Glossary

Maritime glossary, terms beginning with U (page 4)

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

Showing 250 of 1137 terms (page 4 of 5).

Unmanned machinery space C2. Ship operations, crewing and technical management: UMS class notation.
Unmanned Machinery Space (UMS) X156. Superyacht Industry, Builders, and Yacht Charter Market: Class notation for periodically unattended machinery spaces fitted on most superyachts above 500 GT.
Unmanned Surface Vehicle X109. Maritime Autonomous Surface Ships and MASS Code: A general term for a surface vessel operating without onboard crew, encompassing many research and commercial platforms.
Unmanned Surface Vehicle MCM X77. Naval Mine Warfare and Mine Countermeasures: The use of USVs as host platforms for influence sweeps, sonar tow bodies, and disposal vehicles in offboard MCM concepts.
Unmanned Surface Vehicle Operator F3. Seafaring Life, Education, Professions and Institutions: Emerging maritime profession.
Unmanned Surface Vessel (USV) E3. Technology, digitalization and smart shipping: Autonomous or remotely operated surface craft.
Unmanned Undersea Vehicle MCM X77. Naval Mine Warfare and Mine Countermeasures: The use of UUVs such as Knifefish and AUV62-MR for minefield reconnaissance and classification.
Unmanned Underwater Vehicle (UUV) X91. Submarines and Submarine Cable Systems: Autonomous or remotely operated underwater vehicle deployable from submarines or surface ships.
Unmanned Wellhead Platform X14. Offshore Oil and Gas Marine Operations: Normally unattended installation, NUI.
Unmoor F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Procedure to weigh both anchors and prepare to leave anchorage.
UNODC GMCP X127. Maritime Security, Anti-Piracy and PMSCs: UN Office on Drugs and Crime Global Maritime Crime Programme, supports prosecution and prison transfer programmes in Seychelles, Kenya and Mauritius.
Unpackaged Articles X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Large robust articles transported without packaging under Chapter 4.1.3.8 for certain Class 1 articles or unpackaged solids.
Unpaid Wages Recovery X154. Maritime Welfare, Seafarer Charities, and MLC Rights: ITF Inspectorate function recovering hundreds of millions of US dollars in unpaid wages over the decades.
Unpriced Item, Demolition MoA X50. Ship Recycling, Demolition and Hong Kong Convention: A vessel component excluded from the demolition pricing formula, such as bunkers or specific equipment.
Unrated X39. Pre-1900 Maritime History: Royal Navy vessel below sixth rate, including sloops, gun brigs, and cutters.
Unreasonable behaviour costs X152. Maritime Arbitration and Dispute Resolution: Costs ordered against a party for procedural conduct departing from reasonable standards; available under section 61 English Arbitration Act 1996 in tribunal's discretion.
Unrecovered Aggregate X117. Marine Insurance Markets, Captives and Reinsurance: The portion of an aggregate excess of loss treaty layer not yet eroded by losses.
Unreeve X3. Ship Handling, Seamanship and Deck Vocabulary: Withdraw a rope from a block.
Unregulated Fishing X87. Fishing Vessels and Fisheries Management: Fishing in areas or for stocks where no measures apply, the U of IUU.
UNREP X11. Naval Vessels, Warship Systems and Naval Architecture: Underway Replenishment.
Unrepaired Damage X4. Marine Insurance, P&I and Claims: damage not repaired before sale or end of policy, recoverable in part under ITC Hulls 1/10/83 clause 18.
Unrepeatered System X91. Submarines and Submarine Cable Systems: Submarine cable system without in-line amplifiers, typical of regional or festoon installations.
Unreported Catch D4. Fisheries, aquaculture, blue economy and marine resources: Catch not declared to authorities.
Unreported Fishing X87. Fishing Vessels and Fisheries Management: Fishing not reported, or misreported, to relevant authorities, the second U of IUU.
Unrestricted service B1. Naval Architecture: Operational notation without ocean-area restriction.
Unrestricted Service Crane X104. Project Cargo Forwarders and Heavy Transport: Crane configuration approved for use without site-specific derating.
Unrestricted Submarine Warfare F1. Maritime History: Imperial German policy of 1917.
Unsafe act X12. Maritime Casualties and Investigation: Operator-level error or violation as classified in HFACS analysis.
Unsafe condition X12. Maritime Casualties and Investigation: Workplace, equipment, or environmental factor predisposing the casualty.
Unsafe ladder X32. Marine Pilotage and Pilot Operations: Pilot ladder not complying with SOLAS V/23, grounds for the pilot to refuse boarding.
Unsaturated zone (CCS) X57. Ocean Energy Beyond Wind: Shallow subsurface monitoring target for above-zone leak detection at offshore stores.
Unscheduled Inspection X40. Tanker Vetting, SIRE and VIQ: A SIRE inspection raised at short notice, for example in response to an incident or trading change.
Unscheduled maintenance X59. Offshore Wind O&M, CTVs and SOVs: Corrective interventions triggered by faults or alarms outside the planned maintenance program.
Unscheduled Port Call X86. Port Agency, Husbandry and Disbursement: Unplanned port call due to operational or emergency reasons.
Unscheduled Survey X43. Marine Surveying and Warranty Surveying: A class or commercial inspection triggered by an event such as damage or modification outside the normal survey programme.
UNSCR 1718 (2006) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The UN Security Council resolution establishing DPRK sanctions, expanded by successive resolutions.
UNSCR 1816 X127. Maritime Security, Anti-Piracy and PMSCs: 2 June 2008 resolution authorizing states to enter Somali territorial waters to repress piracy, with TFG consent.
UNSCR 1838 X127. Maritime Security, Anti-Piracy and PMSCs: 7 October 2008 calling on states with naval assets to deploy in the region.
UNSCR 1846 X127. Maritime Security, Anti-Piracy and PMSCs: 2 December 2008 extending UNSCR 1816 for 12 months.
UNSCR 1851 X127. Maritime Security, Anti-Piracy and PMSCs: 16 December 2008 authorizing land-based operations against pirate facilities in Somalia.
UNSCR 1897 X127. Maritime Security, Anti-Piracy and PMSCs: 30 November 2009 12-month extension.
UNSCR 1950 X127. Maritime Security, Anti-Piracy and PMSCs: 23 November 2010 12-month extension.
UNSCR 2018 X127. Maritime Security, Anti-Piracy and PMSCs: 31 October 2011 on Gulf of Guinea piracy.
UNSCR 2039 X127. Maritime Security, Anti-Piracy and PMSCs: 29 February 2012 follow-up Gulf of Guinea resolution.
UNSCR 2270 (2016) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The DPRK resolution introducing the cargo-inspection requirement on all goods to and from North Korea.
UNSCR 2321 (2016) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The DPRK resolution expanding the coal cap and adding shipping designations.
UNSCR 2371 (2017) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The DPRK resolution banning all coal, iron, lead, and seafood exports and capping numbers of DPRK workers abroad.
UNSCR 2375 (2017) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The DPRK resolution capping refined-petroleum imports at 500,000 barrels per year and authorizing inspection of suspect vessels.
UNSCR 2397 (2017) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The DPRK resolution capping crude imports at 4 million barrels per year and tightening shipping prohibitions, with vessel-listing annexes.
UNSCR 2634 X127. Maritime Security, Anti-Piracy and PMSCs: 31 May 2022 first standalone Gulf of Guinea operative resolution.
UNSCR 2722 X127. Maritime Security, Anti-Piracy and PMSCs: 10 January 2024 condemning Houthi attacks on shipping in the Red Sea.
Unsealed Sample X115. Marine Bunker and Cargo Surveying: Sample bottle without a tamper-evident seal, generally not accepted as evidence in commercial disputes.
Unseaworthiness X53. Marine Insurance, P&I and Hull Clauses: The state of the vessel being unfit for the contemplated voyage, with insurance consequences depending on whether the policy is time or voyage and on the assured's privity.
Unship X3. Ship Handling, Seamanship and Deck Vocabulary: Remove from working position.
Unstabilized X75. IMDG Code, Classes, Packing and Segregation: Without inhibitor against polymerization, often increases hazard and may forbid transport for some substances.
Unstable fuel X47. Marine Fuel Quality and ISO 8217: Residual fuel whose asphaltene phase has separated or is at risk of separating, evidenced by elevated TSA and poor spot test rating.
Unsteady blade loading X38. Propellers, Stern Gear and Shaft Lines: Time-varying blade force generated by passage of the blade through a non-uniform wake.
Unstructured Mesh X54. Naval Architecture Software and IACS Rules: Tetrahedral or polyhedral mesh used by STAR-CCM+, Fluent, and OpenFOAM for ship CFD.
Unstuff X6. Container, Intermodal and Trade Codes: Synonym for stripping a container.
Unterweser Reederei X79. Tugs and Towage Industry: URAG, Bremen-based German towage and offshore operator.
Untreated Ballast Test X5. Marine Surveying and Inspection: Sample analysis confirming BWMS bypass non-compliance.
Unverified emissions estimate (EU MRV) X34. Decarbonization, Alternative Fuels and Carbon Pricing: Default conservative estimate applied by the verifier when data is incomplete.
Up and down X3. Ship Handling, Seamanship and Deck Vocabulary: Anchor cable vertical, anchor just clear of the bottom.
Up to good safe port C1. Commercial shipping, chartering, economics and finance: Charter language warranting safe port nominations.
Up-and-Down Anchor F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Anchor cable vertical, indicating anchor about to be tripped.
Up-stand quay C4. Ports, terminals and coastal/marine civil engineering: Quay with curb upstand for trafficked area separation.
Update X73. Marine Hydrography, Charting and ENC: A .001 or higher S-57 file updating a base ENC cell.
Update of IHM Part I X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Continuous maintenance obligation following any installation, replacement, or removal of hazardous-substance-containing items.
Update training X21. STCW Certificates, Crewing and Seafarer Welfare: STCW Regulation I/11 refresher required at intervals of not more than 5 years.
Updated Advisory (October 12 2023) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes: The Coalition's revised price-cap guidance tightening attestations and adding red-flag indicators for service providers.
Updated Cost Forecast X86. Port Agency, Husbandry and Disbursement: Revised cost forecast during the call as new information emerges.
Updated Drawings Verification X5. Marine Surveying and Inspection: Confirmation that as-built drawings on board are current.
Updated ETA Submission X86. Port Agency, Husbandry and Disbursement: Submission of updated ETA to authorities and counterparties.
Updated ETD Submission X86. Port Agency, Husbandry and Disbursement: Submission of updated ETD to authorities and counterparties.
Updated VIQ X40. Tanker Vetting, SIRE and VIQ: A revision of the VIQ issued by OCIMF, identified by edition number such as VIQ7.
Updating Cycle X73. Marine Hydrography, Charting and ENC: The maintenance cycle by which an HO issues NMs and ENC updates, typically weekly.
Updating of IHM Part I X28. Ship Recycling and End-of-Life: Inclusion of materials introduced through repairs, modifications, or new installations.
Updating Training X160. Maritime Academies, Universities, and STCW Certification: STCW Manila Amendments mandated refresher every five years for certain endorsements such as PSCRB, FRB, AFF, and PST.
Updating, drawing X58. Shipbuilding Yards and Construction: Revision of construction drawings to reflect approved engineering changes.
Upender X42. Offshore Wind Installation and Cable Lay: Hydraulic frame rotating a blade or monopile from horizontal to vertical during installation.
Upfront Equity X49. Ship Finance, Leasing and Maritime Capital Markets: Equity required to be contributed at closing of a project financing.
Upgraded Inspector (SIRE 2.0) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: An inspector who has completed transition training from SIRE 1.0 to SIRE 2.0.
Upgrading Survey X43. Marine Surveying and Warranty Surveying: An attendance during a vessel conversion or upgrade to verify compliance with new class notations or service requirements.
Upholder/Victoria class X11. Naval Vessels, Warship Systems and Naval Architecture: Royal Navy SSK transferred to Royal Canadian Navy.
Uplift X6. Container, Intermodal and Trade Codes: Picking up of a loaded container from shipper or terminal.
Uplift (Article 14) X99. Marine Salvage Awards and SCOPIC: Increment of up to 30% over expenses, or up to 100% in exceptional cases, for environmental salvage.
Uplift (SCOPIC Clause 6) X99. Marine Salvage Awards and SCOPIC: Twenty-five percent daily increment on SCOPIC tariff rates as the salvor's profit element.
Uplift (Tectonic) D2. Hydrography, tides, waves, bathymetry and marine geology: Vertical rise of crust due to tectonic processes.
Uplift Force X104. Project Cargo Forwarders and Heavy Transport: Vertical force applied to a load by slings during a lift, opposing gravity.
Uplink X68. Maritime Satcom and Telecommunications: Direction of transmission from the vessel terminal to the satellite.
Uplink Power Control X68. Maritime Satcom and Telecommunications: Adaptive technique that increases vessel transmit power during rain fade.
Upper Bay X124. Dredging Industry and Reclamation Contractors: New York Harbor area dredged for 50 ft programme.
Upper bearing X19. Engine Room Watchkeeping and UMS Operations: Top half of main bearing in some engine designs.
Upper bearing (turbocharger) B2. Marine Engineering: Bearing on the compressor side.
Upper Berth X164. Cruise Industry, Brands, Ship Classes, and Terminals: A third or fourth bunk in a stateroom typically used by children, excluded from the lower berth capacity quoted in cruise ship specifications.
Upper bevel (Z-drive) X38. Propellers, Stern Gear and Shaft Lines: Upper bevel gear set in a Z-drive azimuth thruster, in the steering tube above the slewing bearing.
Upper deck X3. Ship Handling, Seamanship and Deck Vocabulary: Highest continuous deck.
Upper deck block X58. Shipbuilding Yards and Construction: Block forming the uppermost continuous deck and adjacent shell.
Upper Deck Cutting Sequence X50. Ship Recycling, Demolition and Hong Kong Convention: The standard sequencing for removing upper deck plating and superstructure during dismantling.
Upper Deck Plating X54. Naval Architecture Software and IACS Rules: Strength deck plating subject to longitudinal bending stresses per IACS UR S11.
Upper deck stringer B1. Naval Architecture: Strake at the gunwale connection.
Upper limb X16. Nautical Science, Navigation and COLREGs: Upper edge of the Sun or Moon as observed in a sextant.
Upper Marine Riser Package X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Subsea wellhead riser interface containing flex joint and slip joint above the lower marine riser package.
Upper Mark F4. Recreational Boating, Yachting and Sport: Windward turning mark in a race course.
Upper Mississippi X33. Inland Navigation and Barge Operations: Mississippi River above Cairo with 29 locks and dams operated by USACE.
Upper Mississippi River X103. US Inland Waterway Towing and Barge: The Mississippi River above the confluence with the Ohio at Cairo, extending to Minneapolis-St. Paul through a system of 29 locks and dams.
Upper Ocean Heat Content (0-300 m) D5. Coastal processes, sea-level, cryosphere and ocean observation science: Heat content of the upper 300 meters of the ocean.
Upper Permian Zechstein X57. Ocean Energy Beyond Wind: Geological formation in the southern North Sea that includes potential seals for CO2 storage complexes.
Upper Promenade X64. Cruise Industry Operators, Brands and Ships: Traditional Holland America Line deck designation.
Upper Spreader X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Topmost spreader on a pilot ladder, required to be a minimum 1.8 meters long under ISO 799-1.
Upper Stack (LMRP) X14. Offshore Oil and Gas Marine Operations: Top half of BOP with annulars; disconnectable.
Upper Tier X9. Cargo Securing, Lashing and Stability Vocabulary: Container tier above first.
Upper Tier Establishment X75. IMDG Code, Classes, Packing and Segregation: Seveso term not used in IMDG; included to avoid confusion with port establishments handling dangerous goods.
Upper Yard Sailor F1. Maritime History: Historic able seaman skilled at working highest yards.
UPS X67. Marine Electrical Systems and Shore Power: Uninterruptible power supply providing battery-backed power to navigation, communication, and automation systems.
Upstream sediment transport X57. Ocean Energy Beyond Wind: Process altered by tidal range schemes that affects estuarine morphology.
Upstream Vessel F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Vessel proceeding against the current.
UPT United Petroleum Trading X72. Bunkering Hubs and Bunker Suppliers: Bunker trader inside Bunker Holding focusing on Latin America and the US Gulf.
Uptake (ballast) X18. Ballast Water, Biofouling and Antifouling: Intake of ballast water through sea chest and ballast pumps.
Uptime X59. Offshore Wind O&M, CTVs and SOVs: Norwegian supplier of motion compensated gangways and offshore access equipment for SOVs and CSOVs.
Uptime gangway X59. Offshore Wind O&M, CTVs and SOVs: Motion compensated walkway product family from Uptime used on Bibby WaveMaster and other SOVs.
Uptime International X105. Offshore Wind Farm Installation and Vessels: Norwegian motion-compensated gangway manufacturer supplying SOV and CSOV access systems.
Uptower X42. Offshore Wind Installation and Cable Lay: Located inside the nacelle, as opposed to downtower at the tower base.
Upwelling B3. Nautical Science: Coastal current rising cold water, relevant in weather routing.
Upwelling Index D1. Physical and chemical oceanography and marine meteorology: Bakun and related indices quantifying coastal upwelling intensity.
Upwind X84. Yacht Racing, Regattas and Sailing Governance: The direction from which the wind is blowing, opposite of downwind.
Upwind Leg F4. Recreational Boating, Yachting and Sport: Beat to windward in a race course.
UR A1 X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on equipment for anchoring, mooring, and towing.
UR S1A X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on bulk carrier loading sequence and conditions.
UR W13 X92. Marine Steel Suppliers and Shipbuilding Plate: IACS Unified Requirement for thickness tolerances of steel plates and wide flats.
UR-E X8. IACS, Class Rules and Class Notations: IACS UR series covering electrical and automation requirements.
UR-E22 X8. IACS, Class Rules and Class Notations: IACS UR on the onboard use of computer based systems.
UR-E22, UR-E26, UR-E27 X25. Maritime Cybersecurity, OT and IT: See IACS entries.
UR-E26 X8. IACS, Class Rules and Class Notations: IACS UR on Cyber Resilience of Ships, in force for vessels contracted on or after 1 July 2024.
UR-E27 X8. IACS, Class Rules and Class Notations: IACS UR on Cyber Resilience of On-board Systems and Equipment, in force from 1 July 2024.
UR-I X8. IACS, Class Rules and Class Notations: IACS UR series for Polar Class, defining PC1 through PC7.
UR-I1 X8. IACS, Class Rules and Class Notations: IACS UR defining Polar Class descriptions.
UR-I2 X8. IACS, Class Rules and Class Notations: IACS UR on Polar Class structural requirements.
UR-I3 X8. IACS, Class Rules and Class Notations: IACS UR on Polar Class machinery requirements.
UR-M X8. IACS, Class Rules and Class Notations: IACS UR series on machinery.
UR-M53 X8. IACS, Class Rules and Class Notations: IACS UR on calculation of crankshafts for I.C. engines.
UR-M68 X8. IACS, Class Rules and Class Notations: IACS UR on dimensions of propulsion shafts.
UR-S X8. IACS, Class Rules and Class Notations: IACS UR series on strength of ships.
UR-S1 X8. IACS, Class Rules and Class Notations: IACS UR on longitudinal strength of ships carrying liquids in bulk, applied to oil tankers.
UR-S11 X8. IACS, Class Rules and Class Notations: IACS UR on longitudinal strength standard, defining minimum section modulus and bending moments.
UR-S11A X8. IACS, Class Rules and Class Notations: IACS UR on longitudinal strength standard for container ships under CSR-aligned methodology.
UR-S17 X8. IACS, Class Rules and Class Notations: IACS UR on evaluation of allowable hold loading on bulk carriers with one hold flooded (rules for existing ships).
UR-S18 X8. IACS, Class Rules and Class Notations: IACS UR on the evaluation of scantlings of corrugated transverse watertight bulkheads in bulk carriers considering hold flooding.
UR-S19 X8. IACS, Class Rules and Class Notations: IACS UR on evaluation of scantlings of the transverse watertight corrugated bulkhead between cargo holds Nos.1 and 2 with cargo hold No.1 flooded for existing bulk carriers.
UR-S20 X8. IACS, Class Rules and Class Notations: IACS UR on evaluation of allowable hold loading on bulk carriers considering hold flooding (existing ships).
UR-S21 X8. IACS, Class Rules and Class Notations: IACS UR on evaluation of scantlings of hatch covers and coamings of cargo holds of bulk carriers.
UR-S22 X8. IACS, Class Rules and Class Notations: IACS UR on evaluation of allowable hold loading of cargo holds of bulk carriers considering hold flooding.
UR-S25 X8. IACS, Class Rules and Class Notations: IACS UR on longitudinal strength standard for general dry cargo ships.
UR-S6 X8. IACS, Class Rules and Class Notations: IACS UR on use of steel grades for various hull members.
UR-W X8. IACS, Class Rules and Class Notations: IACS UR series on materials and welding.
UR-W11 X8. IACS, Class Rules and Class Notations: IACS UR on normal and higher strength hull structural steels.
UR-W14 X8. IACS, Class Rules and Class Notations: IACS UR on steel forgings.
UR-W17 X8. IACS, Class Rules and Class Notations: IACS UR on approval of consumables for welding.
UR-Z X8. IACS, Class Rules and Class Notations: IACS UR series on survey and certification.
UR-Z10.1 X8. IACS, Class Rules and Class Notations: IACS UR on hull surveys of oil tankers, the foundation of tanker ESP.
UR-Z10.2 X8. IACS, Class Rules and Class Notations: IACS UR on hull surveys of bulk carriers, the foundation of bulk carrier ESP.
UR-Z10.5 X8. IACS, Class Rules and Class Notations: IACS UR on hull surveys of double hull oil tankers.
URAG X79. Tugs and Towage Industry: Unterweser Reederei AG, German towage company headquartered in Bremen.
Ural X133. Polar Research Vessels and Polar Code Regimes: Third Project 22220 icebreaker commissioned November 2022 by Baltic Shipyard.
Ural, Project 22220 X52. Polar Code, Arctic and Antarctic Shipping: Third Project 22220 LK-60Ya nuclear icebreaker, commissioned on 22 November 2022.
Uranium Hexafluoride X75. IMDG Code, Classes, Packing and Segregation: UN 2977 fissile excepted or UN 2978 Class 7 with Class 8 subsidiary risk.
Uranium Metal Pyrophoric X75. IMDG Code, Classes, Packing and Segregation: UN 2979, Class 7 with Class 4.2 subsidiary risk.
Urban Runoff D3. Marine environmental science, pollution and conservation: Stormwater carrying urban pollutants to coastal waters.
UrbanCable Initiative X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: City-led cable resilience project examples relevant to nearshore MSP.
URC 522 C3. Logistics, freight forwarding and multimodal trade: ICC Uniform Rules for Collections.
URC-1 X122. Submarine Cable Laying, Repair Vessels and Operators: ASN repeater housing type, the first generation Universal Repeater Case, with internal modular optical units.
URC-2 X122. Submarine Cable Laying, Repair Vessels and Operators: ASN second-generation repeater housing supporting larger fiber pair counts for SDM systems.
URC-3 X122. Submarine Cable Laying, Repair Vessels and Operators: ASN repeater housing for high-fiber-pair-count systems including Dunant and 2Africa.
Urchin barren X10. Marine Biology, Fisheries and Oceanography: Subtidal area denuded of macroalgae by intense sea urchin grazing.
URDG 758 C3. Logistics, freight forwarding and multimodal trade: ICC Uniform Rules for Demand Guarantees.
Urea Heating X69. EGCS Scrubbers, SCR and Marine Air Emissions: Trace heating maintaining urea solution above its crystallization point.
Urea Hydrogen Peroxide X75. IMDG Code, Classes, Packing and Segregation: UN 1511, Class 5.1 oxidizer with Class 8 subsidiary risk.
Urea Quality X69. EGCS Scrubbers, SCR and Marine Air Emissions: Reductant must meet ISO 22241 or equivalent for SCR durability.
Urea Solution (AUS 40) D6. Decarbonization, emissions and alternative fuels: Reductant used in SCR systems on marine engines.
Urea Storage Tank X69. EGCS Scrubbers, SCR and Marine Air Emissions: Stainless steel or coated tank carrying AUS32 or AUS40.
Urea storage tank (SCR retrofit) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: New tank for SCR installation.
Urea tank X19. Engine Room Watchkeeping and UMS Operations: Storage for SCR reagent under IMO MEPC.291(71) guidelines.
Urea, Bulk X1. Cargo Science, Commodities and Cargo Care: Major nitrogen fertilizer; Group C IMSBC; caking risk.
Urgency signal (PAN PAN) X16. Nautical Science, Navigation and COLREGs: Voice signal preceding an urgent message.
Urgency Surcharge X86. Port Agency, Husbandry and Disbursement: Surcharge applied for services requested on an urgent or out-of-hours basis.
Urgent Medical Care at Sea F3. Seafaring Life, Education, Professions and Institutions: Telemedical Maritime Assistance Service (TMAS) network.
Urho X52. Polar Code, Arctic and Antarctic Shipping: Finnish state icebreaker built in 1975, lead of the Urho class.
Uria X10. Marine Biology, Fisheries and Oceanography: Genus of guillemots (*Uria aalge*, *Uria lomvia*), common North Atlantic and Pacific seabirds.
Urinalysis dipstick X36. Shipboard Medical, Telemedicine and Seafarer Health: Multi-parameter urine test strip in IMGS Annex V.
URS X79. Tugs and Towage Industry: Union de Remolcadores Sud, Spanish towage cooperative operating in Andalusian ports.
URS11 X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on longitudinal strength of ships.
URS11A X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on longitudinal strength of container ships.
URS33 X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on design wave loads for direct strength analysis of oil tankers.
URS34 X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on functional requirements on load cases for direct strength analysis of oil tankers.
URS6 X54. Naval Architecture Software and IACS Rules: IACS Unified Requirement on the use of steel grades for various hull members.
Uruguay PSC X66. Port State Control and Regional MOUs: Acuerdo de Vina del Mar member State.
US 105/155/255 thruster (Rolls-Royce/Kongsberg) X38. Propellers, Stern Gear and Shaft Lines: US-series azimuth thrusters with power codes (e.g., US 305 at higher ratings) for OSVs and tugs.
US 144A Bond X49. Ship Finance, Leasing and Maritime Capital Markets: Restricted US bond placed to qualified institutional buyers under SEC Rule 144A.
US 205 FP X137. Harbour Tugs, Towage Operators and Tug Builders: Rolls-Royce/Kongsberg azimuth thruster, often paired in 60 to 80 t BP ASD tugs.
US 305 FP X137. Harbour Tugs, Towage Operators and Tug Builders: Higher rated Rolls-Royce/Kongsberg thruster for large escort tugs.
US American Fisheries Act (1998) X87. Fishing Vessels and Fisheries Management: US law restructuring the Bering Sea pollock fishery into shoreside, mothership, and catcher processor sectors with cooperatives.
US Army Corps of Engineers (USACE) X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The federal agency operating, maintaining, and constructing locks, dams, and dredged channels on the US inland waterway system.
US Cable Landing License Act (1921) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Federal statute requiring presidential authorization for landing foreign submarine cables on US shores.
US Caribbean ECA X69. EGCS Scrubbers, SCR and Marine Air Emissions: SOx and NOx Emission Control Area covering waters around Puerto Rico and the US Virgin Islands.
US Caribbean ECA-NOx X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The Tier III NOx Emission Control Area around Puerto Rico and the US Virgin Islands, applicable to ships constructed on or after 1 January 2016.
US Caribbean ECA-SOx X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The Emission Control Area for sulphur oxides around Puerto Rico and the US Virgin Islands, in effect from 1 January 2014.
US Coast Guard X98. Ship Registries and Flag States: US armed service and flag administration responsible for documentation, inspection, and certification of US-flag vessels.
US Coast Guard Captain of the Port X60. Marine Salvage and Wreck Removal: US authority empowered to direct salvage and pollution response operations in US waters.
US Coast Guard Fishing Vessel Safety Examination X87. Fishing Vessels and Fisheries Management: Voluntary or mandatory inspection program for US commercial fishing vessels under 46 CFR Part 28.
US Coast Guard Form CG-719K X36. Shipboard Medical, Telemedicine and Seafarer Health: Medical Certificate for merchant mariners issued through the National Maritime Center.
US Coast Guard Liaison X86. Port Agency, Husbandry and Disbursement: Liaison with the US Coast Guard for vessel calls at US ports.
US Coast Guard National Vessel Documentation Center X49. Ship Finance, Leasing and Maritime Capital Markets: US authority maintaining the federal vessel registry where preferred mortgages are recorded.
US Coast Guard Sector E1. Maritime security, geopolitics and risk: Geographic command for port-security and SAR functions.
US Coast Guard State of the Coast Guard Address X119. Maritime Conferences, Trade Shows and Awards: Annual policy address by the Commandant.
US Customs and Border Protection (CBP) E1. Maritime security, geopolitics and risk: Trade and security agency administering CSI/AMS.
US Documentation X98. Ship Registries and Flag States: Federal recordation of US-flag vessels by the NVDC under 46 USC Chapter 121.
US Environmental Protection Agency (EPA) X18. Ballast Water, Biofouling and Antifouling: Co-regulator with USCG under VIDA for incidental discharges.
US EPA PCB rules X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: National regulations on PCB management that affect US-flagged ship recycling decisions, often via the MARAD recycling program.
US Ex-Im X49. Ship Finance, Leasing and Maritime Capital Markets: Common abbreviation for the Export Import Bank of the United States.
US Gulf Bunker Range X72. Bunkering Hubs and Bunker Suppliers: Bunker supply region covering Houston, Galena Park, Channelview, Texas City, New Orleans, Mobile, and Tampa.
US Inland Waterways System X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The 12,000 mi commercial system administered by USACE, comprising the Mississippi, its tributaries, the GIWW, and the AIWW.
US Maritime Administration C1. Commercial shipping, chartering, economics and finance: MARAD, US government maritime authority.
US Maritime Administration Annual MARAD Conference X119. Maritime Conferences, Trade Shows and Awards: Annual Washington DC event.
US Maritime Spatial Plan Framework X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: National Ocean Policy and Regional Ocean Partnerships guiding US ocean planning, including subsea cable and pipeline siting.
US National Standard 1 (NS1) X87. Fishing Vessels and Fisheries Management: Magnuson-Stevens Act standard requiring fishery management plans to prevent overfishing while achieving optimum yield.
US National Strike Force X60. Marine Salvage and Wreck Removal: USCG specialized pollution response force with command, control, and equipment resources.
US Naval Institute Press F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Publisher of maritime history works.
US Navy Diving Manual X82. Saturation Diving and Offshore Diving Operations: Reference document containing standard dive procedures and tables.
US Navy Table 4 X82. Saturation Diving and Offshore Diving Operations: Recompression table for severe DCS, now largely superseded by Table 6A.
US Navy Table 5 X82. Saturation Diving and Offshore Diving Operations: Recompression table for Type 1 DCS relieved within 10 minutes at 60 fsw.
US Navy Table 6 X82. Saturation Diving and Offshore Diving Operations: Primary recompression table for serious DCS on oxygen at 60 fsw.
US Navy Table 6A X82. Saturation Diving and Offshore Diving Operations: Recompression table for arterial gas embolism with descent to 165 fsw.
US Navy Table 7 X82. Saturation Diving and Offshore Diving Operations: Saturation recompression table for life-threatening symptoms.
US Navy Table 9 X82. Saturation Diving and Offshore Diving Operations: Recompression table for residual symptoms after primary treatment.
US Sailing X84. Yacht Racing, Regattas and Sailing Governance: The national governing body for sailing in the United States.
US Steel X92. Marine Steel Suppliers and Shipbuilding Plate: United States Steel Corporation, integrated US steelmaker operating Gary Works, Mon Valley Works, and Granite City Works.
US VGP (Vessel General Permit) X18. Ballast Water, Biofouling and Antifouling: 2013 EPA permit for incidental discharges; superseded by VIDA standards being developed.
US Wind X42. Offshore Wind Installation and Cable Lay: US offshore wind developer with the MarWin and Momentum Wind projects off Maryland.
US-CERT TA17-181A X139. Maritime Cybersecurity, OT Threats and Standards: Technical alert on Petya ransomware variant published 28 June 2017.
USACE X33. Inland Navigation and Barge Operations: United States Army Corps of Engineers, responsible for federal navigation channels and locks.
USACE Engineer Manual EM 1110-2-1100 X124. Dredging Industry and Reclamation Contractors: Coastal Engineering Manual, the bible for shoreline protection works.
USACE Engineer Manual EM 1110-2-5025 X124. Dredging Industry and Reclamation Contractors: Dredging and Dredged Material Management manual.
USACE Engineer Manual EM 1110-2-5026 X124. Dredging Industry and Reclamation Contractors: Beneficial Uses of Dredged Material manual.
USACE Surveys D2. Hydrography, tides, waves, bathymetry and marine geology: US Army Corps of Engineers hydrographic surveys, especially in inland waters.
Usage Band X73. Marine Hydrography, Charting and ENC: The S-57 numeric category (1-6) representing the scale and intended navigational use of an ENC cell.
USAP X133. Polar Research Vessels and Polar Code Regimes: United States Antarctic Program operated by the National Science Foundation since 1959.
USAR X80. Maritime Search and Rescue Coordination: Urban Search and Rescue, distinct from maritime SAR.
USB Control X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: A policy controlling removable media use on bridge and engine workstations, frequently breached and a known infection vector.
USB Control Policy X25. Maritime Cybersecurity, OT and IT: Policy and technology limiting use of removable media on bridge and engine room computers.
USB Device Attack X107. Maritime Cybersecurity and OT Security: Compromise vector in which malicious code is delivered through removable media, central to the Stuxnet case.