Glossary

Maritime glossary, terms beginning with U (page 3)

All maritime glossary terms that begin with the letter U, drawn from every subject section. 1137 entries.

Showing 250 of 1137 terms (page 3 of 5).

Underdeck volume X162. Naval Architecture, Stability, Resistance, and Structural Design: Total enclosed volume below the freeboard deck, basis for tonnage measurement under the 1969 Tonnage Convention.
Underfeed X61. Marine Lubricants and Cylinder Oils: Cylinder oil injection rate below the optimum required for wear control, risking corrosive or adhesive damage.
Underfished Stock X87. Fishing Vessels and Fisheries Management: Stock status classification used by FAO SOFIA indicating biomass above reference points.
Underfoot X3. Ship Handling, Seamanship and Deck Vocabulary: Said of an anchor hanging directly below the hawse.
Underground Cable Junction Box X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Onshore vault connecting submarine cables to terrestrial cables, including spare-fiber management.
Underkeel Clearance X103. US Inland Waterway Towing and Barge: The vertical distance between a barge's keel and the riverbed.
Underkeel clearance criterion X175. Port Engineering, Dredging, Breakwaters, and Quays: Minimum allowable UKC for a port, set by combining squat, wave allowance, and safety margins.
Underlying contract C1. Commercial shipping, chartering, economics and finance: Original cargo or trade contract underlying a charter.
Underlying Index X161. Shipbroking, Freight Derivatives, and Baltic Indices: Specific Baltic, container, or LNG route or basket against which an FFA, swap, or option settles.
Underpass Survey X104. Project Cargo Forwarders and Heavy Transport: Measurement of underpass clearance to verify clearance for a tall project load.
Underperformance Claim X78. Voyage Optimization and Vessel Performance Software: A claim brought against an owner under a charter party alleging failure to meet warranted speed or consumption, supported by voyage performance analysis.
Underperformance Claim Adjudication X78. Voyage Optimization and Vessel Performance Software: The process by which underperformance claims are evaluated under the contractually agreed weather and good weather criteria, often using independent weather data.
Underperforming flag X7. Flag State, Port State Control and Detention Vocabulary: Flag State whose detention rate places it in the grey or black list of a regional MOU.
Underrun X3. Ship Handling, Seamanship and Deck Vocabulary: Pass beneath a line, hauling it inboard hand over hand.
Undersea power link X42. Offshore Wind Installation and Cable Lay: Generic term encompassing offshore wind export cables and HVDC interconnectors.
Undervoltage Relay X67. Marine Electrical Systems and Shore Power: Protection relay that trips a generator or load when bus voltage falls below a set point.
Underwater Acoustic Channel D5. Coastal processes, sea-level, cryosphere and ocean observation science: Propagation environment for acoustic signals.
Underwater Archaeology F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Discipline emerging mid-twentieth century with George Bass at Cape Gelidonya.
Underwater coating X45. Marine Paints, Coatings and Antifouling: Marine coating system applied to the immersed portion of the hull.
Underwater Construction Vessel (UCV) E4. Cruise, offshore energy and auxiliary/specialised fleets: Subsea construction vessel.
Underwater Cutting X167. Major Salvage Companies, Wreck Removals, and Equipment: Use of oxy arc, abrasive wire, or diamond wire to sever wreck structure underwater.
Underwater Demolition Team (Historic) E2. Naval, defence and maritime law enforcement: Precursor to modern SEAL teams.
Underwater Foil X132. High-Speed Craft, Hydrofoils and Ferry Operators: Generic term for hydrofoil lifting surfaces, surface-piercing or fully submerged.
Underwater Habitat Restoration D4. Fisheries, aquaculture, blue economy and marine resources: Active rehabilitation of degraded subtidal habitats.
Underwater Hull Cleaning Pre-Beaching X28. Ship Recycling and End-of-Life: Hull cleaning before final voyage to avoid biofouling transfers.
Underwater Hull Coating X88. Marine Surface Preparation and Coatings Application: Antifouling and anticorrosive coating system applied to the underwater portion of a vessel below the boot topping.
Underwater Hull CP X100. Marine Cathodic Protection and Anodes: The CP design for the wetted hull, sized for the dry-dock interval at current densities of about 5 to 15 mA/m^2 on coated steel or 50 to 100 mA/m^2 on damaged areas.
Underwater Hull Inspection X5. Marine Surveying and Inspection: Diver inspection of submerged hull and appendages.
Underwater hull inspection (UWILD) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: In-water survey in lieu of drydocking.
Underwater Hull Survey X43. Marine Surveying and Warranty Surveying: A diving or ROV inspection of the wetted hull, propeller, rudder, and appendages while the vessel remains afloat.
Underwater Infrastructure Cyber Risk X48. Maritime Cybersecurity: Cyber and cyber physical risk to subsea cables, pipelines, and offshore platforms.
Underwater Inspection X29. Ship Sale and Purchase, Management Contracts and Valuation: Diver survey of hull, often substitute for drydocking.
Underwater inspection in lieu of dry docking C2. Ship operations, crewing and technical management: UWILD.
Underwater Inspection in Lieu of Drydocking (UWILD) X18. Ballast Water, Biofouling and Antifouling: Class survey method that incorporates a niche area biofouling assessment.
Underwater lights X35. Yacht and Superyacht Industry: LED transom and hull lights for nighttime ambience and visibility.
Underwater Noise D3. Marine environmental science, pollution and conservation: Anthropogenic acoustic energy affecting marine life.
Underwater noise budget X57. Ocean Energy Beyond Wind: Cumulative acoustic emission budget allocated to marine construction including tidal and CCS works.
Underwater Photography Archives F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Cousteau and National Geographic collections.
Underwater Pile-cutting X124. Dredging Industry and Reclamation Contractors: Adjacent service often combined with dredging in decommissioning.
Underwater radiated noise (polar) X27. Polar Code, Ice Navigation and Polar Operations: Concern under Madrid Protocol and Arctic Council for marine mammal impacts.
Underwater radiated noise (URN) X18. Ballast Water, Biofouling and Antifouling: Acoustic emissions from shipping addressed by MEPC.1/Circ.906 (2023) revised guidelines.
Underwater research submarine (MIR) B5. Ship Types and Individual Vessels: Deep-sea research submersible.
Underwater survey X163. Marine Accident Investigation Agencies and Landmark Inquiries: Diver or ROV inspection of a wreck or grounding site commissioned by investigators to record damage and recover evidence such as the VDR capsule.
Underwater Telegraph F1. Maritime History: Mid-nineteenth century submarine cable infrastructure.
Underwater telephone X11. Naval Vessels, Warship Systems and Naval Architecture: AN/WQC-2 acoustic comms for submarines.
Underwater Welding X60. Marine Salvage and Wreck Removal: Wet or dry hyperbaric welding used for hull repairs during salvage.
Underway X9. Cargo Securing, Lashing and Stability Vocabulary: Not at anchor or moored; lashings must be maintained throughout.
Underway Bathymetry D2. Hydrography, tides, waves, bathymetry and marine geology: Bathymetric data collected during transits between survey lines.
Underway in ice X27. Polar Code, Ice Navigation and Polar Operations: Status of a ship making way through ice under own power or by escort.
Underway Inspection Coordination X86. Port Agency, Husbandry and Disbursement: Coordination of inspections that can be performed while underway.
Underway pCO2 System D5. Coastal processes, sea-level, cryosphere and ocean observation science: Continuous shipboard measurement of surface pCO2.
Underway Replenishment X22. Piracy, Maritime Security and Armed Protection: Naval activity supporting sustained counter piracy patrols.
Underway Sampling D1. Physical and chemical oceanography and marine meteorology: Continuous shipboard observation of surface seawater properties.
Underway Survey X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Survey conducted while a vessel transits at moderate speed, using hull-mounted multibeam to map seabed along passage routes.
Underwriter X4. Marine Insurance, P&I and Claims: person or entity accepting risk in exchange for premium.
Underwriter Approval X141. Marine Salvage Industry and Wreck Removal Contractors: Hull and machinery underwriter sign-off required for salvage methodology.
Underwriter Recoveries X157. Marine Loss Adjusters, GA Practice, and Casualty Firms: Sums recovered by hull or cargo underwriters from third parties via subrogated proceedings after settlement with the insured.
Underwriter, Marine X117. Marine Insurance Markets, Captives and Reinsurance: An individual or entity assessing and accepting marine risks for premium.
Underwriter's Surveyor X5. Marine Surveying and Inspection: Surveyor instructed by hull or cargo underwriters.
Underwriters' Subrogated Claim X51. Maritime Arbitration, Law and BIMCO Clauses: A claim by marine insurers in the name of the assured following payment under the policy.
Underwriters' Survey X43. Marine Surveying and Warranty Surveying: A condition or risk inspection commissioned by hull, machinery, cargo, or war risks underwriters.
Underwriting Agent, Marine F3. Seafaring Life, Education, Professions and Institutions: Lloyd's market professional.
Underwriting Commitment X49. Ship Finance, Leasing and Maritime Capital Markets: Bank undertaking to provide funds even if syndication is incomplete.
Underwriting Manager X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Common P&I structure; the club is managed by an external manager such as Thomas Miller, Tindall Riley, Charles Taylor, or Gard.
Underwriting of Demolition Voyage X50. Ship Recycling, Demolition and Hong Kong Convention: The marine insurance coverage of the final delivery voyage of an end-of-life vessel.
Underwriting Profit X4. Marine Insurance, P&I and Claims: profit on insurance operations excluding investment income.
Underwriting Surveyor X157. Marine Loss Adjusters, GA Practice, and Casualty Firms: Surveyor instructed to inspect a vessel for the purposes of accepting or maintaining hull or P&I cover.
Underwriting Year X108. Marine Insurance and P&I Clubs: The twelve month period to which a P&I policy and its calls relate, traditionally beginning at noon on 20 February.
Undisclosed Principal X51. Maritime Arbitration, Law and BIMCO Clauses: A party on whose behalf an agent contracts without disclosure, entitled to sue and be sued on the contract under English law.
Undocking X11. Naval Vessels, Warship Systems and Naval Architecture: Removal of ship from dry dock after completion of work.
Undue delay X7. Flag State, Port State Control and Detention Vocabulary: PSC liability concept under SOLAS I/19 and UNCLOS Article 226, compensable if PSC action is unwarranted.
Unearned Premium Reserve X4. Marine Insurance, P&I and Claims: reserve for the unexpired portion of in-force policies.
UnEarthed System X67. Marine Electrical Systems and Shore Power: IT marine power system without an intentional connection between the neutral and the hull.
UNECE eCMR E3. Technology, digitalization and smart shipping: Electronic consignment note (road-leg supply-chain interoperability).
UNECE Inland Transport Committee X33. Inland Navigation and Barge Operations: UN body administering ADN, CEVNI, and the European Agreement on Main Inland Waterways AGN.
UNECE Working Party on Perishable Foodstuffs X26. Reefer Containers and Cold Chain Logistics: Maintains the ATP Agreement.
UNECE WP.29 Cyber X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The automotive parallel often cited as a model for IACS UR E26's "type approval plus management system" approach.
Unencumbered Vessel X49. Ship Finance, Leasing and Maritime Capital Markets: Vessel free of mortgage and other registered security.
Unenforceable Award X51. Maritime Arbitration, Law and BIMCO Clauses: An award liable to refusal of recognition or enforcement under Article V of the New York Convention.
UNEP D3. Marine environmental science, pollution and conservation: United Nations Environment Programme.
UNEP Basel Secretariat X118. Ship Recycling Yards, Beaches and Regulation: United Nations Environment Programme unit administering the Basel Convention.
UNEP/MAP X126. Marine Oil Spill Response and OPRC Regimes: UN Environment Programme Mediterranean Action Plan, parent body of REMPEC.
UNESCO Convention on the Protection of the Underwater Cultural Heritage F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Adopted 2001, entered force 2009.
UNESCO-IOC X10. Marine Biology, Fisheries and Oceanography: Intergovernmental Oceanographic Commission of UNESCO.
Unexpected Factor X146. Port State Control Regimes, MoUs, and Inspection Systems: A factor that may give rise to additional inspection priority, such as a report from a pilot or port authority about deficiencies.
Unfair Contract Terms Act X114. Maritime Arbitration and Shipping Law Firms: United Kingdom statute of 1977 generally inapplicable to international maritime contracts under Section 26.
UNFCCC D6. Decarbonization, emissions and alternative fuels: United Nations Framework Convention on Climate Change.
Unfinished Business X124. Dredging Industry and Reclamation Contractors: Boskalis project reference for cancelled scope.
Unfit for use X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Description of fuel deemed not suitable for combustion after testing.
Unfixed Cargo X44. Shipping Indices, FFAs and Freight Markets: Physical cargo seeking tonnage at a given time, indirectly influencing spot rate assessments feeding FFA settlement.
Unfixed position X71. Shipbrokers and Brokerage Firms: Vessel still open after market close, reported by brokers the following day.
Uniclad Pipe X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Mechanically lined pipe with corrosion-resistant alloy liner used in sour-service subsea pipelines.
Unicorn (1948) X128. Sail Training Ships and Tall Ship Associations: American two masted hermaphrodite brig built 1948 in Lemvig Denmark as Lyra and rebuilt 1980s, 40 m length, used in youth and educational sail charters.
Unicorn Petroleum X72. Bunkering Hubs and Bunker Suppliers: Bunker trading subsidiary of Bunker Holding active in selected Mediterranean and Indian Ocean markets.
Unidirectional Gateway X25. Maritime Cybersecurity, OT and IT: See Data Diode.
Unidirectional Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing acting in one direction only.
Unifeeder X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The Aarhus-headquartered short sea common-feeder and shortsea container operator, owned by DP World since 2018 and the largest of its kind in Europe.
Unified Command X80. Maritime Search and Rescue Coordination: Multi-agency command structure used in mass rescue operations.
Unified Interpretations (MARPOL) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The IMO MEPC documents providing harmonized interpretations of MARPOL Annex provisions, circulated through MEPC.1/Circ. series.
Unified Procedural Requirements X54. Naval Architecture Software and IACS Rules: IACS PRs governing class society processes including software approval.
Unified Requirement X142. Classification Societies and Class Notations: IACS UR, mandatory minimum technical standard.
Unified Requirement (UR) X139. Maritime Cybersecurity, OT Threats and Standards: IACS instrument binding on member societies; UR E26 and UR E27 are the cyber URs.
Unified Requirements X54. Naval Architecture Software and IACS Rules: IACS URs published as common technical requirements adopted by all IACS members.
Uniflow scavenging B2. Marine Engineering: Scavenge arrangement with intake ports and exhaust valve.
Uniform Deck Load X104. Project Cargo Forwarders and Heavy Transport: Specified maximum uniform load per square meter on a vessel or trailer deck.
Uniform Flag F5. The Reference Layer: Glossary, Units, Signals and Information Sources: International Code of Signals letter U, meaning "You are running into danger."
Uniform Gauging Pattern X5. Marine Surveying and Inspection: Class accepted gauging pattern on plating and stiffeners.
Uniform Load X9. Cargo Securing, Lashing and Stability Vocabulary: Evenly distributed load.
Unilateral Option Clause X51. Maritime Arbitration, Law and BIMCO Clauses: A dispute resolution clause giving only one party the right to choose between arbitration and litigation, of contested enforceability.
Unilever Food Solutions Marine X120. Marine Catering, Provisions and Ship Chandlers: Industrial bouillon and condiment supplier feeding chandler catalogs.
Unilever Simulator X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment: Bridge simulator at Singapore Maritime Academy.
Uninsured Losses X157. Marine Loss Adjusters, GA Practice, and Casualty Firms: Losses or expenses borne by an insured outside policy cover, including deductibles and policy exclusions.
Uninsured Perils X108. Marine Insurance and P&I Clubs: Risks not covered by the policy, typically including war, sanctions, and certain specialty exposures absent endorsement.
Uninterruptible Power Supply X68. Maritime Satcom and Telecommunications: Battery-backed power source used to keep critical satcom equipment online through power transitions.
Unioil Marine X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: Bunker Holding subsidiary headquartered in the Philippines.
Union Castle Line F1. Maritime History: South African mail and passenger line, founded 1900.
Union Inspector X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Generic name for ITF and national-affiliate inspectors empowered to board ships.
Union Jack X39. Pre-1900 Maritime History: Flag of the United Kingdom flown as the jack of British warships from 1606 and revised in 1801.
Union representative X21. STCW Certificates, Crewing and Seafarer Welfare: ITF inspector or national union official assisting seafarers in disputes.
Unique Group X167. Major Salvage Companies, Wreck Removals, and Equipment: Sharjah headquartered subsea group manufacturing lift bags and providing buoyancy products for salvage.
Unique Hire Statement X51. Maritime Arbitration, Law and BIMCO Clauses: A consolidated statement reconciling hire, off-hire, bunkers, and CVE deductions over the charter period.
Unique Vessel Identifier (UVI) X87. Fishing Vessels and Fisheries Management: Permanent identifier such as the IMO Ship Identification Number used in the FAO Global Record.
UNIS X133. Polar Research Vessels and Polar Code Regimes: University Centre in Svalbard, Norwegian university campus in Longyearbyen.
Unit Certification X69. EGCS Scrubbers, SCR and Marine Air Emissions: Approval pathway under Scheme A based on factory-tested EGCS units.
Unit Cost Tracking (Provisioning) X120. Marine Catering, Provisions and Ship Chandlers: PMS or catering software metric tracking cost per portion against menu cycle.
Unit insulation value X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Insulation rating used in SOLAS II-2 fire-test classification.
Unit load C1. Commercial shipping, chartering, economics and finance: Standardised handling unit such as a container or pallet.
Unit Load Device X169. Container Terminal Cranes, Yard Equipment, and Lashing: Term more common in air cargo than marine, occasionally used for palletized container freight station outputs.
Unit Stock D4. Fisheries, aquaculture, blue economy and marine resources: Population unit managed as a single biological entity.
Unit-Load Container X83. ISO Container Manufacturing and Leasing: Specialty container designed to carry a single unit-load such as a power transformer.
Unitarian Seafarers' Mission X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Smaller chaplaincy tradition occasionally cooperating with ICMA.
Unite the Union X102. Seafarer Welfare and Maritime Charities: UK trade union representing some maritime grades alongside Nautilus and RMT.
Unitech Zonda X42. Offshore Wind Installation and Cable Lay: Reference Norwegian SOV.
United Arab Emirates Academy of Maritime Studies X121. Maritime Education, Academies and Universities: AMS Dubai, STCW provider.
United Arab Shipping bunker offtake X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: Legacy term; UASC was absorbed into Hapag-Lloyd in 2017 and its bunker procurement consolidated under Hapag-Lloyd Hamburg.
United Filipino Seafarers X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Maritime workers' association in the Philippines representing certain crew on ITF agreements.
United Fruit Company F1. Maritime History: Early twentieth century operator of the Great White Fleet of reefer ships.
United Heavy Lift X81. Project Cargo, Heavy-Lift and Module Carriers: Full corporate name of UHL.
United Kingdom Hydrographic Office (UKHO) F5. The Reference Layer: Glossary, Units, Signals and Information Sources: National hydrographic office, publisher of Admiralty Charts.
United Kingdom Merchant Shipping (Accident Reporting and Investigation) Regulations X163. Marine Accident Investigation Agencies and Landmark Inquiries: Statutory instrument implementing the Casualty Investigation Code in the United Kingdom and setting out the powers of MAIB inspectors.
United Kingdom Ship Register X7. Flag State, Port State Control and Detention Vocabulary: UKSR, administered by the Maritime and Coastguard Agency in Cardiff.
United Nations Convention on Contracts for the International Carriage of Goods Wholly or Partly by Sea X114. Maritime Arbitration and Shipping Law Firms: Rotterdam Rules of 2008, ratified by 5 states as of late 2025.
United Nations Convention on the Carriage of Goods by Sea X114. Maritime Arbitration and Shipping Law Firms: Hamburg Rules of 1978 adopted by 35 states parties.
United Nations Convention on the Law of the Sea (UNCLOS) 1982 E1. Maritime security, geopolitics and risk: Constitutional treaty for the oceans.
United Nations Environment Programme UNEP X28. Ship Recycling and End-of-Life: Secretariat for the Basel Convention.
United Nations Fish Stocks Agreement (UNFSA, 1995) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Implementing agreement under UNCLOS for straddling and highly migratory fish stocks.
United Nations High Seas Treaty (BBNJ) D3. Marine environmental science, pollution and conservation: 2023 agreement on marine biodiversity beyond national jurisdiction.
United Nations Principles for Responsible Investment X49. Ship Finance, Leasing and Maritime Capital Markets: Framework signed by asset managers including those allocating to shipping.
United Nations System A1. The IMO and the international regulatory framework: IMO is one of 15 UN specialized agencies, reporting to ECOSOC on technical matters.
United Salvage X60. Marine Salvage and Wreck Removal: Australian salvage operator with regional Asia Pacific operations.
United Seamen's Service (USS) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: US welfare body operating clubs for US-flag seafarers in foreign ports, founded 1942.
United Shipbuilding Corporation X58. Shipbuilding Yards and Construction: USC, Russian state shipbuilding group with multiple subsidiaries.
United States (Hales Trophy) X132. High-Speed Craft, Hydrofoils and Ferry Operators: SS United States held the trophy from 1952 until 1990 when SeaCat Tasmania broke it, regained briefly by Cat-Link in 1998.
United States (sail training policy) X128. Sail Training Ships and Tall Ship Associations: USCGC Eagle, Pride of Baltimore II, US Brig Niagara, Lady Washington, Picton Castle (Canadian flag) and the Tall Ships America fleet collectively make up the principal North American sail training…
United States Coast Guard X75. IMDG Code, Classes, Packing and Segregation: USCG, enforces SOLAS and IMDG in US ports through 33 CFR and 46 CFR.
United States Coast Guard (USCG) E2. Naval, defence and maritime law enforcement: Service combining law enforcement, SAR, port security.
United States Coast Guard Academy F3. Seafaring Life, Education, Professions and Institutions: New London officer training establishment.
United States Coast Guard Marine Board of Investigation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Highest level of USCG investigation convened under 46 CFR Part 4 for major casualties such as El Faro, Marine Electric, Edmund Fitzgerald, and Bow Mariner.
United States Coast Guard National Maritime Center (NMC) X160. Maritime Academies, Universities, and STCW Certification: USCG center in West Virginia issuing Merchant Mariner Credentials and STCW endorsements for US seafarers.
United States Coast Guard Office of Investigations and Casualty Analysis (CG-INV) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Headquarters office of the USCG that oversees the conduct of marine casualty investigations across Coast Guard districts.
United States Coast Guard polar fleet X27. Polar Code, Ice Navigation and Polar Operations: Operator of USCGC Polar Star, Polar Sea, and Healy.
United States Coast Pilot F5. The Reference Layer: Glossary, Units, Signals and Information Sources: NOAA narrative supplement to nautical charts.
United States MARAD X109. Maritime Autonomous Surface Ships and MASS Code: The Maritime Administration of the United States Department of Transportation, an agency engaged in MASS policy and demonstration.
United States Merchant Marine Academy F3. Seafaring Life, Education, Professions and Institutions: King's Point federal academy.
United States Merchant Marine Academy (USMMA) X160. Maritime Academies, Universities, and STCW Certification: US federal service academy at Kings Point New York founded in 1943 awarding US Coast Guard licenses and Navy commissions to graduates.
United States Merchant Marine Academy Simulator (Kings Point) X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment: 360-degree full-mission bridge and integrated tactical trainer.
United States Naval Institute Annual Meeting X119. Maritime Conferences, Trade Shows and Awards: Annual Maryland-based USNI event.
United States Navy (USN) E2. Naval, defence and maritime law enforcement: US maritime service.
United States PSC X66. Port State Control and Regional MOUs: Conducted by the US Coast Guard, not a member of Paris MOU or Tokyo MOU but cooperates closely.
United States Sailing Association F4. Recreational Boating, Yachting and Sport: US national sailing authority.
United States v Reliable Transfer Co, 421 US 397 (1975) X143. Landmark Maritime Law Cases and Doctrines: US Supreme Court abolished the equal division rule for collision damages, adopting proportional fault.
United Steel Allied Industries X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: A Chattogram based industrial name in the recycling-fed steel sector.
United Yacht Sales X125. Superyacht Industry, Builders and Brokers: US brokerage network.
Unitisation C3. Logistics, freight forwarding and multimodal trade: Combining cargo into standard load units.
Unitization X1. Cargo Science, Commodities and Cargo Care: Bundling small goods into a single handling unit.
Unitor X149. Marine Fuels, Bunkering, and Alternative Fuels: A brand of marine chemicals (Wilhelmsen) including bunker additives and fuel treatments.
Unitor Marine Products X86. Port Agency, Husbandry and Disbursement: Wilhelmsen Ships Service brand of marine chemicals, gases, and equipment.
Unitranche X49. Ship Finance, Leasing and Maritime Capital Markets: Single loan tranche combining senior and junior characteristics, used selectively in shipping.
Unitrol X63. Marine Auxiliary Machinery and Pumps: GEA Westfalia microprocessor control for centrifugal separators.
Unity FPSO X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: SBM Offshore FPSO Liza Unity operating on the Liza Phase 2 development offshore Guyana.
Unity Line X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The Polish RoPax operator (part of Polsteam) serving the Swinoujscie-Ystad and Swinoujscie-Trelleborg routes.
Univan Ship Management X29. Ship Sale and Purchase, Management Contracts and Valuation: Hong Kong manager, merged into Anglo-Eastern in 2015.
Universal bulk carrier B5. Ship Types and Individual Vessels: Generic dry-bulk carrier without geared specification.
Universal Bunker Standard X115. Marine Bunker and Cargo Surveying: Informal term sometimes used to refer to ISO 8217 as the de facto global specification for marine fuels.
Universal coupling B2. Marine Engineering: Flexible coupling on shafting.
Universal Customer Edge X68. Maritime Satcom and Telecommunications: Generic term for a multi-function gateway combining routing, firewall, and link management.
Universal Decimal Classification, Maritime Section F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Library classification for maritime literature.
Universal Fairlead X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Multi-roller fairlead, see Fairlead Universal.
Universal Foundation X123. Offshore Wind Installation Vessels and Operators: Danish suction bucket foundation supplier acquired by Fred. Olsen United, supplied foundations to Borkum Riffgrund 1 and 2.
Universal hydraulic pull-up tool X38. Propellers, Stern Gear and Shaft Lines: Jacking tool used to fit and remove keyless propellers from their cones.
Universal Joint (Pipeline) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Mechanical connector accommodating angular misalignment in subsea pipeline tie-ins.
Universal Logistics Network (ULN) X104. Project Cargo Forwarders and Heavy Transport: Independent freight forwarder cooperation network with project capability.
Universal Measurement System X98. Ship Registries and Flag States: Term used in the PC/UMS Panama Canal tonnage rules.
Universal Mill Plate B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Plate rolled with controlled edges.
Universal Modular Mast (UMM) X91. Submarines and Submarine Cable Systems: Mast architecture used for photonics, ESM, and communications on US Virginia-class submarines.
Universal Periodic Welfare Survey X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Triennial welfare-focused survey commissioned by MCG.
Universal Pipeline Pig X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Cleaning pig with adjustable disc configuration for varied pipeline diameters.
Universal Plate X9. Cargo Securing, Lashing and Stability Vocabulary: Multipurpose lashing attachment.
Universal precautions X36. Shipboard Medical, Telemedicine and Seafarer Health: Standard infection control practices including gloves, eye protection, and hand hygiene.
Universal primer X45. Marine Paints, Coatings and Antifouling: Surface-tolerant epoxy primer applied across a range of substrate conditions.
Universal Quick Joint (UQJ) X122. Submarine Cable Laying, Repair Vessels and Operators: SubCom quick-jointing variant for in-line repair work.
Universal Rule F4. Recreational Boating, Yachting and Sport: Nathaniel Herreshoff rating rule producing the J Class.
Universal Shipbuilding Corporation X58. Shipbuilding Yards and Construction: Former Japanese builder merged into Japan Marine United.
Universal Tankships Vetting X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: OCIMF SIRE inspection regime applied to bunker tankers above 500 dwt under VIQ.
Universal terminal X15. Ports, Terminals and Stevedoring: terminal accepting multiple cargo types and vessel classes.
Universal Time Coordinated (UTC) B3. Nautical Science: Reference timescale for navigation.
Universal Transverse Mercator (UTM) D2. Hydrography, tides, waves, bathymetry and marine geology: Coordinate system using a series of zones for mapping.
Universal Tugs Services (URS) X137. Harbour Tugs, Towage Operators and Tug Builders: West African harbour towage operator working ports such as Lagos, Lome and Cotonou.
Universal twistlock X76. Stevedoring, Lashing and Cargo Securing: Twistlock designed to fit both 20 ft and 40 ft adjacent container configurations.
Universidad de A Coruna Polytechnic University School of Naval Engineering X160. Maritime Academies, Universities, and STCW Certification: Spanish Ferrol campus naval and ocean engineering school.
Universidad de Cantabria Naval Engineering X160. Maritime Academies, Universities, and STCW Certification: Spanish university at Santander offering naval architecture and marine engineering degrees through its Higher Polytechnic School.
Universidad Maritima de Panama X121. Maritime Education, Academies and Universities: UMIP in Panama City, founded 2005, the national maritime university of Panama.
Universidad Maritima del Caribe X121. Maritime Education, Academies and Universities: UMC in Catia La Mar, Vargas, Venezuela, founded 2000, the national maritime university of Venezuela.
Universidad Politecnica de Madrid Naval Architecture (ETSIN) X160. Maritime Academies, Universities, and STCW Certification: Spanish UPM Madrid school of naval and ocean engineers founded in 1772.
University Maritime Advisory Services (UMAS) F3. Seafaring Life, Education, Professions and Institutions: UCL-affiliated maritime research consultancy.
University of Aberdeen Subsea Centre X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: UK academic research center supporting subsea pipeline integrity and cable engineering education.
University of Antwerp Department of Transport and Regional Economics X121. Maritime Education, Academies and Universities: Antwerp, Belgium, hosts the Maritime Economics and Logistics programs alongside Antwerp Maritime Academy.
University of Cebu Maritime Education and Training Center X160. Maritime Academies, Universities, and STCW Certification: Philippine private university in Cebu City delivering BSMT, BSMarE, and STCW programs.
University of Houston Marine Programs X121. Maritime Education, Academies and Universities: Texas regional logistics programs.
University of Plymouth X55. Marine Simulators, Training and Maritime Academies: English university with a School of Engineering, Computing and Mathematics offering navigation and ocean science programs.
University of Plymouth Marine Institute X121. Maritime Education, Academies and Universities: Founded 2007, parent of BSc Navigation and Maritime Science programs.
University of Plymouth Maritime Faculty F3. Seafaring Life, Education, Professions and Institutions: UK maritime academic provider.
University of Rhode Island Maritime Archaeology F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Graduate program in maritime history.
University of Rijeka Faculty of Maritime Studies X121. Maritime Education, Academies and Universities: See Croatian Maritime Faculty Rijeka.
University of Southampton Maritime Engineering X121. Maritime Education, Academies and Universities: See Southampton University Maritime Engineering Group.
University of Southern Denmark (SDU) Maritime X160. Maritime Academies, Universities, and STCW Certification: SDU Esbjerg and Sonderborg programs in marine science, offshore engineering, and maritime business.
University of Split Faculty of Maritime Studies X121. Maritime Education, Academies and Universities: See Croatian Maritime Faculty Split.
University of Strathclyde X55. Marine Simulators, Training and Maritime Academies: Scottish university in Glasgow with a Department of Naval Architecture, Ocean and Marine Engineering.
University of Strathclyde NAOME X121. Maritime Education, Academies and Universities: See Strathclyde University Department of Naval Architecture.
University of Tasmania X55. Marine Simulators, Training and Maritime Academies: Parent university of the Australian Maritime College in Launceston.
University of Tasmania Australian Maritime College X121. Maritime Education, Academies and Universities: See Australian Maritime College.
University of Trieste Maritime Faculty X121. Maritime Education, Academies and Universities: Italian maritime sciences and technology faculty.
University of Wollongong Australian National Centre for Ocean Resources and Security X121. Maritime Education, Academies and Universities: ANCORS, founded 1990, maritime policy and security research.
Uniwersytet Morski w Gdyni X121. Maritime Education, Academies and Universities: See Gdynia Maritime University.
UnLCC (Unconverted Line Commutated Converter) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: HVDC converter type used in older submarine interconnectors.
Unlimited CoC X21. STCW Certificates, Crewing and Seafarer Welfare: Certificate without tonnage or area restrictions, the highest STCW grade in its category.
Unloader X19. Engine Room Watchkeeping and UMS Operations: Compressor capacity control device opening discharge or suction valves.
Unloading Declaration X87. Fishing Vessels and Fisheries Management: Statement of species and quantities discharged at port, required under EU Regulation 1224/2009.
Unloading Operation Verification X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The SIRE chapter check covering discharge plan, line pressures, and stress monitoring.
Unloading Operations Manual X20. LNG Operations and Custody Transfer: Cargo officer reference detailing discharge sequences and vapor return procedures.
Unloading Plan X104. Project Cargo Forwarders and Heavy Transport: Document covering crane, trailer, and skidding moves at the destination port or site.
Unloading Plan Audit X5. Marine Surveying and Inspection: Review of bulk carrier loading plan to BLU Code limits.
Unloading rate X175. Port Engineering, Dredging, Breakwaters, and Quays: Cargo throughput of a quay expressed in tonnes or TEU per hour, used to size berths and aprons.
Unloading sequence X19. Engine Room Watchkeeping and UMS Operations: Generator load shedding scheme on overload or under frequency.
Unloading Tackle Disposal X50. Ship Recycling, Demolition and Hong Kong Convention: The Part III stores treatment of cargo handling slings, hooks, and ropes at delivery.
Unlocated Beacon X80. Maritime Search and Rescue Coordination: 406 MHz alert without resolved position pending further passes.
UNLOCODE C4. Ports, terminals and coastal/marine civil engineering: UN location code for ports and terminals.
Unmanned Aerial System X80. Maritime Search and Rescue Coordination: UAS increasingly used as SRU in coastal SAR.
Unmanned Bridge Standard X109. Maritime Autonomous Surface Ships and MASS Code: A draft and emerging set of technical requirements for vessels designed to operate without a continuously manned bridge.
Unmanned Influence Sweep System X77. Naval Mine Warfare and Mine Countermeasures: The Textron USV-based magnetic and acoustic sweep payload for the US Navy LCS MCM mission package.