Glossary

Maritime glossary, terms beginning with M

All maritime glossary terms that begin with the letter M, drawn from every subject section. 2781 entries.

Showing 250 of 2781 terms (page 1 of 12).

M-class X77. Naval Mine Warfare and Mine Countermeasures: A Belgian Naval Component designation for its Tripartite mine countermeasures vessels prior to replacement by the rMCM program.
M/V Wakashio X53. Marine Insurance, P&I and Hull Clauses: The bulk carrier that grounded off Mauritius in July 2020, causing a significant bunker oil spill that drew attention to non-tanker pollution liability under the Bunker Convention.
M/Y X125. Superyacht Industry, Builders and Brokers: Motor Yacht prefix to a yacht name in formal correspondence.
M+R X6. Container, Intermodal and Trade Codes: Maintenance and repair of containers.
M10 X95. GMDSS Equipment and Survival Craft Communications: Marine Rescue Technologies M10 AIS man overboard device transmitting on AIS channels 87B and 88B.
M11 (Cummins) X90. Marine Engine Specific Model Enumeration: Cummins 11 liter inline six-cylinder marine diesel for commercial propulsion duty.
M2 D2. Hydrography, tides, waves, bathymetry and marine geology: Principal lunar semi-diurnal tidal constituent with period 12.42 hours.
M4 D2. Hydrography, tides, waves, bathymetry and marine geology: Higher harmonic of M2 caused by shallow water tidal distortion.
M51 X11. Naval Vessels, Warship Systems and Naval Architecture: French Navy SLBM on Triomphant class.
M51 SLBM X91. Submarines and Submarine Cable Systems: French submarine-launched ballistic missile carried by Triomphant-class SSBNs.
MA (Modified Atmosphere) X26. Reefer Containers and Cold Chain Logistics: Passive gas environment created by produce respiration inside sealed liner; no active gas injection.
MA technology X70. Reefer Containers and Cold Chain Shipping: Modified atmosphere using packaging films or initial gas flush, distinct from active controlled-atmosphere systems.
MA-series (Mitsubishi) X90. Marine Engine Specific Model Enumeration: Mitsubishi medium-speed marine diesel engine family for main and auxiliary applications.
Maag Gear X90. Marine Engine Specific Model Enumeration: Swiss manufacturer of marine reduction gearboxes used in propulsion drivetrains.
Maanshan X92. Marine Steel Suppliers and Shipbuilding Plate: Maanshan Iron and Steel, Chinese state owned integrated producer in Anhui province.
MAAP X55. Marine Simulators, Training and Maritime Academies: Maritime Academy of Asia and the Pacific in Mariveles, Bataan, Philippines, established with industry support to supply officers worldwide.
Maasvlakte 2 X124. Dredging Industry and Reclamation Contractors: Rotterdam port extension 2008-2013 reclaiming 2,000 ha at a cost of EUR 1.5 billion, executed by PUMA consortium of Boskalis and Van Oord.
Maasvlakte II LNG Bunkering X110. LNG Bunkering Infrastructure and Vessels: LNG bunkering area at the Port of Rotterdam's Maasvlakte II expansion, served via Gate Terminal and bunker vessels including Cardissa and Optimus.
MAATS X42. Offshore Wind Installation and Cable Lay: Reference logistics contractor.
MAB X63. Marine Auxiliary Machinery and Pumps: Alfa Laval manual sludge discharge purifier for small engines.
Mabanaft Marine X72. Bunkering Hubs and Bunker Suppliers: German trading group based in Hamburg, parent of Bomin and active in Houston, Singapore, and Rotterdam.
MAC Address X107. Maritime Cybersecurity and OT Security: Media Access Control address, a hardware identifier for network interfaces used in OT asset inventories.
MAC Address Filtering X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: A weak control, often defeated, used on poorly hardened bridge Ethernet switches.
MacAndrews X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The historic short sea container operator (founded 1770) absorbed into CMA CGM and now branded as CMA CGM Shortsea (the MacAndrews brand was retired in 2019).
Macao (China) PSC X66. Port State Control and Regional MOUs: Tokyo MOU member.
Macaroni Penguin X97. Polar Expedition Cruise and IAATO Operations: Crested penguin (Eudyptes chrysolophus) with bright orange head plumes, breeding on South Georgia and the South Sandwich Islands.
MACC (Marginal Abatement Cost Curve) X34. Decarbonization, Alternative Fuels and Carbon Pricing: Ranking of mitigation measures by cost per tonne CO2eq avoided.
MacGregor X3. Ship Handling, Seamanship and Deck Vocabulary: Common type of folding steel hatch cover.
MacGregor LMS X169. Container Terminal Cranes, Yard Equipment, and Lashing: Lashing System software used to verify container stowage against ship-specific lashing limits.
MacGregor Pusnes X94. Port Machinery and Quay Equipment Makers: Norwegian deck machinery range within MacGregor producing anchor handling, mooring, and turret systems.
MacGregor QRH X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Quick Release Hook product line manufactured by MacGregor for marine terminal mooring systems.
MacGregor SeaLink X76. Stevedoring, Lashing and Cargo Securing: MacGregor product line of container lashing and twistlock equipment.
MacGregor steering gear X38. Propellers, Stern Gear and Shaft Lines: Steering gear and rudder line within Cargotec, supplied to numerous workboat and merchant projects.
MacGregor Twistlocks X169. Container Terminal Cranes, Yard Equipment, and Lashing: MacGregor family of manual, semi-automatic, and fully automatic twistlocks supplied as part of complete lashing scopes.
Macheliso X42. Offshore Wind Installation and Cable Lay: Reference placeholder; omitted from active glossary.
Machinery Annual Survey X142. Classification Societies and Class Notations: Examination of main engine, auxiliaries, steering gear, switchboards and emergency systems each year.
Machinery Continuous Survey X142. Classification Societies and Class Notations: Five year survey distributed across approximately one fifth of items per year.
Machinery Damage X108. Marine Insurance and P&I Clubs: Loss to the vessel's main engines, auxiliaries, and equipment, covered under hull and machinery policies subject to deductible.
Machinery Damage Survey X5. Marine Surveying and Inspection: Investigation into machinery breakdown and required repairs.
Machinery installations (II-1/26-39) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: General requirements, steam boilers, steering gear, communication between bridge and machinery, automation, and related auxiliaries.
Machinery requirements (Polar Code) X27. Polar Code, Ice Navigation and Polar Operations: Polar Code Chapter 6; addresses cold weather machinery performance.
Machinery Space Bilge Test X5. Marine Surveying and Inspection: Functional test of bilge alarms and pumps.
Machinery Survey X8. IACS, Class Rules and Class Notations: periodical survey of propulsion, auxiliary and electrical machinery.
Macif Sante Prevoyance X84. Yacht Racing, Regattas and Sailing Governance: The IMOCA 60 with which Charlie Dalin won the 2024-2025 Vendee Globe.
Mackerel X10. Marine Biology, Fisheries and Oceanography: Pelagic scombrid fishes of the genus *Scomber* and related taxa.
Mackerel (Frozen) X120. Marine Catering, Provisions and Ship Chandlers: IMPA 551112 IQF whole fish, common protein item.
Mackerel (Scomber scombrus) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Atlantic mackerel, with the Northeast Atlantic stock subject to a long-running quota allocation dispute.
Macondo X126. Marine Oil Spill Response and OPRC Regimes: Common name for MC252 well, source of the Deepwater Horizon spill.
MACRA X15. Ports, Terminals and Stevedoring: mobile harbour crane rating per FEM/ISO.
Macroalgae X10. Marine Biology, Fisheries and Oceanography: Multicellular algae visible to the unaided eye.
Macrocystis pyrifera X10. Marine Biology, Fisheries and Oceanography: Giant kelp, foundation species of eastern Pacific kelp forests.
Macrofouling X18. Ballast Water, Biofouling and Antifouling: Visible fouling community including barnacles, mussels, tubeworms, and macroalgae.
Macroni X124. Dredging Industry and Reclamation Contractors: Reclamation term for noodle-like sand mound from rainbow discharge.
Macroplastic D3. Marine environmental science, pollution and conservation: Plastic debris larger than 5 millimeters.
MACS3 X76. Stevedoring, Lashing and Cargo Securing: Lashing and stowage planning software originally from INTERSCHALT, now part of Navis.
Madden-Julian Oscillation (MJO) D1. Physical and chemical oceanography and marine meteorology: Eastward propagating mode of tropical convection and circulation.
Made in Steel X119. Maritime Conferences, Trade Shows and Awards: Biennial Milan steel trade fair, includes shipbuilding plate suppliers.
Made up bill C3. Logistics, freight forwarding and multimodal trade: BL prepared and ready for issue.
Madeira International Shipping Register X7. Flag State, Port State Control and Detention Vocabulary: MAR, Portuguese second register based in Funchal.
Madeiran Black Scabbardfish X87. Fishing Vessels and Fisheries Management: Aphanopus carbo, a deep water demersal species harvested by Portuguese longliners.
MAdfox X109. Maritime Autonomous Surface Ships and MASS Code: The Royal Navy NavyX rapid prototype unmanned surface vessel used for autonomy and payload trials.
Madina Iron and Steel X118. Ship Recycling Yards, Beaches and Regulation: Sitakunda, Chittagong, ship recycling facility, included in NGO Shipbreaking Platform reporting.
Madrid Convention X124. Dredging Industry and Reclamation Contractors: Refers to dredging-material pollution and the OSPAR convention region.
Madrid Protocol X27. Polar Code, Ice Navigation and Polar Operations: Protocol on Environmental Protection to the Antarctic Treaty (1991, in force 1998).
Madrid Protocol Annex IV X27. Polar Code, Ice Navigation and Polar Operations: Prevention of marine pollution; supplements MARPOL for Antarctic.
Madrid Protocol Article 15 X27. Polar Code, Ice Navigation and Polar Operations: Requires emergency response action and contingency planning.
Madrid Protocol Article 7 X27. Polar Code, Ice Navigation and Polar Operations: Prohibits Antarctic mineral resource activities.
Maersk Alabama X127. Maritime Security, Anti-Piracy and PMSCs: Bermuda-flagged container ship hijacked 8 April 2009 off Somalia, retaken by US Navy SEALs 12 April 2009; Captain Phillips rescued, three pirates killed.
Maersk Broker X71. Shipbrokers and Brokerage Firms: Independent Danish partnership shipbroker founded in 1948.
Maersk Broker Newbuilding X71. Shipbrokers and Brokerage Firms: Newbuilding desk of Maersk Broker active in dry, tanker, gas, and container projects.
MAERSK Container Industry X70. Reefer Containers and Cold Chain Shipping: Subsidiary of A. P. Moller Maersk, manufacturer of Star Cool reefer container machinery and dry containers, headquartered in Denmark.
Maersk Container Industry (MCI) X26. Reefer Containers and Cold Chain Logistics: Manufacturer of Star Cool reefer units, sold to Chinese consortium in 2021; brand retained.
MAERSK Drilling X14. Offshore Oil and Gas Marine Operations: Major offshore drilling contractor, now part of Noble Corporation.
Maersk Drone Inspection Service X96. Hull Integrity Monitoring and Strain Gauges: Drone-based vessel inspection program associated with the Maersk group.
Maersk Halifax X111. Methanol, Ammonia and Alternative Marine Fuels: Methanol dual-fuel container ship in the Maersk H-class series of 16,000-plus TEU vessels.
Maersk Hartford X111. Methanol, Ammonia and Alternative Marine Fuels: Methanol dual-fuel container ship in the Maersk H-class large container series.
Maersk Helsingor X111. Methanol, Ammonia and Alternative Marine Fuels: Methanol dual-fuel container ship in the Maersk H-class large container series.
Maersk Holesovice X111. Methanol, Ammonia and Alternative Marine Fuels: Methanol dual-fuel container ship in the Maersk H-class large container series.
Maersk Honam X141. Marine Salvage Industry and Wreck Removal Contractors: 2018 container ship fire salved by SMIT to Jebel Ali after long ocean tow.
Maersk Honam (2018) X99. Marine Salvage Awards and SCOPIC: Ultra-large container vessel that suffered a major cargo fire in the Arabian Sea, salved under LOF by Smit.
Maersk Honam fire (2018) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Singapore-flag container ship that suffered a major fire in the Arabian Sea on 6 March 2018 with five fatalities, with technical investigation supported by ABS as classification society and the…
Maersk Houston X111. Methanol, Ammonia and Alternative Marine Fuels: Methanol dual-fuel container ship in the Maersk H-class large container series.
Maersk Husbandry X86. Port Agency, Husbandry and Disbursement: Husbandry services for Maersk vessels coordinated through approved providers.
Maersk Innovator X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: CJ-70 ultra-harsh-environment jackup built for Norwegian North Sea operations.
Maersk Inspirer X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Cantilever production jackup operating as the Yme MOPU offshore Norway.
Maersk Installer X42. Offshore Wind Installation and Cable Lay: Maersk Supply Service vessel name; not in service as a WTIV; included to disambiguate from Maersk Supply Service's offshore wind support fleet.
Maersk Line X6. Container, Intermodal and Trade Codes: A.P. Moller-Maersk container line, founding partner of Gemini.
Maersk Line Port Representation X86. Port Agency, Husbandry and Disbursement: Maersk's own representation at ports of call.
Maersk Line Reefer X136. Reefer Vessels and Cool Chain Operators: World's largest reefer container operator with around 380,000 reefer TEU equipment fleet and signature Maersk Star Cool integral units.
Maersk Magnum X136. Reefer Vessels and Cool Chain Operators: Maersk reefer container designed for deep frozen cargo down to minus 35 degrees Celsius, sister product to Star Cool.
Maersk Mc-Kinney Moller B5. Ship Types and Individual Vessels: First Triple-E unit, 2013.
Maersk methanol container vessels X90. Marine Engine Specific Model Enumeration: Series of large container ships ordered by A.P. Moller-Maersk powered by MAN B&W ME-LGIM two-stroke methanol dual-fuel engines.
Maersk Nellie Bly X109. Maritime Autonomous Surface Ships and MASS Code: A workboat used in a Sea Machines Robotics SM300 autonomy demonstration with Maersk Towage Services in the United States.
Maersk NotPetya X22. Piracy, Maritime Security and Armed Protection: June 2017 ransomware incident causing reported losses of around USD 300 million to A.P. Moller Maersk.
Maersk NotPetya 2017 X48. Maritime Cybersecurity: June 2017 incident in which the NotPetya wiper, dispersed initially through compromised Ukrainian tax software, propagated through A.P. Moller-Maersk's network, with publicly reported losses of…
Maersk NotPetya Incident X139. Maritime Cybersecurity, OT Threats and Standards: 27 June 2017 event costing Moller-Maersk an estimated $300 million per the Q2 2017 interim report.
Maersk NotPetya June 2017 X25. Maritime Cybersecurity, OT and IT: NotPetya wiper destroyed approximately 49,000 endpoints, 4,000 servers and 2,500 applications across Maersk; reported loss about USD 300 million.
Maersk Oil Trading X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: In-house bunker procurement arm of A.P. Moller-Maersk, one of the largest single buyers in the global market.
Maersk Pelican X112. IMO GHG Strategy, CII, EEXI and EU Maritime Regulation: LR2 product tanker that became the first commercial vessel fitted with Norsepower Flettner rotors in 2018.
Maersk Responsible Ship Recycling Standard (RSRS) X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: A.P. Moller Maersk's owner-specific standard committing to HKC alignment and exceeding it in certain areas, applied initially at upgraded Alang yards.
Maersk Salvage X167. Major Salvage Companies, Wreck Removals, and Equipment: Salvage arm of A.P. Moller Maersk, later folded into Svitzer Salvage and ultimately Ardent and Boskalis.
Maersk Spot X101. Vessel Brokerage Software and Chartering Platforms: Container booking product launched by A.P. Moller-Maersk in 2019 offering fixed rates and loading guarantees.
Maersk Star Care X136. Reefer Vessels and Cool Chain Operators: Maersk programme for controlled atmosphere reefer container service, with CA recipes for avocados, asparagus, blueberries, and stone fruit.
Maersk Star Cool X136. Reefer Vessels and Cool Chain Operators: Integrated reefer container machinery developed by Maersk Container Industry, fitted to a large share of Maersk and OEM-supplied reefer boxes worldwide.
Maersk Supply Network X120. Marine Catering, Provisions and Ship Chandlers: Internal procurement framework for AP Moller-Maersk fleet, dominated by Wrist and Garrets contracts.
Maersk Supply Service X42. Offshore Wind Installation and Cable Lay: Danish offshore vessel owner contracted on US offshore wind feeder operations.
Maersk Tangier, The (Kyokuyo Co Ltd v AP Moller-Maersk A/S) [2018] EWCA Civ 778 X143. Landmark Maritime Law Cases and Doctrines: English Court of Appeal held that frozen tuna loins in containers were separate packages for Hague-Visby Rules limitation.
Maersk Tankers X135. Chemical Tanker Operators and IBC Code Cargoes: Danish operator that exited chemical-tanker ownership but remains active via the Hafnia pool partnership and through commercial management of stainless steel parcel tonnage.
Maersk Tankers Vetting Liaison X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The owner-side vetting coordination team for the product tanker fleet of Maersk Tankers.
Maersk Towage X137. Harbour Tugs, Towage Operators and Tug Builders: Pre-Svitzer brand name for Maersk's towage activities before the 2001 rebrand.
Maersk Training F3. Seafaring Life, Education, Professions and Institutions: Group-owned global maritime training provider.
Maersk Trim Optimization Data X115. Marine Bunker and Cargo Surveying: Voyage data inputs occasionally referenced when reconstructing trim conditions during contested draft surveys.
Maersk Triple-E B5. Ship Types and Individual Vessels: 18,300 TEU container ship class.
Maersk Venturer X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Samsung-built drillship operated by Noble after the Maersk Drilling merger.
Maersk Voyager X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Samsung-built drillship operated by Noble after the Maersk Drilling merger.
Maersk, Arnold Peter Moller X39. Pre-1900 Maritime History: Danish shipowner whose Svendborg firm of 1904 grew into the modern Maersk group (founder lived 1876 to 1965).
MAESTRO X54. Naval Architecture Software and IACS Rules: MAESTRO Marine global ship structural analysis software combining FEM modeling, rule checks, and optimization.
MAESTRO ALPS X54. Naval Architecture Software and IACS Rules: Advanced Limit States buckling module within the MAESTRO suite.
MAESTRO Marine X54. Naval Architecture Software and IACS Rules: Vendor of the MAESTRO ship structural analysis platform headquartered in the United States.
Mafi X169. Container Terminal Cranes, Yard Equipment, and Lashing: Mafi Transport Systems, German maker of roll trailers from 20 to 140 tonne capacity for RoRo and project terminals, headquartered in Tubingen.
Mafi Roll Trailer X9. Cargo Securing, Lashing and Stability Vocabulary: Heavy-duty roll trailer used on ro-ro vessels for project cargo.
Mafi trailer X15. Ports, Terminals and Stevedoring: roll trailer with king-pin coupling, originally MAFI brand, used in ro-ro operations.
Mafi Trailer (Roll Trailer) X1. Cargo Science, Commodities and Cargo Care: Heavy-duty terminal trailer for RoRo and project cargo.
Magallanes Renovables X57. Ocean Energy Beyond Wind: Spanish tidal stream developer of the ATIR floating tidal turbine deployed at EMEC in Orkney.
Magazine X11. Naval Vessels, Warship Systems and Naval Architecture: Armored compartment storing ammunition and propellant.
Magazine Vessel X75. IMDG Code, Classes, Packing and Segregation: Vessel specifically designed for transport of large quantities of Class 1 explosives.
Magdalen Islands X85. Ferries, Ro-Pax Operators and Routes: Quebec archipelago in the Gulf of St Lawrence served by CTMA from Prince Edward Island.
Magdalena Oldendorff X133. Polar Research Vessels and Polar Code Regimes: Bulk carrier trapped in Antarctic ice 2002, rescued by Polarstern.
Magellan Bunker Terminal X72. Bunkering Hubs and Bunker Suppliers: Magellan Midstream terminal in Galena Park handling bunker grade product for Houston barges.
Magellan Discoverer X97. Polar Expedition Cruise and IAATO Operations: Antarctica21 fly-cruise expedition ship serving Drake-bypass voyages out of King George Island.
Magellan Explorer X97. Polar Expedition Cruise and IAATO Operations: Antarctica21 fly-cruise expedition ship delivered in 2019 with 100 PAX for Drake-bypass voyages out of King George Island.
Magellan Maritime Services X83. ISO Container Manufacturing and Leasing: Container leasing company with a focus on specialized equipment.
Magellan, Ferdinand X39. Pre-1900 Maritime History: Portuguese navigator in Spanish service whose 1519 expedition completed the first circumnavigation of the globe in September 1522.
Magellan's Circumnavigation F1. Maritime History: 1519 to 1522 voyage completed under Elcano in Victoria.
MAGIC (Magnetic and Inertial Cable Localization) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Technique for locating buried cables using a combination of magnetometer and inertial sensor data.
Magic Carpet X164. Cruise Industry, Brands, Ship Classes, and Terminals: The cantilevered orange platform on Celebrity Edge class ships that moves vertically along the starboard side to serve as a tender platform and venue.
Maglog X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Magnetic recording technology used on tracker ROVs to log magnetic anomalies indicating buried cables and ordnance.
Magnaflux inspection (shaft) X38. Propellers, Stern Gear and Shaft Lines: Magnetic particle non-destructive examination of forged shafts and propeller cones.
Magnesia Insulation X50. Ship Recycling, Demolition and Hong Kong Convention: A pre-asbestos pipe insulation type, sometimes still present aboard older tonnage and sampled during IHM development.
Magnesite X1. Cargo Science, Commodities and Cargo Care: Mineral cargo; Group C.
Magnesium Anode X100. Marine Cathodic Protection and Anodes: A sacrificial anode of Mg-Al-Zn alloy with density 1.74 g/cc, theoretical capacity 2,205 Ah/kg, and potential of about -1.55 V vs Ag/AgCl, used in fresh water and soil and prohibited in crude oil…
Magnesium Phosphide X75. IMDG Code, Classes, Packing and Segregation: UN 2011, Class 4.3 with Class 6.1 subsidiary risk.
Magnesium Powder Coated X75. IMDG Code, Classes, Packing and Segregation: UN 1418, Class 4.3 with Class 4.2 subsidiary risk depending on form.
Magnet, Pilot Ladder X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Heavy securing magnet sometimes used at the lower end of a pilot ladder to hold it flush against the ship's hull, complementing spreaders.
Magnetic anomaly X16. Nautical Science, Navigation and COLREGs: Localized departure from expected magnetic variation.
Magnetic compass B3. Nautical Science: Standard magnetic compass per ISO 449.
Magnetic Compass Mercury Inventory X50. Ship Recycling, Demolition and Hong Kong Convention: The IHM Part I or III record of mercury in legacy compass binnacles, increasingly retired in favor of fluxgate systems.
Magnetic Compass Repeater X89. ECDIS and Bridge Equipment Makers: Bridge wing repeater displaying the standard magnetic compass reading via optical or electronic transmission.
Magnetic course X16. Nautical Science, Navigation and COLREGs: Course referred to magnetic north.
Magnetic equator X16. Nautical Science, Navigation and COLREGs: Line on Earth where magnetic dip is zero.
Magnetic Hull Patch X60. Marine Salvage and Wreck Removal: Patch held to a steel hull by powerful permanent magnets, used for temporary leak repair.
Magnetic ladder securing X32. Marine Pilotage and Pilot Operations: Approved method using magnetic shoes to attach pilot ladder side ropes to the ship's hull in a combination arrangement.
Magnetic loop sweep X77. Naval Mine Warfare and Mine Countermeasures: An influence sweep system that pulses high current through a long submerged cable to generate a ship-like magnetic field.
Magnetic meridian X16. Nautical Science, Navigation and COLREGs: Line on Earth in the direction of the horizontal magnetic field.
Magnetic mine X77. Naval Mine Warfare and Mine Countermeasures: An influence mine triggered by perturbation of the local geomagnetic field by a passing ferrous hull.
Magnetic north X16. Nautical Science, Navigation and COLREGs: Direction toward magnetic north pole.
Magnetic Particle X92. Marine Steel Suppliers and Shipbuilding Plate: MT, surface and near surface nondestructive test method using magnetic flux leakage and iron particles.
Magnetic Particle Inspection (MPI) X5. Marine Surveying and Inspection: NDT method for surface and near surface crack detection.
Magnetic Pull-Off Gauge X88. Marine Surface Preparation and Coatings Application: Mechanical dry film thickness gauge that measures the force required to detach a permanent magnet from a ferrous substrate through the coating.
Magnetic signature management X77. Naval Mine Warfare and Mine Countermeasures: The discipline of measuring, modeling, and reducing a vessel's magnetic emissions to defeat magnetic mines.
Magnetic variation B3. Nautical Science: Angle between true and magnetic north at a location.
Magnetometer X42. Offshore Wind Installation and Cable Lay: Survey sensor detecting ferrous objects along proposed cable corridors during pre-lay surveys.
Magnetostrictive Sensor X96. Hull Integrity Monitoring and Strain Gauges: Sensor exploiting strain-induced changes in magnetic properties for displacement or force measurement.
Magnetron X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Cavity-resonator microwave transmitter tube historically used in marine X-band and S-band radars.
Magnolia Marine Transport X103. US Inland Waterway Towing and Barge: A Vicksburg, Mississippi inland tank barge operator carrying chemicals and refined products.
Magnor X175. Port Engineering, Dredging, Breakwaters, and Quays: Backhoe dredger in the Boskalis fleet.
Magnum X65. ROVs, AUVs, USVs and Marine Robotics: Oceaneering hydraulic work-class ROV widely used in deepwater drilling support.
Magnum Plus X136. Reefer Vessels and Cool Chain Operators: Thermo King's deep freeze reefer container model, sustaining set points down to minus 40 degrees Celsius for sashimi grade tuna and similar cargoes.
MAGNUM PLUS / Magnum 2.0 X26. Reefer Containers and Cold Chain Logistics: Thermo King deep-freeze and pharma-capable container reefer units.
MagnumPlus X70. Reefer Containers and Cold Chain Shipping: Thermo King reefer unit family designed for super-frozen cargoes, including pulldown to minus 35 degrees Celsius.
MAGNUS act / Magnuson-Stevens Act X10. Marine Biology, Fisheries and Oceanography: U.S. law governing federal marine fisheries (16 USC 1801).
Magnus effect X34. Decarbonization, Alternative Fuels and Carbon Pricing: Aerodynamic force on a spinning cylinder in cross-flow, exploited by Flettner rotors.
Magnuson-Stevens Fishery Conservation and Management Act X87. Fishing Vessels and Fisheries Management: US federal fisheries law of 1976 reauthorized in 2006 establishing the regional fishery management council system.
MAH alarm X19. Engine Room Watchkeeping and UMS Operations: Main air high temperature alarm on compressed air discharge.
Mahan, Alfred Thayer E2. Naval, defence and maritime law enforcement: Theorist on the influence of sea power on history.
Mahi-mahi X10. Marine Biology, Fisheries and Oceanography: *Coryphaena hippurus*, the common dolphinfish.
Mahkutai, The [1996] AC 650 X143. Landmark Maritime Law Cases and Doctrines: Privy Council declined to extend Himalaya clause protection to exclusive jurisdiction clauses.
Mahle Sampler X115. Marine Bunker and Cargo Surveying: Filtration and sampling equipment brand used in shipboard fuel systems, relevant to fuel system contamination investigations.
Mahsuri Adventure X127. Maritime Security, Anti-Piracy and PMSCs: Illustrative ReCAAP ISC incident-report-style vessel name.
MAIB X12. Maritime Casualties and Investigation: Marine Accident Investigation Branch of the United Kingdom, established under the Merchant Shipping Act 1988 and operating from Southampton.
MAIB (Marine Accident Investigation Branch) X163. Marine Accident Investigation Agencies and Landmark Inquiries: United Kingdom independent marine investigation body established in 1989 under the Merchant Shipping Act, based in Southampton, whose Chief Inspector reports to the Secretary of State for Transport.
MAIB Annual Report X163. Marine Accident Investigation Agencies and Landmark Inquiries: Statutory report published each year by the United Kingdom Marine Accident Investigation Branch summarising investigations, statistics, and safety recommendations.
MAIB digest X163. Marine Accident Investigation Agencies and Landmark Inquiries: Periodic publication by the UK MAIB summarising lessons from recent investigations.
MAIB Safety Bulletin X163. Marine Accident Investigation Agencies and Landmark Inquiries: Urgent communication issued by MAIB during an ongoing investigation to convey immediate safety lessons to industry.
MAIB Safety Digest X163. Marine Accident Investigation Agencies and Landmark Inquiries: Twice-yearly MAIB publication of anonymised case studies for industry training.
Maierform B1. Naval Architecture: Classic full-form hull with characteristic bow.
MAIIF X12. Maritime Casualties and Investigation: Marine Accident Investigators' International Forum, the global association of state marine investigators founded in 1992.
MAIIF (Marine Accident Investigators' International Forum) X163. Marine Accident Investigation Agencies and Landmark Inquiries: International forum of marine accident investigators that meets annually to share investigative practice and promote consistent application of the Casualty Investigation Code.
Mail Bag Delivery X86. Port Agency, Husbandry and Disbursement: Delivery of mail bags to the vessel during the port stay.
Mailbuoy X91. Submarines and Submarine Cable Systems: Submerged communications buoy released by submarines for delayed message transmission.
Main X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The principal Rhine tributary in Germany, canalized from Mainz to Bamberg and providing access to the Main-Danube Canal.
Main air compressor X19. Engine Room Watchkeeping and UMS Operations: 30 bar reciprocating compressor charging the starting air bottles.
Main bearing X19. Engine Room Watchkeeping and UMS Operations: White metal lined bearing supporting crankshaft journals in the bedplate.
Main Chamber X103. US Inland Waterway Towing and Barge: The larger of the lock chambers at a US Army Corps of Engineers navigation structure, typically 1,200 by 110 feet on the Upper Mississippi River.
Main deck block X58. Shipbuilding Yards and Construction: Upper deck section including hatch coamings and deck longitudinals.
Main deck stowage X15. Ports, Terminals and Stevedoring: containers loaded above hatch covers.
Main engine X19. Engine Room Watchkeeping and UMS Operations: Primary propulsion engine, slow speed two stroke on most ocean going ships.
Main Engine Casualty X60. Marine Salvage and Wreck Removal: Salvage incident initiated by main propulsion failure at sea.
Main Engine Driven Pump X63. Marine Auxiliary Machinery and Pumps: Pump driven directly by the main engine crankshaft or gearbox.
Main Engine Overhaul X113. Drydock and Ship Repair Yards: Drydock workscope covering low-speed two-stroke engine piston, liner, bearing, and exhaust valve refurbishment.
Main Engine Performance Test X5. Marine Surveying and Inspection: Sea or shop trial verification of engine output.
Main Engine Salvage X50. Ship Recycling, Demolition and Hong Kong Convention: The recovery of slow-speed two-stroke main engines for resale as reconditioned units, common at Alang and Aliaga.
Main engine torsiograph B2. Marine Engineering: Instrument measuring shafting torsional vibration.
Main Hoist X104. Project Cargo Forwarders and Heavy Transport: Primary hoisting circuit of a heavy crane carrying the main lift block.
Main lube oil pump X19. Engine Room Watchkeeping and UMS Operations: Engine driven or motor driven pump supplying system oil at design pressure.
Main shaft X59. Offshore Wind O&M, CTVs and SOVs: Slow speed shaft transmitting rotor torque to the gearbox or directly to the generator in direct drive machines.
Main steam stop valve X19. Engine Room Watchkeeping and UMS Operations: Boiler outlet valve isolating steam line.
Main switchboard X19. Engine Room Watchkeeping and UMS Operations: Primary distribution board receiving generator output.
Main vertical zone X24. Cruise, Passenger Ship and Ferry Operations: SOLAS II-2 fire zone bounded by A-60 divisions, normally not exceeding 48 m in length.
Main-Danube Canal X33. Inland Navigation and Barge Operations: Rhein-Main-Donau-Kanal, 171 km, completed 1992, connecting the Rhine basin to the Danube via the European Watershed.
Mainbearing Survey X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Inspection of two-stroke main bearings every 16,000 to 24,000 hours including white-metal examination and clearance measurement.
Maine Maritime Academy F3. Seafaring Life, Education, Professions and Institutions: US state maritime academy at Castine.
Maine Maritime Academy (MMA) X160. Maritime Academies, Universities, and STCW Certification: US state maritime academy at Castine Maine founded in 1941, one of six US state maritime academies.
Mainland China Maritime Courts X114. Maritime Arbitration and Shipping Law Firms: Eleven specialized maritime courts established in Beihai, Dalian, Guangzhou, Haikou, Nanjing, Ningbo, Qingdao, Shanghai, Tianjin, Wuhan, and Xiamen.
Mainline (Longline) X87. Fishing Vessels and Fisheries Management: Principal heavy line on a longline to which branch lines and floats are attached.
Mainmast X3. Ship Handling, Seamanship and Deck Vocabulary: Principal mast.
Mainsail X3. Ship Handling, Seamanship and Deck Vocabulary: Principal sail set on the mainmast.
Mainsail (Tideworks) X46. Container Terminal Operations: The vessel and yard operations module within the Tideworks software suite.
Mainsheet X3. Ship Handling, Seamanship and Deck Vocabulary: Sheet controlling the mainsail.
Maintain Class Clause X17. Chartering, Shipbroking and Freight Trading: Owner's obligation to keep the vessel in class throughout the charter.
Maintained class C2. Ship operations, crewing and technical management: Class maintained without overdue items.
Maintenance and repair X45. Marine Paints, Coatings and Antifouling: Category of coatings applied in service to extend the life of original coating systems.
Maintenance Backlog X40. Tanker Vetting, SIRE and VIQ: The volume of overdue planned-maintenance items, examined under VIQ Chapter 10 and TMSA Element 4.
Maintenance dredging X15. Ports, Terminals and Stevedoring: periodic dredging maintaining design depths.
Maintenance Drydock X113. Drydock and Ship Repair Yards: Routine drydocking aligned with the class survey cycle focused on hull treatment, anode renewal, and underwater fittings.
Maintenance Laptop X139. Maritime Cybersecurity, OT Threats and Standards: Itinerant engineering host visiting multiple vessels, a documented vector for OT compromise.
Maintenance Lock X82. Saturation Diving and Offshore Diving Operations: Small lock used to pass tools and parts into pressurized chambers.
Maintenance management system (PMS) B2. Marine Engineering: Class-approved planned maintenance software.
Maintenance Painting X88. Marine Surface Preparation and Coatings Application: Repair and overcoating of existing coating systems in service, addressed by ISO 8501-2 and SSPC-PA Guide 4.
Maintenance plan X59. Offshore Wind O&M, CTVs and SOVs: Document defining the scheduled and condition based interventions applied to each turbine and balance of plant asset.
Maintenance plan (LSA) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Required by SOLAS III/20, with weekly, monthly, and periodic inspections of life-saving appliances.
Maintenance planning system X19. Engine Room Watchkeeping and UMS Operations: PMS, software scheduling tasks by running hours, calendar, or condition.
Maintenance Stores X120. Marine Catering, Provisions and Ship Chandlers: Engine room consumables under IMPA section 73, distinct from catering.
Mainz X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The Rhine port and confluence with the Main, at km 498, hub for Hessian and Rheinhessen container, mineral oil, and agribulk flows.
Maiora X125. Superyacht Industry, Builders and Brokers: Italian production builder, part of Fipa Group.
MAIU X12. Maritime Casualties and Investigation: Marine Accident Investigation Unit of the Republic of Ireland, an independent body under the Merchant Shipping (Investigation of Marine Casualties) Act 2000.
Majestic Princess X164. Cruise Industry, Brands, Ship Classes, and Terminals: A Royal class Princess Cruises ship delivered in 2017 by Fincantieri Monfalcone for the China market and later redeployed.
Majesty of the Seas X64. Cruise Industry Operators, Brands and Ships: Former Royal Caribbean Sovereign-class ship sold in 2020.
Major (Oil Major) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A vertically integrated international oil company operating a vetting department, typically including Shell, BP, ExxonMobil, Chevron, Total, and Equinor.
Major Casualty Clause X4. Marine Insurance, P&I and Claims: clause requiring immediate notice to underwriters of major incidents.
Major Container Inspection X83. ISO Container Manufacturing and Leasing: Comprehensive inspection of a container every five years under non-ACEP CSC regime.
Major Conversion X8. IACS, Class Rules and Class Notations: structural alteration triggering re-application of current rules per SOLAS and class.
Major Hazard Vessel Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Endorsement required in many ports for pilots conducting LNG, LPG, and Class 1 cargo vessels.
Major Incident X80. Maritime Search and Rescue Coordination: SAR case involving large casualty numbers requiring multi-agency response.
Major Light X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Light of high intensity and reliability, usually a primary seacoast or landfall light.
Major non-conformity X7. Flag State, Port State Control and Detention Vocabulary: ISM Code finding indicating serious threat to personnel or ship safety or environment, requiring immediate corrective action.
Major non-conformity (BWMS) X18. Ballast Water, Biofouling and Antifouling: PSC finding indicating that BWMS is inoperative or substantially non-compliant.
MaK 12M32C X90. Marine Engine Specific Model Enumeration: MaK medium-speed marine main engine with twelve V configuration cylinders and 320 millimeter bore.
MaK 16M43C X90. Marine Engine Specific Model Enumeration: MaK medium-speed marine main engine with sixteen V configuration cylinders and 430 millimeter bore.
MaK 6M32 X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Caterpillar MaK 320 mm bore six-cylinder in-line medium-speed engine for marine main propulsion and large auxiliary duty.