Glossary

Maritime glossary, terms beginning with U (page 5)

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

Showing 137 of 1137 terms (page 5 of 5).

USB Drop Attack X25. Maritime Cybersecurity, OT and IT: Leaving infected USB drives in public areas to be inserted by unwitting users.
USB Hygiene X139. Maritime Cybersecurity, OT Threats and Standards: Procedures controlling removable media use aboard ship, the most common bridge-system malware vector per Naval Dome 2019 study.
USB Sanitization Kiosk X48. Maritime Cybersecurity: Standalone device used to scan removable media before connection to shipboard systems.
USBL X65. ROVs, AUVs, USVs and Marine Robotics: Ultra-short baseline acoustic positioning that uses a single transducer head with multiple elements to derive bearing and range to a transponder.
USBL (Ultra Short Baseline) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Acoustic positioning method that locates a transponder relative to a transducer array on the survey vessel, exemplified by Kongsberg HiPAP and Sonardyne Ranger.
USCG A7. Compliance, certification and enforcement: United States Coast Guard, US flag and PSC authority.
USCG (United States Coast Guard) X35. Yacht and Superyacht Industry: US maritime regulator with rules for yachts under the US flag.
USCG (US Coast Guard) X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The US maritime regulator, source of NVICs 01-20, 09-02 Ch.6, 02-24, and CG-FAC and CG-CVC cyber guidance.
USCG Atlantic Strike Team X141. Marine Salvage Industry and Wreck Removal Contractors: Fort Dix-based federal response unit interfacing with salvors.
USCG ATON Survey X129. Hydrographic Offices, Survey Vessels and Marine Cartography: US Coast Guard surveys of aids to navigation positions, fed back to NOAA for chart compilation.
USCG biofouling rules X165. Marine Coatings, Antifouling, and Hull Husbandry: US Coast Guard ballast water and biofouling management requirements under 33 CFR Part 151.
USCG Cyber Strategic Outlook X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The 2021 USCG strategy document elevating cyber to a core operational mission.
USCG District 1 X130. National Coast Guards and Cutter Fleets: Boston, Massachusetts, covering New England.
USCG District 11 X130. National Coast Guards and Cutter Fleets: Alameda, California, covering California, Arizona, Nevada and Utah.
USCG District 13 X130. National Coast Guards and Cutter Fleets: Seattle, Washington, covering Pacific Northwest.
USCG District 14 X130. National Coast Guards and Cutter Fleets: Honolulu, Hawaii, covering Pacific Islands.
USCG District 17 X130. National Coast Guards and Cutter Fleets: Juneau, Alaska, covering Alaska region.
USCG District 5 X130. National Coast Guards and Cutter Fleets: Portsmouth, Virginia, covering Mid-Atlantic.
USCG District 7 X130. National Coast Guards and Cutter Fleets: Miami, Florida, covering Florida, Georgia, South Carolina, Puerto Rico and USVI.
USCG District 8 X130. National Coast Guards and Cutter Fleets: New Orleans, Louisiana, covering Gulf Coast and inland rivers.
USCG District 9 X130. National Coast Guards and Cutter Fleets: Cleveland, Ohio, covering Great Lakes.
USCG District Eight X80. Maritime Search and Rescue Coordination: USCG district covering the Gulf of Mexico and inland rivers.
USCG District Eleven X80. Maritime Search and Rescue Coordination: USCG district covering California and the eastern Pacific.
USCG District Five X80. Maritime Search and Rescue Coordination: USCG district covering the mid-Atlantic seaboard.
USCG District Fourteen X80. Maritime Search and Rescue Coordination: USCG district covering Hawaii and the central Pacific.
USCG District Nine X80. Maritime Search and Rescue Coordination: USCG district covering the Great Lakes.
USCG District One X80. Maritime Search and Rescue Coordination: USCG district covering New England waters.
USCG District Seventeen X80. Maritime Search and Rescue Coordination: USCG district covering Alaska and the Arctic.
USCG District Thirteen X80. Maritime Search and Rescue Coordination: USCG district covering the Pacific Northwest.
USCG E-Zero Award X66. Port State Control and Regional MOUs: USCG award recognizing foreign-flag vessels with zero environmental deficiencies over consecutive examinations under the QUALSHIP 21 program.
USCG ECA enforcement X116. Global Bunker Anchorages, Hubs and Supply Infrastructure: United States Coast Guard verification of compliant fuel use within the North American ECA per 33 CFR Part 151.
USCG Federal On Scene Coordinator X167. Major Salvage Companies, Wreck Removals, and Equipment: US Coast Guard role directing federal response to maritime pollution and salvage incidents.
USCG Federal Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: US Coast Guard licensed pilot operating in waters not subject to state pilotage commissions, primarily on the Great Lakes.
USCG Federal Pilot endorsement X32. Marine Pilotage and Pilot Operations: Endorsement on USCG license enabling pilotage of US-flag vessels in coastwise trade.
USCG Final Rule on Cybersecurity in the Marine Transportation System X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: 33 CFR Part 101 amendments published 17 January 2025 (effective 16 July 2025) setting minimum cyber requirements for US-flag vessels and MTSA facilities.
USCG Foreign Operations Notice of Suspension X66. Port State Control and Regional MOUs: Action suspending a foreign-flag vessel's operations in US waters.
USCG Formal Investigation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Mid-tier USCG investigation procedure used for serious casualties not warranting a Marine Board.
USCG Healy X52. Polar Code, Arctic and Antarctic Shipping: See Healy.
USCG Informal Investigation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Lower-tier USCG investigation conducted by an investigating officer at the unit level for routine casualties.
USCG LOI X56. LNG/LPG Carriers and IGC Code: US Coast Guard Letter of Intent required for foreign LNG carriers calling at US LNG terminals.
USCG Marine Board of Investigation X12. Maritime Casualties and Investigation: Highest tier of US Coast Guard casualty inquiry under 46 CFR Part 4.
USCG Marine Information for Safety and Law Enforcement (MISLE) X146. Port State Control Regimes, MoUs, and Inspection Systems: The US Coast Guard database of vessel inspections and incidents.
USCG Marine Safety Information Bulletin X48. Maritime Cybersecurity: Periodic bulletin used by the US Coast Guard to communicate cyber risk advisories to industry.
USCG Marine Safety Manual X98. Ship Registries and Flag States: Multi-volume guidance issued by the US Coast Guard on inspection and certification of US-flag vessels.
USCG Maritime Cyber Readiness Branch X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: The USCG unit issuing cyber bulletins and supporting MTSA facilities.
USCG Merchant Mariner Credential F3. Seafaring Life, Education, Professions and Institutions: US national seafarer license.
USCG MSIB 04-23 X25. Maritime Cybersecurity, OT and IT: 2023 Marine Safety Information Bulletin reinforcing cyber expectations for vessels and facilities.
USCG NAIS X74. AIS Data, Vessel Tracking and Maritime Intelligence: United States Coast Guard Nationwide Automatic Identification System.
USCG NavCen X74. AIS Data, Vessel Tracking and Maritime Intelligence: US Coast Guard Navigation Center maintaining national AIS and LRIT guidance.
USCG NVIC 01-20 X48. Maritime Cybersecurity: US Coast Guard Navigation and Vessel Inspection Circular 01-20, Guidelines for Addressing Cyber Risks at Maritime Transportation Security Act Regulated Facilities.
USCG NVIC 02-22 X48. Maritime Cybersecurity: US Coast Guard Navigation and Vessel Inspection Circular 02-22, Vessel Cyber Risk Management Work Instruction.
USCG Port State Control X7. Flag State, Port State Control and Detention Vocabulary: PSC programme of the United States Coast Guard, applying the QUALSHIP 21 incentive scheme and TVEL targeting matrix.
USCG Port State Information Exchange (PSIX) X146. Port State Control Regimes, MoUs, and Inspection Systems: The publicly accessible US database of foreign-flag inspections and detentions.
USCG QualShip 21 X66. Port State Control and Regional MOUs: USCG program recognizing high-performing foreign-flag vessels and providing reduced examinations.
USCG Recreational Boating Safety F4. Recreational Boating, Yachting and Sport: National safety program.
USCG Subchapter D X93. IBC Code and Chemical Tanker Operations: US Coast Guard regulations at 46 CFR Subchapter D governing tank vessels including chemical tankers.
USCG Targeting Matrix X66. Port State Control and Regional MOUs: Risk-based matrix used by USCG to prioritize foreign-flag inspections.
USCG WAGB X133. Polar Research Vessels and Polar Code Regimes: US Coast Guard Heavy Icebreaker hull classification symbol, applied to Polar Star and Healy.
USCG WAGB-10 X133. Polar Research Vessels and Polar Code Regimes: USCGC Polar Star, heavy icebreaker.
USCG WAGB-20 X133. Polar Research Vessels and Polar Code Regimes: USCGC Healy, medium icebreaker.
USCGC X130. National Coast Guards and Cutter Fleets: United States Coast Guard Cutter prefix.
USDA X103. US Inland Waterway Towing and Barge: US Department of Agriculture, whose Federal Grain Inspection Service grades and weighs grain barge cargoes.
USDA APHIS PPQ Treatment Manual X26. Reefer Containers and Cold Chain Logistics: Definitive guide for approved phytosanitary treatments including cold treatment regimes.
USDA APHIS Treatment Manual X136. Reefer Vessels and Cool Chain Operators: Authoritative manual prescribing cold treatment regimes for reefer container imports of fruit fly host commodities into the United States.
USDA Choice X120. Marine Catering, Provisions and Ship Chandlers: Beef grading reference commonly required in chandler RFQs as the minimum quality threshold.
USDA cold treatment X70. Reefer Containers and Cold Chain Shipping: United States Department of Agriculture phytosanitary regime requiring specified low temperatures to be held for defined periods during transit.
USDA cold treatment schedules X26. Reefer Containers and Cold Chain Logistics: 14 days at 0 C, 16 days at 0.55 C, 18 days at 1.11 C, 20 days at 1.39 C, 22 days at 1.67 C for Mediterranean, oriental, and Caribbean fruit flies (T107-a).
USDA Grade A Eggs X120. Marine Catering, Provisions and Ship Chandlers: Quality grade specified in provisioning contracts for US sourced supply.
USDA Prime X120. Marine Catering, Provisions and Ship Chandlers: Highest beef grade, restricted to officer-mess specification on cruise and luxury yacht categories.
USDA SET X26. Reefer Containers and Cold Chain Logistics: Sea-borne in-transit cold treatment program.
Use of Force Continuum E2. Naval, defence and maritime law enforcement: Graduated steps from hail/warning to disabling fire.
Used Bunker Certificate F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Bunker delivery note (BDN) under MARPOL Annex VI.
Used Laytime X17. Chartering, Shipbroking and Freight Trading: Time actually expended in loading or discharging that counts as laytime.
Used Lubricant Oil ULO X28. Ship Recycling and End-of-Life: Recovered lubricant categorized as waste and managed under MARPOL Annex I.
Used lubricating oil (ULO) X47. Marine Fuel Quality and ISO 8217: Spent crankcase oil, prohibited as a bunker blendstock by ISO 8217 due to metals and combustion behavior.
Used Oil A3. Marine environmental legislation: MARPOL and its annexes: Treated under MARPOL Annex I oil definition.
Used oil analysis X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Periodic testing of system, cylinder, and TPEO lubricants to monitor wear and contamination.
Used Oil Disposal Plan X50. Ship Recycling, Demolition and Hong Kong Convention: The yard procedure for managing waste lubricating oils generated during dismantling.
Useful life X45. Marine Paints, Coatings and Antifouling: PSPC target of 15 years during which coating system is intended to remain in GOOD condition.
Useful Result X60. Marine Salvage and Wreck Removal: Outcome required under Article 12 of the 1989 Convention before a salvage reward becomes payable.
User Awareness Training X48. Maritime Cybersecurity: Recurring education program to improve crew and shore staff recognition of phishing and other social engineering.
User Behavior Analytics X48. Maritime Cybersecurity: Detection technique that learns normal patterns of user activity to surface anomalies.
User Permit X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Unique alphanumeric string identifying an ECDIS in the IHO S-63 chart-protection scheme.
User Terminal X68. Maritime Satcom and Telecommunications: General term for the satellite equipment installed on the vessel.
USFOS Stability Modeling X60. Marine Salvage and Wreck Removal: Software used in marine and offshore stability analysis.
USHA Martin X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Indian manufacturer of steel wire ropes and synthetic ropes, including mooring and offshore products.
Ushakov Maritime State University X121. Maritime Education, Academies and Universities: See Admiral Ushakov Maritime State University.
Ushuaia X27. Polar Code, Ice Navigation and Polar Operations: Argentine port; principal gateway for Antarctic Peninsula expedition cruising.
USL and H X117. Marine Insurance Markets, Captives and Reinsurance: United States Longshore and Harbor Workers' Compensation Act, requiring specialized US marine workers' compensation cover.
USMCA X6. Container, Intermodal and Trade Codes: United States-Mexico-Canada Agreement, replacement for NAFTA.
USMCC X80. Maritime Search and Rescue Coordination: United States Mission Control Centre for Cospas-Sarsat at NOAA Suitland.
USMMA X21. STCW Certificates, Crewing and Seafarer Welfare: United States Merchant Marine Academy.
USNI Defense Forum Washington X119. Maritime Conferences, Trade Shows and Awards: Annual naval defense conference held at the US Navy Memorial.
USPHS X41. Cruise Ship Public Health and VSP/USPH: United States Public Health Service, parent uniformed service whose officers historically conducted ship sanitation inspections.
USPHS Hose X41. Cruise Ship Public Health and VSP/USPH: Dedicated potable water hose meeting USPHS specifications with capped fittings stored to prevent contamination.
USPHS Sanitation Inspection of International Vessels X41. Cruise Ship Public Health and VSP/USPH: Original program from which the modern CDC Vessel Sanitation Program is descended.
USPHS Stamp X41. Cruise Ship Public Health and VSP/USPH: Inspection sticker historically placed on equipment indicating verified compliance, retained in modern VSP form.
USPHS Vessel Sanitation Program (VSP) X36. Shipboard Medical, Telemedicine and Seafarer Health: US Public Health Service inspections of cruise ships calling at US ports.
USPPI X6. Container, Intermodal and Trade Codes: United States Principal Party in Interest, AES filer designation.
USS Connecticut (SSN-22) X91. Submarines and Submarine Cable Systems: US Navy Seawolf-class fast attack submarine.
USS Constellation (FFG-62) X62. Naval Warships and Combat Systems: Lead ship of the Constellation-class guided-missile frigate program for the US Navy.
USS Constitution F1. Maritime History: 1797 American heavy frigate preserved at Boston.
USS Constitution Museum F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Boston museum adjacent to Old Ironsides.
USS District of Columbia (SSBN-826) X91. Submarines and Submarine Cable Systems: Lead boat of the US Navy Columbia-class ballistic missile submarines.
USS Jimmy Carter (SSN-23) X91. Submarines and Submarine Cable Systems: US Navy Seawolf-class fast attack submarine with hull plug for special mission systems.
USS Joint Venture X132. High-Speed Craft, Hydrofoils and Ferry Operators: HSV-X1, Incat 96 m wave-piercer operated 2001 to 2008 by the US Navy and Army, later sold to Isle of Man Steam Packet as Manannan.
USS Monitor F1. Maritime History: 1862 Union ironclad of the Battle of Hampton Roads.
USS Seawolf (SSN-21) X91. Submarines and Submarine Cable Systems: Lead boat of the US Navy Seawolf-class fast attack submarines.
USS Virginia (SSN-774) X91. Submarines and Submarine Cable Systems: Lead boat of the US Navy Virginia-class fast attack submarines.
Usufruct X125. Superyacht Industry, Builders and Brokers: Civil law ownership structure occasionally used to hold yachts in continental Europe.
USV X65. ROVs, AUVs, USVs and Marine Robotics: Unmanned surface vessel, a self-propelled surface platform operated remotely or autonomously without crew on board.
UT X6. Container, Intermodal and Trade Codes: ISO 6346 size-type suffix indicating open-top container.
UT (Inmarsat) X68. Maritime Satcom and Telecommunications: User Terminal in Inmarsat documentation.
UT Survey X100. Marine Cathodic Protection and Anodes: A thickness-measurement campaign using ultrasonic gauges to track corrosion of hull plating and internal members.
UTC X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Coordinated Universal Time; AIS timestamps are referenced to UTC seconds.
UTC (Coordinated Universal Time) X16. Nautical Science, Navigation and COLREGs: International time scale used in navigation and GNSS.
UTC Timestamp X80. Maritime Search and Rescue Coordination: Universal Coordinated Time used to record all SAR events.
UTI Tape X155. Marine Surveying Practice and Cargo Inspection: The Ullage, Temperature, and Interface tape used in petroleum measurement, capable of detecting the oil-water interface using a probe and water-finding paste.
Utilisation C1. Commercial shipping, chartering, economics and finance: Percentage of available ship time earning revenue.
Utility of Boats Exhibitions F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Heritage of working craft displays.
Utility Vessel X14. Offshore Oil and Gas Marine Operations: Small offshore work boat.
Utilization Factor X100. Marine Cathodic Protection and Anodes: The fraction of anode mass actually delivered as charge before the anode is considered consumed.
UTM X113. Drydock and Ship Repair Yards: Ultrasonic thickness measurement of hull and tank steel performed during drydock as part of class renewal surveys.
Utmost Despatch X17. Chartering, Shipbroking and Freight Trading: Owner's obligation to perform the voyage with reasonable speed.
Utmost Good Faith X53. Marine Insurance, P&I and Hull Clauses: See Uberrimae Fidei.
Utmost Good Faith (Uberrimae Fidei) X143. Landmark Maritime Law Cases and Doctrines: Marine insurance doctrine in section 17 UK Marine Insurance Act 1906.
Utopia of the Seas X164. Cruise Industry, Brands, Ship Classes, and Terminals: The sixth Oasis class Royal Caribbean ship, delivered in 2024 by Chantiers de l'Atlantique, dedicated to short Bahamas cruises from Port Canaveral.
Utrecht Treaty 1713 F1. Maritime History: Settlement awarding Britain the Asiento slave-trade contract.
Utsira Formation X57. Ocean Energy Beyond Wind: Sandstone aquifer in the Norwegian North Sea used for CO2 storage at Sleipner since 1996.
Utsira Nord X42. Offshore Wind Installation and Cable Lay: Norwegian floating offshore wind area awarded for development planning.
Uudenkaupungin Museo F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Finnish coastal town museum with maritime collections.
UV Sterilizer X63. Marine Auxiliary Machinery and Pumps: Ultraviolet disinfection device used on potable water and STP effluent.
UV transmittance (UVT) X18. Ballast Water, Biofouling and Antifouling: Optical clarity parameter that determines UV BWMS dose effectiveness.
UVP X11. Naval Vessels, Warship Systems and Naval Architecture: Russian Universal Vertical Launcher, used on Admiral Gorshkov class.
UWILD X113. Drydock and Ship Repair Yards: Underwater Inspection in Lieu of Drydock class notation permitting alternate in-water surveys for eligible vessels.
UWTROC X73. Marine Hydrography, Charting and ENC: ENC object class for underwater rocks and obstructions, with depth attributes.
Uzmar X30. Tug Operations and Harbour Towage: Turkish shipyard building tugs to its own and licensed designs.