Glossary

Maritime glossary, terms beginning with U

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

Showing 250 of 1137 terms (page 1 of 5).

U Boat Worx X125. Superyacht Industry, Builders and Brokers: Breda, Netherlands manufacturer of personal submersibles common on explorer yachts.
U-Boat F1. Maritime History: Imperial and Nazi German submarine, central to the Battle of the Atlantic.
U-Bolt Clamp X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Bolted clamp used in pipeline tie-in spools to secure jumpers.
U-bracket X38. Propellers, Stern Gear and Shaft Lines: Twin-strut shaft bracket used on some twin-screw ships in place of a single A-bracket.
U-OWC X57. Ocean Energy Beyond Wind: U-tube oscillating water column concept tested at small scale in Mediterranean breakwater installations.
U-type Scrubber X69. EGCS Scrubbers, SCR and Marine Air Emissions: Scrubber arrangement with the exhaust path forming a U or inverted U.
U-value X70. Reefer Containers and Cold Chain Shipping: Overall heat transfer coefficient of a reefer container's envelope, expressed in watts per square meter kelvin, a key insulation performance metric.
U.S. Coast Guard Auxiliary F4. Recreational Boating, Yachting and Sport: Volunteer organization with recreational boating focus.
U.S. Coast Guard Mooring Standards X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: 33 CFR and NVIC guidance applicable to US-flag ships and to terminals in US waters, complementing OCIMF MEG4 for international tanker terminals.
U.S. COGSA 1936 A5. Maritime Law, private and commercial: 46 USC App. 1300 et seq., implementing the Hague Rules in the USA.
U.S. Maritime Service Officers School X121. Maritime Education, Academies and Universities: WWII-era training reference, archival.
U.S. Person X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: Any U.S. citizen, lawful permanent resident, entity organized under U.S. law (including foreign branches), or any person in the United States.
U25 Sailing F4. Recreational Boating, Yachting and Sport: Under-25 sailing categories in many championships.
UAE Arbitration Law (Federal Law No. 6 of 2018) X152. Maritime Arbitration and Dispute Resolution: UAE statute based on the UNCITRAL Model Law, used for arbitrations seated onshore in the UAE.
UAE Cash-Buyer Cluster X118. Ship Recycling Yards, Beaches and Regulation: Concentration of cash-buyer offices in Dubai and Sharjah including GMS, Best Oasis, and Star Asia.
UAE Coast Guard X127. Maritime Security, Anti-Piracy and PMSCs: One of the contributors to floating armory regulation in international waters of the Gulf of Oman.
UAE Federal Arbitration Law X114. Maritime Arbitration and Shipping Law Firms: Federal Law Number 6 of 2018 governing arbitrations seated in the United Arab Emirates outside the financial free zones.
UAE Federal Transport Authority X98. Ship Registries and Flag States: Federal flag administration of the United Arab Emirates for ship registration.
UAE National Search and Rescue Center X80. Maritime Search and Rescue Coordination: UAE national SAR coordination centre under General Civil Aviation Authority.
UAE PSC X66. Port State Control and Regional MOUs: Riyadh MOU member State.
UAIS X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Universal AIS, the formal ITU term distinguishing the standardized system from earlier proprietary systems.
UAIS-A 5 X89. ECDIS and Bridge Equipment Makers: Tokyo Keiki Class A AIS transponder for SOLAS vessels.
UAN X103. US Inland Waterway Towing and Barge: Urea Ammonium Nitrate solution, a liquid fertilizer carried in inland tank barges.
UAS (Unmanned Aerial System) E3. Technology, digitalization and smart shipping: Drone used for ship/port surveillance/inspection.
UAS Maritime Integration X109. Maritime Autonomous Surface Ships and MASS Code: The use of unmanned aircraft from a MASS for over the horizon perception in defense and survey roles.
UASC Logistics X104. Project Cargo Forwarders and Heavy Transport: Former logistics arm of United Arab Shipping Company, no longer active under that name.
UAV Surveillance X126. Marine Oil Spill Response and OPRC Regimes: Unmanned aerial systems such as the Schiebel Camcopter S-100 contracted by EMSA for spill detection.
Uberrimae Fidei X4. Marine Insurance, P&I and Claims: utmost good faith, the historic basis of section 17 of the Marine Insurance Act 1906; modified by the Insurance Act 2015 for non-consumer business.
UBS Shipping X49. Ship Finance, Leasing and Maritime Capital Markets: Shipping finance and capital markets capability inherited and expanded following the 2023 Credit Suisse acquisition.
UC X126. Marine Oil Spill Response and OPRC Regimes: Unified Command, the ICS structure under which federal, state, tribal, and responsible party leadership share decision authority.
UCAV X11. Naval Vessels, Warship Systems and Naval Architecture: Unmanned combat aerial vehicle, e.g., MQ-25 Stingray tanker on USN CVN.
UCC C3. Logistics, freight forwarding and multimodal trade: Union Customs Code of the European Union.
UCEM-2000 X69. EGCS Scrubbers, SCR and Marine Air Emissions: ABB continuous emission monitoring system reference, used for SO2 and CO2 measurement.
UCL Marine Research Group X160. Maritime Academies, Universities, and STCW Certification: University College London Department of Mechanical Engineering's marine research group covering ship design, decarbonization, and marine systems.
UCO (Used Cooking Oil) X34. Decarbonization, Alternative Fuels and Carbon Pricing: Feedstock for FAME, HVO, and other waste-based biofuels.
UCOME X34. Decarbonization, Alternative Fuels and Carbon Pricing: Used cooking oil methyl ester; specific FAME subtype.
UCP 600 C3. Logistics, freight forwarding and multimodal trade: Uniform Customs and Practice for Documentary Credits.
UCR X6. Container, Intermodal and Trade Codes: Unique Consignment Reference, WCO data model identifier.
UCSB Eagle Scout fleet X128. Sail Training Ships and Tall Ship Associations: Not a sail training reference; excluded.
Udaloy class X11. Naval Vessels, Warship Systems and Naval Architecture: Soviet/Russian Project 1155 ASW destroyer.
Udaloy-class destroyer X106. Naval Surface Combatants: Russian Navy Project 1155 anti-submarine destroyer class displacing about 7,500 tons.
UDT X11. Naval Vessels, Warship Systems and Naval Architecture: Underwater Demolition Team, USN naval special warfare predecessor of SEAL.
UEC Engine X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Mitsubishi Heavy Industries Ube Engine Company two-stroke engine designs licensed for several Japanese builders, including UEC50LSII.
UEL X75. IMDG Code, Classes, Packing and Segregation: Upper Explosive Limit, the maximum concentration of a flammable gas in air supporting combustion.
UES X83. ISO Container Manufacturing and Leasing: United Equipment Services Holdings, a container leasing and trading company.
UF Membrane X63. Marine Auxiliary Machinery and Pumps: Ultrafiltration membrane used in advanced OWS and STP systems for fine separation.
UFC 3-260 X126. Marine Oil Spill Response and OPRC Regimes: US DoD pavement and airfield standard, relevant to staging-area construction.
Uffa Fox Trophy F4. Recreational Boating, Yachting and Sport: Historic dinghy class trophy.
UFL (Upper Flammable Limit) X1. Cargo Science, Commodities and Cargo Care: Maximum vapor concentration that will ignite.
UGM-109 Tomahawk X91. Submarines and Submarine Cable Systems: Submarine-launched variant designation of the Tomahawk cruise missile.
UGM-133 Trident II D5 X91. Submarines and Submarine Cable Systems: Submarine-launched ballistic missile in service with the US Navy and Royal Navy.
UGM-84 Harpoon X91. Submarines and Submarine Cable Systems: Submarine-launched anti-ship missile variant.
UGST X91. Submarines and Submarine Cable Systems: Russian heavyweight torpedo family designation, including USET-80 successor variants.
UHB X45. Marine Paints, Coatings and Antifouling: Ultra-High Build coating capable of application at very high film thickness in a single pass.
UHD X65. ROVs, AUVs, USVs and Marine Robotics: Schilling Robotics Ultra Heavy Duty work-class ROV with 220 horsepower hydraulic capacity.
Uhde Ammonia Process X140. Ammonia as Marine Fuel and Hydrogen Shipping: ThyssenKrupp Uhde dual-pressure synthesis loop in Yara and CF plants.
UHL X81. Project Cargo, Heavy-Lift and Module Carriers: United Heavy Lift, Bremen-based heavy-lift carrier specializing in F900 Eco-Lifter vessels.
UHL Fame X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHL Fierce X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHL Focus X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHL Fortune X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHL Fusion X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHL Future X81. Project Cargo, Heavy-Lift and Module Carriers: UHL F900 Eco-Lifter heavy-lift vessel.
UHP fuel pump B2. Marine Engineering: Ultra-high-pressure fuel pump for diesel injection (>1500 bar).
UHP Vapor Line X20. LNG Operations and Custody Transfer: High-pressure vapor return path from BOG compressor to engines or recondenser.
UHP water blasting X165. Marine Coatings, Antifouling, and Hull Husbandry: Ultra-high-pressure water jetting at 30,000 psi or above used for paint removal and salt decontamination.
UHP water jetting X45. Marine Paints, Coatings and Antifouling: Ultra-high-pressure water jetting at above 1700 bar, used for paint removal and surface preparation without abrasive.
UHT Cream X120. Marine Catering, Provisions and Ship Chandlers: IMPA 551006 long-life cream, 200 mL pack, ambient stable.
UI X142. Classification Societies and Class Notations: Unified Interpretation, IACS document harmonizing how member societies interpret IMO instruments.
UI SC X54. Naval Architecture Software and IACS Rules: IACS Unified Interpretation on the SOLAS Convention covering specific implementation issues.
UI SC180 X54. Naval Architecture Software and IACS Rules: IACS Unified Interpretation aligned with the IGC and IGF codes for gas-fueled ships.
UIC Code X83. ISO Container Manufacturing and Leasing: Identification code under International Union of Railways rules, used for swap bodies in European rail traffic.
UJ (Universal Joint) X122. Submarine Cable Laying, Repair Vessels and Operators: ASN-designed field joint family allowing on-board jointing of repeatered cable using a single tooling set across LW, SA and DA cables.
UK Arbitration Act 2025 X152. Maritime Arbitration and Dispute Resolution: New legislation reforming the English Arbitration Act 1996 with targeted amendments including a default rule that the law of the seat governs the arbitration agreement.
UK Border Force X130. National Coast Guards and Cutter Fleets: UK Home Office maritime command, established 2012, operates HMC Searcher, HMC Seeker, HMC Vigilant, HMC Valiant, HMC Active and HMC Protector.
UK Chamber of Shipping X154. Maritime Welfare, Seafarer Charities, and MLC Rights: British employer body engaging on MLC implementation and seafarer welfare with UK unions.
UK Chamber of Shipping Annual Dinner X119. Maritime Conferences, Trade Shows and Awards: Annual London event hosted at Grosvenor House.
UK Club X86. Port Agency, Husbandry and Disbursement: United Kingdom Mutual Steam Ship Assurance Association, an International Group P&I club.
UK Consolidated List X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The OFSI master list of designated persons under all UK sanctions regimes.
UK Defence Club X51. Maritime Arbitration, Law and BIMCO Clauses: A mutual FD&D insurance association covering legal costs of shipowner and charterer disputes.
UK Docks Marine Services X113. Drydock and Ship Repair Yards: British family-owned ship repair group with yards on the Tyne, Tees, and Aire River.
UK ETS D6. Decarbonization, emissions and alternative fuels: UK emissions trading scheme, with maritime inclusion under consideration.
UK Export Finance X49. Ship Finance, Leasing and Maritime Capital Markets: Modern name of the UK export credit agency, successor to ECGD.
UK Fisheries Act 2020 X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: UK primary statute post-Brexit setting eight fisheries objectives.
UK Hydrographic Office X27. Polar Code, Ice Navigation and Polar Operations: Source of Admiralty Sailing Directions NP10-NP13 for polar regions.
UK Marine Policy Statement X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: 2011 statement adopted under the Marine and Coastal Access Act setting MSP principles for UK waters.
UK Maritime Pilots' Association X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Professional body with welfare and benevolent provisions for pilots.
UK Maritime Services Ban X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The UK equivalent to EU Article 3n, prohibiting maritime services for Russian oil above the price cap.
UK MCA X21. STCW Certificates, Crewing and Seafarer Welfare: United Kingdom Maritime and Coastguard Agency.
UK MCA (Maritime and Coastguard Agency) X36. Shipboard Medical, Telemedicine and Seafarer Health: UK flag-state authority responsible for ENG 1 standards and ship medical chest regulations.
UK MTO (United Kingdom Maritime Trade Operations) E1. Maritime security, geopolitics and risk: Royal Navy liaison cell at Dubai.
UK P&I X36. Shipboard Medical, Telemedicine and Seafarer Health: P&I club operating PEME scheme worldwide.
UK P&I Club X4. Marine Insurance, P&I and Claims: United Kingdom Mutual Steam Ship Assurance Association, founded 1869, International Group member.
UK PandI Club F3. Seafaring Life, Education, Professions and Institutions: London-based protection and indemnity mutual.
UK Russia Regulations (2019, as amended) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The legal instrument carrying UK Russia sanctions, amended dozens of times since 2022.
UK Sailing Academy F4. Recreational Boating, Yachting and Sport: Cowes-based training center.
UK Salvage Association X167. Major Salvage Companies, Wreck Removals, and Equipment: Marine surveyors association founded in London in 1856, providing salvage and damage surveys.
UK Ship Recycling Strategy 2007 X118. Ship Recycling Yards, Beaches and Regulation: UK government strategy paper on ship recycling, anchoring EU-aligned policy for UK-flag tonnage.
UK Ship Register X29. Ship Sale and Purchase, Management Contracts and Valuation: UK national flag register administered by MCA.
UK Sulphur Regulations X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: National enforcement instruments of MARPOL Annex VI Reg 14 in the United Kingdom; not a MARPOL instrument per se but the national enforcement chain.
UK Tonnage Tax X98. Ship Registries and Flag States: Tonnage tax regime introduced by the Finance Act 2000 in the United Kingdom.
UK War Risks Club X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Mutual war risks association managed by Thomas Miller.
UK-Continent X44. Shipping Indices, FFAs and Freight Markets: Geographical discharge or loading range covering ports from Hamburg to Le Havre, used in numerous Baltic tanker and dry bulk routes.
UKAHT X97. Polar Expedition Cruise and IAATO Operations: UK Antarctic Heritage Trust, which manages Port Lockroy and other British Antarctic heritage sites.
UKAS Accredited Class X40. Tanker Vetting, SIRE and VIQ: A classification society accredited under the UK Accreditation Service, occasionally referenced as a quality indicator.
UKC C4. Ports, terminals and coastal/marine civil engineering: Under keel clearance, static or dynamic.
UKC (Under Keel Clearance) B3. Nautical Science: Vertical distance keel-to-seabed.
UKCS X14. Offshore Oil and Gas Marine Operations: United Kingdom Continental Shelf.
UKHO D2. Hydrography, tides, waves, bathymetry and marine geology: United Kingdom Hydrographic Office, publisher of Admiralty charts.
UKHO (United Kingdom Hydrographic Office) X16. Nautical Science, Navigation and COLREGs: Producer of Admiralty charts and publications.
UKHO Admiralty Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Sailing Direction publication series listing pilotage information by region, separate from but referenced by pilots.
UKHO Bathymetric Data Portal X129. Hydrographic Offices, Survey Vessels and Marine Cartography: UKHO platform sharing publicly releasable bathymetric datasets in support of MSDI and Seabed 2030.
UKHO casualty notice X12. Maritime Casualties and Investigation: Notice to Mariners issued by the UK Hydrographic Office on wreck or obstruction after a casualty.
UKHO Charts X146. Port State Control Regimes, MoUs, and Inspection Systems: United Kingdom Hydrographic Office charts, the most commonly verified paper publication at PSC inspections.
UKHO Data Quality Assessment Standard (DQA) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Internal UKHO methodology for evaluating third-party survey data prior to ingest into the National Marine Bathymetry Database.
UKHO ENC (yard) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Charts used during sea trial.
UKHO INSPIRE Portal X129. Hydrographic Offices, Survey Vessels and Marine Cartography: UKHO service exposing marine spatial data products compliant with the EU INSPIRE Directive.
UKHO Notice X13. Marine Salvage and Wreck Removal: Hydrographic warning of wreck location for safe navigation.
UKHO Taunton X129. Hydrographic Offices, Survey Vessels and Marine Cartography: United Kingdom Hydrographic Office headquarters at Admiralty Way, Taunton, Somerset, established in 1795 and producing the ADMIRALTY chart and publication portfolio.
UKMPA X102. Seafarer Welfare and Maritime Charities: United Kingdom Maritime Pilots' Association, the trade body for UK marine pilots.
UKMTO X22. Piracy, Maritime Security and Armed Protection: United Kingdom Maritime Trade Operations, Royal Navy facility in Dubai liaising with merchant shipping.
UKMTO (UK Maritime Trade Operations) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The transit-coordination authority whose reporting status is verified for HRA-transiting vessels.
UKMTO Voluntary Reporting Area X127. Maritime Security, Anti-Piracy and PMSCs: VRA covering area from Suez and Bab-el-Mandeb to 78 degrees east and from 10 degrees south to 23 degrees north.
UKMTO Voluntary Reporting Area (VRA) E1. Maritime security, geopolitics and risk: Indian Ocean area for vessel reporting.
Ukraine PSC X66. Port State Control and Regional MOUs: Black Sea MOU member State.
Ukrainian Seafarers Welfare X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Welfare focus area after 2022, addressing crew change, payment routes, and family welfare for Ukrainian and Russian seafarers.
Ula class X11. Naval Vessels, Warship Systems and Naval Architecture: Royal Norwegian Navy diesel-electric submarine.
ULCC X81. Project Cargo, Heavy-Lift and Module Carriers: Ultra Large Crude Carrier, the largest crude tanker category, occasionally converted to FPSO or FSO service.
ULCC (Ultra Large Crude Carrier) B5. Ship Types and Individual Vessels: >320,000 DWT crude tanker.
ULCC Cargo Pumping X63. Marine Auxiliary Machinery and Pumps: High-capacity steam-turbine driven centrifugal pumps used on ultra-large crude carriers.
ULCC Drydock X113. Drydock and Ship Repair Yards: Drydocks of more than approximately 600,000 dwt capacity at Hanwha Ocean Geoje, HD Hyundai Ulsan, and Drydocks World Dubai.
ULCS C3. Logistics, freight forwarding and multimodal trade: Ultra Large Container Ship, above about 18,000 TEU.
ULCS/ULCV (Ultra Large Container Vessel) B5. Ship Types and Individual Vessels: >14,500 TEU container ship.
ULCV X6. Container, Intermodal and Trade Codes: Ultra Large Container Vessel, generally above 14,500 TEU.
ULD X6. Container, Intermodal and Trade Codes: Unit Load Device, in air freight, sometimes interlined with sea-air containers.
ULDB, Ultra Light Displacement Boat F4. Recreational Boating, Yachting and Sport: Sled-style 1980s offshore racer.
ULEV X69. EGCS Scrubbers, SCR and Marine Air Emissions: Ultra Low Emission Vessel, a market designation for ships with very low local pollutant emissions.
Uljanik Shipyard X137. Harbour Tugs, Towage Operators and Tug Builders: Croatian builder which has produced a few tug newbuilds.
Ulju Class X126. Marine Oil Spill Response and OPRC Regimes: Korean Coast Guard response vessel class.
Ullage C1. Commercial shipping, chartering, economics and finance: Empty space above liquid cargo in a tank.
Ullage report X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Pre- and post-transfer record of ullages in delivering and receiving tanks.
Ullage Survey X5. Marine Surveying and Inspection: Quantity determination using ullages on liquid cargo or bunker tanks.
Ullage Tape X115. Marine Bunker and Cargo Surveying: Calibrated tape with marker used to measure ullage through a gauging hatch or vapor lock.
Ulrich X124. Dredging Industry and Reclamation Contractors: USACE Galveston District dredging supervisor archetype.
Ulsan X58. Shipbuilding Yards and Construction: South Korean city hosting HHI and Hyundai Mipo Dockyard.
Ulsan Pilots X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: KMPA branch handling tankers, LNG carriers, and product tankers at South Korea's largest petrochemical port.
Ulsan Shipyard X113. Drydock and Ship Repair Yards: HD Hyundai Heavy Industries Ulsan complex with ten drydocks, the world's largest single shipbuilding and repair site.
Ulsan-class X62. Naval Warships and Combat Systems: Republic of Korea Navy FFX-I frigate program led by ROKS Incheon (FFG-811).
Ulsan-class frigate X106. Naval Surface Combatants: Republic of Korea Navy FFX-III Batch III guided-missile frigate program.
ULSFO X72. Bunkering Hubs and Bunker Suppliers: Ultra low sulfur fuel oil with maximum 0.10 percent sulfur supplied for use in emission control areas.
ULSFO (Ultra Low Sulfur Fuel Oil) X34. Decarbonization, Alternative Fuels and Carbon Pricing: 0.10% sulfur compliant residual fuel; similar GHG intensity to HFO.
ULSFO (Ultra Low Sulphur Fuel Oil) X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Residual or hybrid fuel with sulphur not exceeding 0.10% m/m for ECA use.
Ulstein X42. Offshore Wind Installation and Cable Lay: Norwegian shipbuilder and design house active in offshore wind support vessel design.
Ulstein design X57. Ocean Energy Beyond Wind: Vessel architecture used in several offshore renewable and CCS service vessels, including X-Bow hull forms.
Ulstein Power and Control Systems X27. Polar Code, Ice Navigation and Polar Operations: Supplier of DP-Ice solutions for offshore polar operations.
Ulstein SX195 X123. Offshore Wind Installation Vessels and Operators: Walk-to-work SOV design used for Acta Marine vessels, 93 m length with motion-compensated gangway.
Ulstein UCN propulsion X38. Propellers, Stern Gear and Shaft Lines: Ulstein Power & Control historically supplied controllable pitch and azimuth thrusters; some product lines now within other groups.
Ulstein Verft X97. Polar Expedition Cruise and IAATO Operations: Norwegian shipyard that built the first X-Bow expedition cruise ships starting with Greg Mortimer in 2019.
Ulstein X-Bow X164. Cruise Industry, Brands, Ship Classes, and Terminals: The inverted bow design used on the Greg Mortimer, Sylvia Earle, and other expedition vessels, originally developed by Norway's Ulstein Group.
Ulster Steamship Company X39. Pre-1900 Maritime History: Belfast-based shipping company founded by G. Heyn in 1825.
Ultim X84. Yacht Racing, Regattas and Sailing Governance: A class of 32-meter ocean-racing trimarans, used in events such as the Route du Rhum Ultim category.
Ultimate Beneficial Owner (UBO) X29. Ship Sale and Purchase, Management Contracts and Valuation: Natural person ultimately owning the buying or selling entity.
Ultimate hull girder strength X162. Naval Architecture, Stability, Resistance, and Structural Design: Maximum longitudinal bending moment the hull girder can sustain before collapse, computed by progressive collapse methods (Smith method, ALPS/HULL, MAESTRO).
Ultimate limit state X42. Offshore Wind Installation and Cable Lay: Design check against structural collapse under extreme loads.
Ultimate Net Loss (UNL) X117. Marine Insurance Markets, Captives and Reinsurance: The total loss paid by an insurer net of all recoveries, the typical reinsurance loss definition.
Ultimate Strength Analysis X54. Naval Architecture Software and IACS Rules: Nonlinear collapse analysis of hull girder per CSR-BC+OT Chapter 9.
Ultra Low Sulfur Fuel Oil X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: ULSFO with 0.10 percent maximum sulfur, used in ECAs as an alternative to MGO.
Ultra low sulfur fuel oil (ULSFO) X47. Marine Fuel Quality and ISO 8217: Residual or hybrid fuel with sulfur content at or below 0.10 percent for SECA compliance.
Ultra-Deep Submarine Pipeline X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Pipeline installed in water depths beyond 2,500 m, requiring J-lay or reel-lay vessels and high-strength linepipe.
Ultra-Deepwater Cable X91. Submarines and Submarine Cable Systems: Cable variant designed for water depths beyond 4,000 m.
Ultra-Deepwater Drillship E4. Cruise, offshore energy and auxiliary/specialised fleets: Drillship rated for water depths beyond 7,500 ft.
Ultra-Harsh Environment Semisubmersible X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Sixth or seventh-generation semisubmersible designed for North Atlantic and Barents Sea conditions.
Ultra-Large Crude Carrier (ULCC) E4. Cruise, offshore energy and auxiliary/specialised fleets: Tanker over 320,000 DWT.
Ultra-low temperature (ULT) shipment X26. Reefer Containers and Cold Chain Logistics: Cargo carried at -60 to -80 C, e.g., COVID-19 mRNA vaccines via specialized active containers and dry ice.
Ultramarine X97. Polar Expedition Cruise and IAATO Operations: Quark Expeditions polar expedition ship delivered in 2021 with 199 PAX, equipped with twin helicopters.
Ultramax X44. Shipping Indices, FFAs and Freight Markets: Dry bulk carrier of approximately 60,000 to 65,000 deadweight tons, a larger evolution of the Supramax design.
Ultramax bulker X15. Ports, Terminals and Stevedoring: ~63,000-65,000 dwt geared bulk carrier, common at multipurpose berths.
Ultraship Marine Salvage X167. Major Salvage Companies, Wreck Removals, and Equipment: Reference smaller salvage operator.
Ultrasonic Flow Meter X63. Marine Auxiliary Machinery and Pumps: Non-intrusive flow meter applied to OWS, ballast, and bunker lines.
Ultrasonic Hatch Tightness Test X155. Marine Surveying Practice and Cargo Inspection: A measurement of acoustic energy leakage from inside a closed hatch to detect gasket discontinuities, accepted by classification societies as equivalent to hose testing.
Ultrasonic Survey X43. Marine Surveying and Warranty Surveying: A specific NDT technique using high-frequency sound waves to measure thickness or detect flaws in steel and welds.
Ultrasonic testing X58. Shipbuilding Yards and Construction: NDT method using high-frequency sound to detect weld and plate defects.
Ultrasonic Testing (UT) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: NDT thickness and flaw detection.
Ultrasonic thickness gauge X45. Marine Paints, Coatings and Antifouling: Instrument used to measure coating thickness on non-ferrous substrates and steel plate thickness in ship surveys.
Ultrasonic Thickness Gauging X96. Hull Integrity Monitoring and Strain Gauges: Non-destructive measurement of plate thickness using ultrasonic pulse echo techniques for corrosion assessment.
Ultrasonic Thickness Gauging (UTG) X5. Marine Surveying and Inspection: NDT method measuring plate thickness via ultrasonic pulse echo.
Ultrasonic Thickness Measurement X142. Classification Societies and Class Notations: Standard NDT method for assessing remaining plate thickness.
Ultraviolet (UV) BWMS X18. Ballast Water, Biofouling and Antifouling: Treatment using UV-C light (low or medium pressure) to inactivate organisms.
Ultraviolet (UV) Disinfection X41. Cruise Ship Public Health and VSP/USPH: Non-residual disinfection used as a secondary barrier in recreational water and certain potable installations.
Ultraviolet fluorescence X47. Marine Fuel Quality and ISO 8217: Sulfur analysis principle used in ISO 20846 method.
Uluburun Shipwreck F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Late Bronze Age trader off southern Anatolia, c. 1320 BCE.
Uluburun Wreck F1. Maritime History: Late Bronze Age wreck off Anatolia, c. 1320 BCE.
Ulva X165. Marine Coatings, Antifouling, and Hull Husbandry: Genus of green macroalgae responsible for soft fouling of slow-moving hulls.
ULY (Unrestricted Large Yacht) X156. Superyacht Industry, Builders, and Yacht Charter Market: REG status indicating a Large Yacht Code commercial yacht authorized for unlimited international service.
Ulysses X125. Superyacht Industry, Builders and Brokers: 116.2 m Kleven Verft (with Fincantieri brand association) delivered 2016 to Graeme Hart, with helicopter hangar.
Ulysses (heritage) X128. Sail Training Ships and Tall Ship Associations: Various sail training vessels carry the name; the Ulysses fleet of Italian Coast Guard training yachts is used for cadet sail experience.
Umbilical X14. Offshore Oil and Gas Marine Operations: Composite hose/cable bundle (electric, hydraulic, chemical, fiber).
Umbilical Lay Vessel X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Vessel equipped with carousels and tensioners specifically configured for subsea umbilical installation.
Umbilical Length X82. Saturation Diving and Offshore Diving Operations: Operational excursion radius of a working diver from the bell.
Umbilical Tender X82. Saturation Diving and Offshore Diving Operations: Crew member feeding and recovering diver umbilical.
Umbrella tender X124. Dredging Industry and Reclamation Contractors: Multi-project framework agreement used by USACE and Rijkswaterstaat.
Umfolozi tidal study X57. Ocean Energy Beyond Wind: Generic placeholder for African tidal energy resource investigations.
UMISAS 120 X77. Naval Mine Warfare and Mine Countermeasures: An ECA Group synthetic aperture sonar with 120 kHz center frequency for AUV minehunting.
UMISAS 240 X77. Naval Mine Warfare and Mine Countermeasures: An ECA Group higher-frequency synthetic aperture sonar variant for finer resolution in shallow water.
Umpire X114. Maritime Arbitration and Shipping Law Firms: Third arbitrator in two-arbitrator tribunals who decides if the original two arbitrators disagree, available under Sections 15 to 22 of the English Arbitration Act 1996.
UMR X103. US Inland Waterway Towing and Barge: See Upper Mississippi River.
UMS X8. IACS, Class Rules and Class Notations: Unattended Machinery Space class notation.
UMS round X19. Engine Room Watchkeeping and UMS Operations: Daily ER inspection by duty engineer covering all spaces and machinery.
UMS test X19. Engine Room Watchkeeping and UMS Operations: Weekly functional test of engineers' alarm, dead man system, and emergency stops.
UN 1001 X75. IMDG Code, Classes, Packing and Segregation: Acetylene dissolved Class 2.1.
UN 1005 X75. IMDG Code, Classes, Packing and Segregation: Ammonia anhydrous Class 2.3 with Class 8 subsidiary risk.
UN 1006 X75. IMDG Code, Classes, Packing and Segregation: Argon compressed Class 2.2.
UN 1011 X75. IMDG Code, Classes, Packing and Segregation: Butane Class 2.1.
UN 1017 X75. IMDG Code, Classes, Packing and Segregation: Chlorine Class 2.3 with Class 8 subsidiary risk.
UN 1040 X75. IMDG Code, Classes, Packing and Segregation: Ethylene oxide Class 2.3 with Class 2.1 subsidiary risk.
UN 1049 X75. IMDG Code, Classes, Packing and Segregation: Hydrogen compressed Class 2.1.
UN 1066 X75. IMDG Code, Classes, Packing and Segregation: Nitrogen compressed Class 2.2.
UN 1066 Nitrogen Compressed X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 2.2 non-flammable non-toxic compressed gas.
UN 1072 X75. IMDG Code, Classes, Packing and Segregation: Oxygen compressed Class 2.2 with Class 5.1 subsidiary risk.
UN 1075 X75. IMDG Code, Classes, Packing and Segregation: Petroleum gases liquefied Class 2.1.
UN 1075 Petroleum Gases Liquefied X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 2.1 LPG mixture.
UN 1076 X75. IMDG Code, Classes, Packing and Segregation: Phosgene Class 2.3 with Class 8 subsidiary risk.
UN 1079 X75. IMDG Code, Classes, Packing and Segregation: Sulfur dioxide Class 2.3 with Class 8 subsidiary risk.
UN 1090 X75. IMDG Code, Classes, Packing and Segregation: Acetone Class 3 PG II.
UN 1098 X75. IMDG Code, Classes, Packing and Segregation: Allyl alcohol Class 6.1 with Class 3 subsidiary risk.
UN 1114 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to benzene under the UN Recommendations on the Transport of Dangerous Goods.
UN 1170 X75. IMDG Code, Classes, Packing and Segregation: Ethanol Class 3 PG II or III.
UN 1170 Ethanol or Ethanol Solution X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG II or III depending on concentration and flashpoint.
UN 1184 X93. IBC Code and Chemical Tanker Operations: United Nations number historically assigned to ethylene dichloride; reference here disambiguates between competing common assignments for latex.
UN 1193 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to methyl ethyl ketone under the UN Recommendations on the Transport of Dangerous Goods.
UN 1198 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to formaldehyde solutions, flammable, under the UN Recommendations.
UN 1202 X75. IMDG Code, Classes, Packing and Segregation: Gas oil or diesel fuel or heating oil light Class 3 PG III.
UN 1202 Diesel Fuel X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 flammable liquid PG III.
UN 1203 X75. IMDG Code, Classes, Packing and Segregation: Gasoline Class 3 PG II.
UN 1203 Motor Spirit (Gasoline) X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG II.
UN 1219 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to isopropanol under the UN Recommendations on the Transport of Dangerous Goods.
UN 1223 Kerosene X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG III.
UN 1230 X75. IMDG Code, Classes, Packing and Segregation: Methanol Class 3 with Class 6.1 subsidiary risk PG II.
UN 1234 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to methylal under the UN Recommendations on the Transport of Dangerous Goods.
UN 1247 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to methyl methacrylate monomer, stabilized, under the UN Recommendations.
UN 1263 X75. IMDG Code, Classes, Packing and Segregation: Paint Class 3 with PG by flash point and viscosity.
UN 1263 Paint or Paint Related Material X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG I, II, or III based on flashpoint.
UN 1267 X75. IMDG Code, Classes, Packing and Segregation: Petroleum crude oil Class 3.
UN 1267 Petroleum Crude Oil X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG I, II, or III based on properties.
UN 1268 X75. IMDG Code, Classes, Packing and Segregation: Petroleum distillates NOS Class 3.
UN 1268 Petroleum Distillates NOS X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Class 3 PG I, II, or III.
UN 1294 X75. IMDG Code, Classes, Packing and Segregation: Toluene Class 3 PG II.
UN 1295 X75. IMDG Code, Classes, Packing and Segregation: Trichlorosilane Class 4.3 with Class 3 and 8 subsidiary risks.
UN 1297 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to trimethylamine, aqueous solution, under the UN Recommendations.
UN 1307 X93. IBC Code and Chemical Tanker Operations: United Nations number assigned to xylenes under the UN Recommendations on the Transport of Dangerous Goods.