thornton Bank.
Gravity Battery X67. Marine Electrical Systems and Shore Power: Mechanical energy storage using lifted masses, proposed for some marine and port applications.
Gravity davit X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Lifeboat-launching appliance complying with LSA Code 6.1, capable of operating at adverse list of up to 20 degrees and trim of 10 degrees.
Gravity disc X47. Marine Fuel Quality and ISO 8217: Sized ring in a conventional purifier that defines the position of the oil-water interface based on fuel density.
Gravity Discharge X75. IMDG Code, Classes, Packing and Segregation: Means of discharging contents of portable tanks, with valve design per IMDG 6.7.
Gravity feed X61. Marine Lubricants and Cylinder Oils: Lubrication method relying on oil head pressure rather than positive pumping.
Gravity Hopper X169. Container Terminal Cranes, Yard Equipment, and Lashing: Quayside funnel structure that receives bulk cargo from a grab discharge and meters it onto a conveyor or truck.
Gravity quay X175. Port Engineering, Dredging, Breakwaters, and Quays: Quay wall whose stability against earth and water pressures relies on its own dead weight, typically built from caissons or blocks.
Gravity quay wall C4. Ports, terminals and coastal/marine civil engineering: Wall relying on self-weight, often blockwork or caisson.
Gravity Refloating X60. Marine Salvage and Wreck Removal: Use of natural high tide buoyancy without external mechanical assistance to refloat a stranded vessel.
Gravity Tape X5. Marine Surveying and Inspection: Combined ullage, temperature, and water tape used in petroleum surveys.
Gravity Tie X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Survey procedure connecting absolute gravity to local stations, supporting geoid and ellipsoid-to-chart-datum modeling.
Gravity-base structure X175. Port Engineering, Dredging, Breakwaters, and Quays: Marine structure that resists loads by its own weight on the seabed, including caissons and concrete blocks.
Gravity-based structure terminal X56. LNG/LPG Carriers and IGC Code: Fixed concrete structure standing on the seabed used for offshore LNG regasification, exemplified by Adriatic LNG.
Gravity, center of X76. Stevedoring, Lashing and Cargo Securing: See CoG, container.
Gray ammonia X34. Decarbonization, Alternative Fuels and Carbon Pricing: Ammonia produced from fossil hydrogen without CCS.
Gray hydrogen X34. Decarbonization, Alternative Fuels and Carbon Pricing: Hydrogen produced from natural gas via SMR without CO2 capture.
Gray methanol X34. Decarbonization, Alternative Fuels and Carbon Pricing: Methanol from fossil natural gas without CCS.
Gray Water X41. Cruise Ship Public Health and VSP/USPH: Drainage from galleys, laundry, and showers, kept strictly separate from potable systems and managed under MARPOL Annex IV.
Gray whale X10. Marine Biology, Fisheries and Oceanography: *Eschrichtius robustus*, a baleen whale of the North Pacific.
Gray Zone Operations E1. Maritime security, geopolitics and risk: Coercive activities below the threshold of armed conflict.
Grays of Westminster X127. Maritime Security, Anti-Piracy and PMSCs: Not a PMSC; included as a frequent confusion with West-Africa-active firm Grayhawk Holdings.
GRE Pipework X69. EGCS Scrubbers, SCR and Marine Air Emissions: Glass-reinforced epoxy piping commonly specified for scrubber washwater service.
Grease cup X19. Engine Room Watchkeeping and UMS Operations: Manually operated lubrication fitting on pumps and motors.
Grease ice X27. Polar Code, Ice Navigation and Polar Operations: Later stage of frazil coagulation, forming a soupy layer giving a matte appearance to the sea.
Grease Lift X104. Project Cargo Forwarders and Heavy Transport: Lubrication of trailer axles and suspension before a long heavy haul.
Grease NLGI 2 X61. Marine Lubricants and Cylinder Oils: General purpose lithium or lithium complex grease of consistency Number 2 per the National Lubricating Grease Institute scale.
Grease Trap X41. Cruise Ship Public Health and VSP/USPH: Plumbing device intercepting fats, oils, and grease from galley drains before discharge to the sewage system.
Grease unit X59. Offshore Wind O&M, CTVs and SOVs: Automatic lubrication system in a turbine pitch or main bearing, refilled during scheduled visits.
Grease zone X45. Marine Paints, Coatings and Antifouling: Area such as ramp hinges or steering gear room where coatings must resist hydrocarbon contamination.
Grease-Filled Cable Joint X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Submarine cable joint type filled with hydrocarbon grease to prevent water ingress.
Great American Insurance Group X117. Marine Insurance Markets, Captives and Reinsurance: A US specialty insurer with a marine division writing ocean cargo and inland marine.
Great Australian Bight X10. Marine Biology, Fisheries and Oceanography: Open bay of the Southern Ocean along southern Australia.
Great Barrier Reef X10. Marine Biology, Fisheries and Oceanography: World's largest coral reef system, off the Queensland coast of Australia.
Great Barrier Reef Pilots X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Coastal pilots licensed under Australian Marine Order 54 to conduct vessels through the Inner Route and Hydrographers Passage.
Great Barrier Reef PSSA X18. Ballast Water, Biofouling and Antifouling: Earliest IMO PSSA designation in 1990, expanded in 2005.
Great Britain, SS X39. Pre-1900 Maritime History: Brunel's iron-hulled screw steamer launched at Bristol in 1843, the first ocean-going ship of her type.
Great circle B3. Nautical Science: Circle on a sphere passing through the center.
Great Circle Navigation X78. Voyage Optimization and Vessel Performance Software: A sailing technique using the shortest path on a sphere between two points, lying along the arc of a great circle of the Earth.
Great circle sailing X16. Nautical Science, Navigation and COLREGs: Method of computing the shortest track between two points.
Great Diurnal Range (Gt) D2. Hydrography, tides, waves, bathymetry and marine geology: Difference between Mean Higher High Water and Mean Lower Low Water.
Great Eastern Institute of Maritime Studies X55. Marine Simulators, Training and Maritime Academies: DGS-approved Indian MTI in Lonavla, Maharashtra, operated by The Great Eastern Shipping Company.
Great Eastern, SS X39. Pre-1900 Maritime History: Brunel and Scott Russell's iron steamship of 1858, the largest vessel built in the nineteenth century.
Great Harry X39. Pre-1900 Maritime History: Henry Grace à Dieu, English carrack launched in 1514 and the largest warship of her day.
Great Lakes X130. National Coast Guards and Cutter Fleets: USCG Ninth District covers all five Great Lakes, headquartered Cleveland, Ohio.
Great Lakes ballast regulation X18. Ballast Water, Biofouling and Antifouling: Joint US and Canadian regulation requiring saltwater flushing for vessels entering the Seaway, codified as NOBOB management.
Great Lakes Dredge & Dock X175. Port Engineering, Dredging, Breakwaters, and Quays: Largest United States dredging contractor, founded 1890 in Chicago and now headquartered in Houston, Texas.
Great Lakes EGCS Restrictions X69. EGCS Scrubbers, SCR and Marine Air Emissions: US Great Lakes prohibitions on certain scrubber discharges.
Great Lakes Insurance SE X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Munich Re subsidiary writing marine business in Europe.
Great Lakes Maritime Academy X21. STCW Certificates, Crewing and Seafarer Welfare: US maritime academy at Northwestern Michigan College training officers for the Great Lakes and oceans.
Great Lakes Maritime Academy (GLMA) X160. Maritime Academies, Universities, and STCW Certification: One of the six US state maritime academies, housed within Northwestern Michigan College at Traverse City, founded in 1969.
Great Lakes pilot X32. Marine Pilotage and Pilot Operations: Pilot registered under the Great Lakes Pilotage Authority of Canada or USCG District 9.
Great Lakes Pilotage X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Combined Canadian-US compulsory pilotage regime for foreign-flag vessels on the upper and lower Great Lakes.
Great Lakes Pilotage Act of 1960 X32. Marine Pilotage and Pilot Operations: US statute establishing the federal pilotage regime on the Great Lakes.
Great Lakes Pilotage Authority X32. Marine Pilotage and Pilot Operations: Canadian pilotage authority for the Great Lakes and St Lawrence above Montreal.
Great Lakes Submarine Power Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: HVDC and HVAC links beneath the Great Lakes, including the New York to Vermont power link studied across Lake Champlain.
Great Lakes-St. Lawrence Seaway System X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The 3,700 km navigable system from the head of Lake Superior at Duluth to the Gulf of Saint Lawrence.
Great Stirrup Cay X24. Cruise, Passenger Ship and Ferry Operations: Norwegian Cruise Line private island in the Bahamas.
Great Western, SS X39. Pre-1900 Maritime History: Brunel's wooden paddle steamer of 1837 that crossed from Bristol to New York in April 1838.
Great White Fleet X70. Reefer Containers and Cold Chain Shipping: Historic Chiquita Brands fleet of refrigerated banana vessels operating in the Latin America to North America and Europe trades.
Great Yarmouth X57. Ocean Energy Beyond Wind: UK port on the Norfolk coast supporting offshore wind, tidal, and CCS-related logistics in the southern North Sea.
Great-circle routing (polar) X27. Polar Code, Ice Navigation and Polar Operations: Shortest path between two points; significant savings on Trans-Polar routes.
Greater Bay Container Index X44. Shipping Indices, FFAs and Freight Markets: Regional container index occasionally referenced alongside SCFI and CCFI for China outbound freight analysis.
Greater Changhua 1 & 2a X105. Offshore Wind Farm Installation and Vessels: 900 MW Taiwanese offshore wind project developed by Ørsted off Changhua County with commissioning around 2024.
Greater Gabbard X42. Offshore Wind Installation and Cable Lay: UK offshore wind farm off Suffolk owned by SSE Renewables and RWE.
Greater Inducement Clause X17. Chartering, Shipbroking and Freight Trading: Time charter clause providing for additional hire if vessel performs above warranty.
Greater Tortue Ahmeyim Pipeline X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Subsea gas pipeline serving the BP-led LNG project on the Mauritania-Senegal maritime border.
Greece X7. Flag State, Port State Control and Detention Vocabulary: Major traditional registry administered by the Hellenic Register of Shipping and Hellenic Coast Guard.
Greece PSC X66. Port State Control and Regional MOUs: Paris MOU and Mediterranean MOU member State; PSC conducted by Hellenic Coast Guard.
Greek Hellenic Bureau for Marine Casualties Investigation (HBMCI) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Greek independent body (Elliniki Ypiresia Diereynisis Naytikon Atychimaton) established in 2012 to investigate marine casualties involving Greek-flag ships and incidents in Greek waters.
Greek Hellenic Coast Guard X80. Maritime Search and Rescue Coordination: HCG, national coast guard headquartered in Piraeus.
Greek Maritime Cluster F3. Seafaring Life, Education, Professions and Institutions: Piraeus-anchored shipowner community.
Greek Maritime Code X114. Maritime Arbitration and Shipping Law Firms: Codification of 1958 governing shipping disputes in Greece.
Greek Merchant Marine Academy Aspropyrgos X121. Maritime Education, Academies and Universities: AEN Aspropyrgou, one of the deck officer academies in Greece under the Ministry of Maritime Affairs.
Greek Merchant Marine Academy Hydra X121. Maritime Education, Academies and Universities: AEN Ydras, deck officer academy.
Greek Merchant Marine Academy Macedonia X121. Maritime Education, Academies and Universities: AEN Makedonias, near Thessaloniki, engine officer academy.
Greek Owners (Sanctions Exposure) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: Greek-domiciled tanker owners initially dominated Russian crude lifting under the price cap and remain the largest western-aligned trading cohort.
Greek S&P cluster X71. Shipbrokers and Brokerage Firms: Athens-based brokers Allied, Intermodal, Doric, Optima, Lion, and others active in second-hand tonnage.
Greek Salvage Sector X60. Marine Salvage and Wreck Removal: Cluster of Athens and Piraeus based salvors including Tsavliris, Ocean, Hellespont, and Five Oceans.
Greek Seamen's Federation X102. Seafarer Welfare and Maritime Charities: Common English name for the Pan-Hellenic Seamen's Federation (PNO), the umbrella Greek maritime union.
Greek Seamen's Pension Fund (NAT) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Statutory Greek seafarer welfare and pension institution.
Greek Ship Registry X98. Ship Registries and Flag States: Hellenic national registry administered by the Hellenic Coast Guard and Ministry of Shipping and Island Policy.
Greek Tonnage Tax X98. Ship Registries and Flag States: Tonnage tax codified in Greek law and protected by Article 107 of the Greek Constitution.
Greek Trireme F1. Maritime History: Three-banked oared warship of fifth-century BCE Athens.
Green Algae Bloom D3. Marine environmental science, pollution and conservation: Macroalgal bloom such as Ulva green tides.
Green Ammonia D6. Decarbonization, emissions and alternative fuels: Ammonia produced from renewable hydrogen via the Haber-Bosch process.
Green Award Foundation X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A complementary quality scheme for tankers and bulk carriers that some terminals recognize alongside SIRE and CDI.
Green Bond X49. Ship Finance, Leasing and Maritime Capital Markets: Bond whose proceeds are earmarked for eligible green projects under defined frameworks.
Green Channel X28. Ship Recycling and End-of-Life: Yard practice maintaining segregated handling and storage of hazardous materials.
Green container C3. Logistics, freight forwarding and multimodal trade: Bio-fuel insulated reefer or environmental container.
Green Corridor D6. Decarbonization, emissions and alternative fuels: Shipping route along which zero-emission options are scaled up.
Green Crab Invasion D4. Fisheries, aquaculture, blue economy and marine resources: Invasive Carcinus maenas impacting shellfisheries.
Green Cruise Ship E4. Cruise, offshore energy and auxiliary/specialised fleets: LNG/dual-fuel or hybrid cruise vessel.
Green Hydrogen D6. Decarbonization, emissions and alternative fuels: Hydrogen produced via electrolysis using renewable electricity.
Green Label (Class 2.2) X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Non-flammable non-toxic gas label with the gas cylinder symbol on green background.
Green Loan Principles X49. Ship Finance, Leasing and Maritime Capital Markets: Voluntary framework governing green loan documentation, applicable to shipping.
Green Marine Conference (GreenTech) X119. Maritime Conferences, Trade Shows and Awards: Annual North American green shipping conference launched 2008.
Green Methanol D6. Decarbonization, emissions and alternative fuels: Methanol produced from renewable feedstocks.
Green Passport A3. Marine environmental legislation: MARPOL and its annexes: Inventory of Hazardous Materials under the Hong Kong Convention.
Green Passport, Pre-IHM X50. Ship Recycling, Demolition and Hong Kong Convention: The earlier IMO concept under MEPC.A.962(23) that evolved into the Inventory of Hazardous Materials under HKC.
Green Port Compliance Support X86. Port Agency, Husbandry and Disbursement: Support to vessels meeting environmental requirements at green ports.
Green Port Initiative X124. Dredging Industry and Reclamation Contractors: PIANC working group on environmentally sustainable dredging.
Green port programme C4. Ports, terminals and coastal/marine civil engineering: Port sustainability programme such as EcoPorts.
Green Recycling X28. Ship Recycling and End-of-Life: Recycling conducted in line with HKC or EU SRR standards.
Green Sea Loads X96. Hull Integrity Monitoring and Strain Gauges: Loads from solid water boarding the deck during heavy seas, considered in HMS deck and forecastle design.
Green Ship Recycling X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: A general industry term for HKC and EU SRR aligned recycling that minimizes worker and environmental impacts.
Green Ship Recycling Yard X50. Ship Recycling, Demolition and Hong Kong Convention: A colloquial term for an HKC-compliant facility holding a recognized organization-issued Statement of Compliance.
Green Ship Recycling Yard Subsidy Scheme India X28. Ship Recycling and End-of-Life: Government incentive scheme supporting HKC compliance upgrades.
Green Square X103. US Inland Waterway Towing and Barge: The shape of a green daymark used on US inland waterways to mark the left descending side of the channel.
Green Status Light X31. Helicopter Operations on Ships: Helideck status light indicating operations may proceed.
Green turtle X10. Marine Biology, Fisheries and Oceanography: *Chelonia mydas*, a herbivorous sea turtle.
Green Ultra Long Stroke (G) X90. Marine Engine Specific Model Enumeration: MAN B&W two-stroke design family with very long stroke to bore ratios optimized for slow-running large propellers and low specific fuel consumption.
Green water X19. Engine Room Watchkeeping and UMS Operations: Solid water on deck, considered when planning weather routing from ECR aware bridge teams.
Green Water Loading X54. Naval Architecture Software and IACS Rules: Deck wetness load addressed in CSR-OT and IACS UR S33 for tanker bow structures.
Green Water Navy E2. Naval, defence and maritime law enforcement: Force operating in littorals and adjacent seas.
GreenAward X34. Decarbonization, Alternative Fuels and Carbon Pricing: Voluntary certification offering port-dues incentives for high-performing ships.
Greenhouse compatibility X45. Marine Paints, Coatings and Antifouling: Coating capability of being applied within a temporary climate-controlled enclosure on hull or tank.
Greenhouse Effect D1. Physical and chemical oceanography and marine meteorology: Atmospheric warming due to absorption and re-emission of infrared radiation.
Greenhouse Gas X75. IMDG Code, Classes, Packing and Segregation: Term not directly used in IMDG classification although some refrigerants such as UN 1078 are regulated as Class 2.2.
Greenhouse gas (ocean uptake) X10. Marine Biology, Fisheries and Oceanography: Approximately 25 percent of anthropogenic CO2 is absorbed by the ocean.
Greenhouse Gas Emissions Inventory, IHM Part III X50. Ship Recycling, Demolition and Hong Kong Convention: The reporting of CO2-equivalent refrigerants and fuels carried at delivery to recycling.
Greenhouse warming potential (GWP) X26. Reefer Containers and Cold Chain Logistics: 100-year IPCC metric comparing refrigerant global warming impact to CO2.
Greenland Connect X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: 4,800 km submarine telecommunications cable linking Nuuk, Greenland, with Reykjavik, Iceland, and Newfoundland, in service since 2009.
Greenland East Coast X97. Polar Expedition Cruise and IAATO Operations: Expedition area centered on Scoresbysund, often combined with Iceland departures.
Greenland Halibut X87. Fishing Vessels and Fisheries Management: Reinhardtius hippoglossoides, harvested by trawl and longline fleets and managed under NAFO and NEAFC.
Greenland Halibut (Reinhardtius hippoglossoides) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Deep-water flatfish targeted by Greenland, Faroese, Icelandic, Russian and Spanish longliners and trawlers.
Greenland Joint Arctic Command X80. Maritime Search and Rescue Coordination: JCG, Danish armed forces command coordinating SAR around Greenland.
Greenland West Coast X97. Polar Expedition Cruise and IAATO Operations: Expedition area encompassing Disko Bay, Ilulissat, and Inuit communities along Davis Strait.
Greenline Yachts X125. Superyacht Industry, Builders and Brokers: Slovenian hybrid production builder.
Greenlink X42. Offshore Wind Installation and Cable Lay: Ireland UK HVDC interconnector sharing seabed corridors with offshore wind cable routes.
Greenlink Interconnector X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: 504 MW HVDC submarine cable between Ireland and Wales, see GO-NSL.