Glossary

Maritime glossary, terms beginning with O (page 3)

All maritime glossary terms that begin with the letter O, drawn from every subject section. 1233 entries.

Showing 250 of 1233 terms (page 3 of 5).

Olympic class X85. Ferries, Ro-Pax Operators and Routes: Washington State Ferries class comprising Tokitae, Samish, Chimacum, and Suquamish.
Olympic Classes X84. Yacht Racing, Regattas and Sailing Governance: The boats selected by World Sailing for each edition of the Olympic Games.
Olympic Fishery X87. Fishing Vessels and Fisheries Management: Race for fish under an aggregate TAC without individual allocation, largely replaced by IFQ systems.
Olympic Park X124. Dredging Industry and Reclamation Contractors: London 2012 venue, built partly on dredged-and-treated land.
Olympic Sailing F4. Recreational Boating, Yachting and Sport: Sailing has been part of the Olympic program since 1900.
Olympic Shipping X59. Offshore Wind O&M, CTVs and SOVs: Norwegian shipowner operating SOVs and offshore support tonnage chartered to wind clients.
Olympic+ 86950 X165. Marine Coatings, Antifouling, and Hull Husbandry: Hempel chemically polishing antifouling product line for general-purpose merchant ship hulls.
Olympus Field Pipeline X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Subsea oil pipeline serving the Olympus TLP in the Gulf of Mexico.
OMA Algeria X86. Port Agency, Husbandry and Disbursement: Algerian agency representing principals at national ports.
Oman Area (Annex I) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: A proposed sub-area; current Annex I Special Areas list places Oman waters within the Gulfs Area where applicable.
Oman LNG X134. LNG and LPG Carrier Operators and Containment Systems: Omani LNG exporter chartering fleet of around 12 LNG carriers from various owners including Nakilat and Awilco.
Oman Maritime College X121. Maritime Education, Academies and Universities: International Maritime College Oman, IMCO in Sohar, founded 2005 in partnership with STC Group Netherlands.
Oman PSC X66. Port State Control and Regional MOUs: Riyadh MOU member; hosts the Secretariat in Muscat.
Ombuds Function (Onboard) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: De-facto role often played by chaplains and welfare visitors during port calls.
OMC International X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Australian provider of the DUKC dynamic under-keel clearance system widely used by pilots in iron-ore ports.
OMC Med Energy Conference X119. Maritime Conferences, Trade Shows and Awards: Biennial Ravenna Mediterranean offshore oil and gas event since 1993.
Omega X122. Submarine Cable Laying, Repair Vessels and Operators: Subcom field joint kit reference name used in repair manuals.
OMEGA Engineering X96. Hull Integrity Monitoring and Strain Gauges: American instrumentation supplier offering strain gauges, load cells, and signal conditioning.
Omega Protein X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: Houston-based menhaden processor, the largest US reduction fishery operator.
Omega seal X42. Offshore Wind Installation and Cable Lay: Reference cable sealing component name.
OmniAccess X68. Maritime Satcom and Telecommunications: Maritime VSAT and IT services provider acquired by Inmarsat in 2017 and focused on yacht and cruise customers.
Omnibus Clause X53. Marine Insurance, P&I and Hull Clauses: A clause extending cover to liabilities of a class not specifically enumerated, common in P&I rules through directors' discretion.
Omsterdam Bunker Operations X72. Bunkering Hubs and Bunker Suppliers: Combined coordination of bunker barges between Amsterdam and Rotterdam for ARA stems.
OMZ X10. Marine Biology, Fisheries and Oceanography: Oxygen Minimum Zone, a midwater layer of very low dissolved oxygen.
On Board Armoury X22. Piracy, Maritime Security and Armed Protection: Locked, restricted access compartment for PCASP weapons and ammunition during a transit.
On Deck Only X75. IMDG Code, Classes, Packing and Segregation: Stowage requirement for certain Class 5.2 organic peroxides and Class 1 substances per column 16a entries.
On Subjects X29. Ship Sale and Purchase, Management Contracts and Valuation: Fixture conditional on stated subjects being lifted.
On the bow X3. Ship Handling, Seamanship and Deck Vocabulary: Bearing forward of the beam.
On the quarter X3. Ship Handling, Seamanship and Deck Vocabulary: Bearing abaft the beam.
On the wind X3. Ship Handling, Seamanship and Deck Vocabulary: Sailing close-hauled.
On-board pilot X32. Marine Pilotage and Pilot Operations: Pilot status while embarked and acting as advisor.
On-carriage X6. Container, Intermodal and Trade Codes: Inland transport leg after main sea carriage.
On-Charter Survey X43. Marine Surveying and Warranty Surveying: See on-hire survey, the inspection at delivery into a time charter.
On-deck lashing X76. Stevedoring, Lashing and Cargo Securing: Securing arrangement applied to deck stacks using rods, turnbuckles, and twistlocks.
On-deck stack X76. Stevedoring, Lashing and Cargo Securing: Container column carried above the weather deck and hatch covers.
On-Hire X83. ISO Container Manufacturing and Leasing: Release of a container from depot to a lessee under a lease contract.
On-Hire Bunker Survey X43. Marine Surveying and Warranty Surveying: A specific quantity and quality determination of bunkers at the moment of delivery into a time charter, separating it from the broader on-hire survey.
On-Hire Condition Survey X155. Marine Surveying Practice and Cargo Inspection: An inspection at delivery establishing the baseline condition of the vessel for redelivery comparison.
On-Hire Survey X5. Marine Surveying and Inspection: Joint survey at delivery into time charter recording condition and bunkers.
On-line viscometer X47. Marine Fuel Quality and ISO 8217: Continuous viscosity sensor mounted in the engine fuel supply controlling viscotherm fuel heater output.
On-load release mechanism X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Lifeboat release equipment subject to MSC.320(89) operational testing and MSC.317(89) design requirements following the 2014 amendments.
On-Potential X100. Marine Cathodic Protection and Anodes: A potential reading taken with CP current flowing, which includes IR drop in the electrolyte.
Onassis Era F1. Maritime History: Mid-twentieth century rise of Greek tanker tycoons.
Onboard X46. Container Terminal Operations: A vessel stowage and loading computer software brand used on container ships.
Onboard Carbon Capture D6. Decarbonization, emissions and alternative fuels: CO2 capture from ship engine exhausts.
Onboard Complaint Procedure X154. Maritime Welfare, Seafarer Charities, and MLC Rights: See MLC Regulation 5.1.5.
Onboard Compute Cluster X109. Maritime Autonomous Surface Ships and MASS Code: The set of servers and embedded computers that host the MASS autonomy and bridge applications.
Onboard Data Server (ISO 19847) E3. Technology, digitalization and smart shipping: Standardized sensor-data hub.
Onboard DC Grid X67. Marine Electrical Systems and Shore Power: Architecture from ABB and others that distributes power as DC instead of three-phase AC.
Onboard Familiarization Tour X86. Port Agency, Husbandry and Disbursement: Familiarization tour for new crew, coordinated with security.
Onboard Lashing X104. Project Cargo Forwarders and Heavy Transport: Securing of project cargo to a vessel using chains, wires, and turnbuckles.
Onboard Manifest Briefing X86. Port Agency, Husbandry and Disbursement: Briefing on cargo manifest details given to terminal and authorities.
Onboard Network X68. Maritime Satcom and Telecommunications: Vessel local area network connecting bridge, engine room, and crew areas to the satellite gateway.
Onboard Operational Limitations Information A2. Maritime safety legislation: SOLAS and its codes: Required under SOLAS II-1/8-1.
Onboard Processing X87. Fishing Vessels and Fisheries Management: Cleaning, filleting, freezing, or surimi production on factory trawlers and motherships.
Onboard Quantity Report X115. Marine Bunker and Cargo Surveying: Pre-loading document recording all residual liquid and sediment in cargo tanks, used in cargo reconciliation.
Onboard sampling point X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Approved location on the receiving line for collecting MARPOL samples.
Onboard Sulfur Compliance Verification X69. EGCS Scrubbers, SCR and Marine Air Emissions: Testing of in-use samples for fuel sulfur content.
Onboard training programme C2. Ship operations, crewing and technical management: Cadet and officer training plan.
Onboard training record book X21. STCW Certificates, Crewing and Seafarer Welfare: TRB, STCW Section A-II/1 and A-III/1 document for structured cadet training.
Onboard Visual Check X28. Ship Recycling and End-of-Life: IHM development step examining the ship physically before sampling.
Ondansetron X36. Shipboard Medical, Telemedicine and Seafarer Health: 5HT3 antagonist antiemetic available in oral and injectable forms.
Ondernemingsraad MSP X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Dutch MSP advisory committee for North Sea spatial planning.
Onderzoeksraad voor Veiligheid (OVV) X163. Marine Accident Investigation Agencies and Landmark Inquiries: See Dutch Safety Board.
ONE X6. Container, Intermodal and Trade Codes: Ocean Network Express, Japanese container line.
ONE Apus X76. Stevedoring, Lashing and Cargo Securing: Containership that lost a large number of containers in the North Pacific in November 2020, with reported losses around 1,816 boxes.
One Design Class F4. Recreational Boating, Yachting and Sport: Class governed by tight construction tolerances.
One Hundred Year Storm X60. Marine Salvage and Wreck Removal: Statistical benchmark sometimes used in salvage weather window planning.
One Long Blast F5. The Reference Layer: Glossary, Units, Signals and Information Sources: COLREGs sound signal indicating approach to a blind bend.
One Maritime Center X42. Offshore Wind Installation and Cable Lay: Reference port building.
One Ocean Expeditions X97. Polar Expedition Cruise and IAATO Operations: Canadian expedition operator that ceased trading in 2019 after losing its Akademik Ioffe and Akademik Sergey Vavilov charters.
One off survey X19. Engine Room Watchkeeping and UMS Operations: Special class survey conducted for major repairs or after incidents.
One Sea X109. Maritime Autonomous Surface Ships and MASS Code: The digital autonomous shipping ecosystem hosted by DIMECC in Finland with members including ABB, Wartsila, Tieto, Cargotec, Inmarsat, Ericsson, and Kongsberg.
One Step at a Time X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Boarding discipline taught to pilots to advance only one step at a climb before bringing the trailing foot up to the same step.
One Way Data Diode X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: A hardware device permitting data flow in only one direction, used between OT and IT zones on advanced builds.
One-Design X84. Yacht Racing, Regattas and Sailing Governance: A class in which all boats are built to identical specifications, so racing is decided by sailing skill.
One-man bridge operation (OMBO) B3. Nautical Science: DNV class notation requiring redundancy.
One-meter trim moment B1. Naval Architecture: Numerical synonym for MCT.
One-off X125. Superyacht Industry, Builders and Brokers: Synonym for full custom yacht.
One-Over-Two X46. Container Terminal Operations: A stacking crane configuration able to pick a container from the top of a two-high stack without intermediate moves, used with reach stackers and yard cranes.
One-pack coating X45. Marine Paints, Coatings and Antifouling: Single-component coating that cures by solvent evaporation or atmospheric moisture, in contrast to two-pack.
One-side welding (FCB) B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Flux-copper backing single-sided welding.
One-sided welding X58. Shipbuilding Yards and Construction: Welding from one side of the joint using ceramic backing or copper shoes.
One-stop window X15. Ports, Terminals and Stevedoring: see single window.
One-Trip Container X83. ISO Container Manufacturing and Leasing: Container that has made one laden trip from plant and is then sold as nearly new.
One-Way Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Disposable lashing such as steel strapping.
One-Way Latency X68. Maritime Satcom and Telecommunications: Time required for a signal to travel from sender to receiver across the satellite link.
One-way traffic X32. Marine Pilotage and Pilot Operations: Traffic regime where pilotage authority permits only inbound or outbound vessels in a constrained channel.
One2three Naval Architects X132. High-Speed Craft, Hydrofoils and Ferry Operators: Sydney-based HSC design house responsible for many Austal and other catamaran designs.
Onedin Line X39. Pre-1900 Maritime History: Fictional Liverpool shipping firm; included historically as the program drew on the genuine Allan, Inman, and Bibby lines; omit.
Onego Shipping X81. Project Cargo, Heavy-Lift and Module Carriers: Rotterdam-based operator of semi-bulk and project carriers.
OneNet Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Internal regional cable upgrade project name.
OneOcean Group X73. Marine Hydrography, Charting and ENC: The corporate group formed from ChartCo and Tototheo's digital fleet management businesses.
OneOcean Platform X78. Voyage Optimization and Vessel Performance Software: The Lloyd's Register branded suite of navigation, environmental, and compliance applications for fleet operators.
OneStop Renewable Energy X123. Offshore Wind Installation Vessels and Operators: Brand of Saipem for renewables EPCI offerings, includes floating wind and substation work.
OneTerminal X78. Voyage Optimization and Vessel Performance Software: A maritime technology offering associated with terminal operations and integration with vessel and port systems.
OneWeb X68. Maritime Satcom and Telecommunications: Low Earth orbit Ku-band constellation operated by Eutelsat OneWeb, with maritime offerings in development.
OneWeb Maritime E3. Technology, digitalization and smart shipping: LEO satellite broadband service.
Onex Elefsis Shipyard X113. Drydock and Ship Repair Yards: Greek ship repair yard at Elefsis under Onex Shipyards & Technologies ownership.
ONGC Vetting X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: India's Oil and Natural Gas Corporation vetting function for tankers serving its offshore terminals and FSO operations.
Onload tap changer X19. Engine Room Watchkeeping and UMS Operations: HV transformer tap selection without de-energizing, rare on ships.
Onnettomuustutkintakeskus (OTKES) X163. Marine Accident Investigation Agencies and Landmark Inquiries: See Finnish Safety Investigation Authority.
Onomichi Dockyard X58. Shipbuilding Yards and Construction: Japanese shipbuilder at Onomichi, Hiroshima, building bulkers and tankers.
Onshore Complaint Procedure X154. Maritime Welfare, Seafarer Charities, and MLC Rights: See MLC Regulation 5.2.2.
Onshore Power Supply X67. Marine Electrical Systems and Shore Power: European term for shore power equivalent to AMP and cold ironing.
Onshore Power Supply (OPS) D6. Decarbonization, emissions and alternative fuels: Electrical supply to ships at berth, also called cold ironing.
Onshore Risk X53. Marine Insurance, P&I and Hull Clauses: Risks of damage to cargo or property while ashore, relevant to the duration of cargo cover.
Onshore Salvage Claims X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Salvage P&I cover element provided under IG club Rules.
Onshore substation X42. Offshore Wind Installation and Cable Lay: Electrical facility converting export cable voltage to transmission level and providing reactive compensation.
Onyx Hopper X124. Dredging Industry and Reclamation Contractors: NMDC TSHD.
OOCL X6. Container, Intermodal and Trade Codes: Orient Overseas Container Line, COSCO Shipping Group brand.
OOCL Long Beach X138. Global Container Terminal Operators and Port Equipment: Long Beach Container Terminal Pier T leased by Orient Overseas Container Line, world's first semi-automated US container facility.
OOCL Reefer X136. Reefer Vessels and Cool Chain Operators: Orient Overseas Container Line reefer container business with around 100,000 reefer TEU, integrated into COSCO Shipping after the 2018 acquisition.
OOG X6. Container, Intermodal and Trade Codes: Out of Gauge, cargo exceeding internal container dimensions, typically on flatrack or open top.
OOG (Out Of Gauge) X1. Cargo Science, Commodities and Cargo Care: Container cargo exceeding ISO envelope; needs special stowage.
OOG Cargo X104. Project Cargo Forwarders and Heavy Transport: Out of gauge cargo exceeding standard container or trailer dimensions.
OOI D2. Hydrography, tides, waves, bathymetry and marine geology: Ocean Observatories Initiative providing cabled and mooring observatories.
OOS Gretha X81. Project Cargo, Heavy-Lift and Module Carriers: OOS International accommodation and heavy-lift semi-submersible.
OOS International X81. Project Cargo, Heavy-Lift and Module Carriers: Netherlands-based offshore operator running large semi-submersible accommodation and crane vessels.
OOS Tiradentes X81. Project Cargo, Heavy-Lift and Module Carriers: OOS International accommodation and heavy-lift semi-submersible.
Oosterdam X64. Cruise Industry Operators, Brands and Ships: Holland America Line Vista-class ship delivered in 2003.
Oosterschelde X128. Sail Training Ships and Tall Ship Associations: Dutch three masted topsail schooner built 1918 at Zwartewaal, 50 m length, last surviving large Dutch sailing freighter, operates global sail training and Darwin200 expedition.
OOW X21. STCW Certificates, Crewing and Seafarer Welfare: Officer of the Watch, the navigational or engineering watchkeeping officer.
OOW (Officer of the Watch) X16. Nautical Science, Navigation and COLREGs: Officer in charge of the navigational watch.
OOW Near-Coastal Under 500 GT X160. Maritime Academies, Universities, and STCW Certification: STCW A-II/3 certificate of competency for navigational watch on near-coastal ships less than 500 GT.
OOW Simulator Assessment X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment: Officer of the Watch competence assessment under STCW Code A-II/1.
OOW Watch X80. Maritime Search and Rescue Coordination: Officer of the Watch maintaining GMDSS watch on the bridge.
OOW Yachts <3000 GT X35. Yacht and Superyacht Industry: MCA Officer of the Watch certificate for yachts up to 3,000 GT.
OOW Yachts less than 3000 GT X156. Superyacht Industry, Builders, and Yacht Charter Market: MCA Yacht Officer of the Watch Certificate of Competency for service as deck OOW on commercial yachts under 3,000 GT.
OPA 90 C1. Commercial shipping, chartering, economics and finance: Oil Pollution Act 1990, US oil pollution liability statute.
OPA 90 Arctic provisions X27. Polar Code, Ice Navigation and Polar Operations: US Oil Pollution Act 1990 Section 7301 covers Trans-Alaska Pipeline System.
OPA 90 Clause X17. Chartering, Shipbroking and Freight Trading: Addresses US Oil Pollution Act of 1990 liabilities under tanker charters.
OPA 90 Compliance Records, Recycling X50. Ship Recycling, Demolition and Hong Kong Convention: Historical OPA 90 records referenced for legacy tanker recycling due diligence.
OPA-90 Salvage and Marine Firefighting Rule X141. Marine Salvage Industry and Wreck Removal Contractors: 33 CFR 155 Subpart I requiring pre-arranged SMFF coverage for tankers and non-tankers in US waters.
OPC UA E3. Technology, digitalization and smart shipping: Industrial interoperability standard used in shipboard automation.
OPCC (Operational Performance Carbon Capture) D6. Decarbonization, emissions and alternative fuels: Operational on-board CCS performance.
OPDR (Oldenburg-Portugiesische Dampfschiffs-Rhederei) X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The historic Hamburg-based short sea container line, acquired by CMA CGM in 2014 and rebranded MacAndrews-OPDR before consolidation under CMA CGM Shortsea.
Open 60 X84. Yacht Racing, Regattas and Sailing Governance: An informal name for the IMOCA 60 Open class.
Open Access Fishery D4. Fisheries, aquaculture, blue economy and marine resources: Fishery without restricted entry.
Open Bell X82. Saturation Diving and Offshore Diving Operations: Wet bell without pressurized envelope, used as a stage for surface-supplied divers.
Open Bridge X89. ECDIS and Bridge Equipment Makers: Kongsberg led design philosophy promoting consistent operator interfaces across bridge equipment.
Open Bridge Standard X109. Maritime Autonomous Surface Ships and MASS Code: An industry initiative for harmonized bridge user interfaces relevant when designing remote operations workstations.
Open caisson X175. Port Engineering, Dredging, Breakwaters, and Quays: Caisson open at top and bottom, sunk through soft soils by excavation from within, used for deep foundations.
Open Chock X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Chock that does not enclose the rope opening, simpler than a closed chock but unsuited to high snatch loads.
Open Circuit X82. Saturation Diving and Offshore Diving Operations: Breathing system venting exhaled gas to ambient water.
Open Container X9. Cargo Securing, Lashing and Stability Vocabulary: Container without full top or sides, requiring tarpaulin and additional securing.
Open Cooling System X63. Marine Auxiliary Machinery and Pumps: Direct seawater cooling arrangement with seawater passing through the cooler tubes.
Open Cover X4. Marine Insurance, P&I and Claims: contract under which underwriters agree to accept all cargo shipments meeting agreed criteria during a stated period.
Open drift ice X27. Polar Code, Ice Navigation and Polar Operations: Floating ice concentration 4/10 to 6/10 with many leads.
Open ECDIS Forum X73. Marine Hydrography, Charting and ENC: An online practitioner forum (now defunct) for ECDIS users and providers.
Open Form X141. Marine Salvage Industry and Wreck Removal Contractors: Generic term for LOF, distinct from lump-sum Wreckfixed.
Open Form Salvage X99. Marine Salvage Awards and SCOPIC: Salvage performed under an open form contract such as the LOF rather than a bespoke contract.
Open Gauging X115. Marine Bunker and Cargo Surveying: Tank measurement through an open dipping hatch, allowing vapor release and requiring gas-safety precautions.
Open Hatch Bulker X1. Cargo Science, Commodities and Cargo Care: Box-shaped hold designed for forest products.
Open Hatch Inspection X5. Marine Surveying and Inspection: Inspection inside holds with hatches open after cleaning.
Open Hatch Vessel X81. Project Cargo, Heavy-Lift and Module Carriers: Vessel design with hatchways the full width of the hold for vertical access to cargo, used for forest products and some project loads.
Open hawse X3. Ship Handling, Seamanship and Deck Vocabulary: Both anchor cables leading straight from their hawse pipes.
Open Hopper Barge X103. US Inland Waterway Towing and Barge: A hopper barge without covers, used for weather-tolerant cargo such as coal and aggregates.
Open Interest X44. Shipping Indices, FFAs and Freight Markets: Total number of FFA contracts outstanding at a clearing house, used as a gauge of market participation.
Open jetty C4. Ports, terminals and coastal/marine civil engineering: Jetty allowing wave transmission below.
Open Loop / Closed Loop / Combined Cycle Vaporizer X20. LNG Operations and Custody Transfer: FSRU regasification modes using seawater alone, glycol-water with gas heat, or both.
Open loop scrubber X19. Engine Room Watchkeeping and UMS Operations: Exhaust gas cleaning system using once through sea water under MEPC.340(77).
Open Market Slip X4. Marine Insurance, P&I and Claims: placing slip used in the London market for non-binder business.
Open Navigation Surface X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Industry-led format effort that produced the BAG file structure, now stewarded by the OpenNavigationSurface working group.
Open Observation X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A SIRE observation for which operator response has not yet been accepted as adequate.
Open ocean trial X58. Shipbuilding Yards and Construction: Sea trial conducted in open water testing speed, maneuvering, and propulsion performance.
Open order X3. Ship Handling, Seamanship and Deck Vocabulary: Wide spacing in formation.
Open pack ice X27. Polar Code, Ice Navigation and Polar Operations: Synonym for open drift ice in WMO terminology.
Open Phase Protection X67. Marine Electrical Systems and Shore Power: Relay that detects loss of one phase on a three-phase marine motor circuit.
Open piled jetty X175. Port Engineering, Dredging, Breakwaters, and Quays: Marine berthing structure consisting of a piled trestle and deck rather than a continuous wall, used in deep water and soft soils.
Open Polynya D5. Coastal processes, sea-level, cryosphere and ocean observation science: Polynya kept open by ocean heat flux from below.
Open Polytechnic of New Zealand Maritime X121. Maritime Education, Academies and Universities: Distance learning provider for New Zealand maritime certificates.
Open position X71. Shipbrokers and Brokerage Firms: Vessel circulated by brokers as available for employment with stated open date and port.
Open Position List X161. Shipbroking, Freight Derivatives, and Baltic Indices: Broker circular of vessels open for employment in given areas during specified dates.
Open registry C1. Commercial shipping, chartering, economics and finance: Flag state with open access to foreign owners.
Open Registry Vessel X98. Ship Registries and Flag States: Vessel registered with an open registry such as Panama, Liberia, or the Marshall Islands.
Open Sampling X115. Marine Bunker and Cargo Surveying: Sample drawing technique through an open ullage hatch using a portable bottle or zone sampler.
Open sea X16. Nautical Science, Navigation and COLREGs: Area of sea beyond inshore traffic zones and TSSs.
Open Sea Operating Manual (OSOM) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Pipelay vessel operating manual covering S-lay configuration parameters and contingency plans.
Open Slip X53. Marine Insurance, P&I and Hull Clauses: The slip in the course of placement, before signing-down and final binding.
Open Source Intelligence (OSINT) X139. Maritime Cybersecurity, OT Threats and Standards: Use of publicly available information for reconnaissance, including AIS, port schedules, and crew rosters.
Open Source Reporting X22. Piracy, Maritime Security and Armed Protection: Use of public AIS, news and satellite imagery to monitor suspect vessels.
Open top X6. Container, Intermodal and Trade Codes: Container with removable tarpaulin roof, ISO type suffix UT.
Open Top Barge X103. US Inland Waterway Towing and Barge: A general term for any barge without permanent covers over the cargo hold.
Open top container C3. Logistics, freight forwarding and multimodal trade: Container with removable tarpaulin roof.
Open water X27. Polar Code, Ice Navigation and Polar Operations: Sea area where ice concentration is less than 1/10.
Open water test X38. Propellers, Stern Gear and Shaft Lines: Towing-tank test of a propeller in uniform inflow, generating the open-water diagram.
Open-Circuit Potential X100. Marine Cathodic Protection and Anodes: The rest potential of an anode or structure when no current is flowing in the external circuit.
Open-cycle OTEC X57. Ocean Energy Beyond Wind: OTEC configuration that flashes warm seawater into low-pressure steam to drive a turbine and can co-produce desalinated water.
Open-loop Ban X69. EGCS Scrubbers, SCR and Marine Air Emissions: Local prohibition on open-loop scrubber discharge in certain ports and coastal waters.
Open-storage yard X15. Ports, Terminals and Stevedoring: paved area for cargoes not requiring shelter.
Open-Top Container ship B5. Ship Types and Individual Vessels: Cellular ship without hatch covers.
Open-water diagram B1. Naval Architecture: KT, KQ, eta_O versus J for a propeller in open water.
Open-water efficiency etaO X162. Naval Architecture, Stability, Resistance, and Structural Design: Efficiency of the isolated propeller eta0 equals (J times KT) divided by (2 pi times KQ).
OpenAMIP X68. Maritime Satcom and Telecommunications: Open antenna-modem interface protocol used in some VSAT installations.
OpenCPN X73. Marine Hydrography, Charting and ENC: An open-source chart plotting software supporting unencrypted ENC display.
OpenFOAM X54. Naval Architecture Software and IACS Rules: Open-source CFD toolbox developed by OpenCFD Ltd and distributed by the OpenFOAM Foundation and ESI.
OpenFOAM interFoam X54. Naval Architecture Software and IACS Rules: Volume-of-fluid solver in OpenFOAM widely used for ship resistance and seakeeping.
OpenHydro X57. Ocean Energy Beyond Wind: Irish tidal stream developer that built ducted turbines and entered insolvency in 2018 when parent Naval Energies closed it down.
Opening of Hatches Notice X86. Port Agency, Husbandry and Disbursement: Notice that cargo hatches will be opened, requiring safety clearance.
Opening submissions X152. Maritime Arbitration and Dispute Resolution: Initial advocacy at hearing summarizing each side's case.
Opening Ullage X155. Marine Surveying Practice and Cargo Inspection: The ullage measurement taken just before cargo transfer begins, used with the closing ullage to derive the transferred quantity.
OpenPort X68. Maritime Satcom and Telecommunications: See Iridium OpenPort.
OPENS-100 Forum X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Industry forum promoting interoperability of S-100 product specifications.
OpenSeaMap X73. Marine Hydrography, Charting and ENC: A community-driven nautical chart layer derived from OpenStreetMap data.
OpenShip X54. Naval Architecture Software and IACS Rules: Bentley Systems integrated ship design environment building on MicroStation.
Operability envelope B1. Naval Architecture: Sea-state limits for mission performance.
Operating compressor hours X26. Reefer Containers and Cold Chain Logistics: Cumulative compressor runtime recorded by reefer controller.
Operating console X19. Engine Room Watchkeeping and UMS Operations: ECR workstation with mimic, alarm list, and manual control buttons.
Operating expenses C1. Commercial shipping, chartering, economics and finance: OPEX, daily costs of running the ship excluding voyage and capital costs.
Operating Lease X49. Ship Finance, Leasing and Maritime Capital Markets: Lease that does not transfer substantially all risks and rewards of ownership.
Operating port X15. Ports, Terminals and Stevedoring: governance model where port authority operates terminals (e.g., Singapore historically).
Operating Pressure X88. Marine Surface Preparation and Coatings Application: Air pressure at the blast nozzle inlet, typically specified at 100 psi to maintain productivity, measured by needle gauge inserted through the hose wall.
Operating Window X69. EGCS Scrubbers, SCR and Marine Air Emissions: Range of engine load and ambient conditions within which an EGCS or SCR is certified.
Operation Agenor X22. Piracy, Maritime Security and Armed Protection: European Maritime Awareness in the Strait of Hormuz military arm, launched 2020.
Operation Allied Protector X127. Maritime Security, Anti-Piracy and PMSCs: NATO counter-piracy operation March to August 2009, predecessor to Ocean Shield.
Operation and maintenance base X42. Offshore Wind Installation and Cable Lay: Shoreside facility supporting offshore wind operations including jetty, warehouse, and control room.
Operation Aspides E1. Maritime security, geopolitics and risk: 2024 EU defensive Red Sea mission.
Operation Atalanta E1. Maritime security, geopolitics and risk: EUNAVFOR mission off Somalia (since 2008).
Operation Drake (1978 to 1980) X128. Sail Training Ships and Tall Ship Associations: UK round the world youth expedition aboard the brigantine Eye of the Wind, precursor to Operation Raleigh and a milestone in STI affiliated youth sail training.
Operation EUNAVFOR Med X127. Maritime Security, Anti-Piracy and PMSCs: Mediterranean operations distinct from Atalanta; included IRINI for Libya arms embargo.
Operation Junction Rain X127. Maritime Security, Anti-Piracy and PMSCs: Periodic exercise in West Africa under SHADE-GoG model.
Operation Ocean Shield E1. Maritime security, geopolitics and risk: NATO counter-piracy mission (2009 to 2016).
Operation Prosperity Guardian E1. Maritime security, geopolitics and risk: 2023 to 2024 US-led Red Sea defensive coalition.
Operation Raleigh (1984 onward) X128. Sail Training Ships and Tall Ship Associations: Follow on to Operation Drake, with the schooner Sir Walter Raleigh as flagship; later replaced by inland and overseas Raleigh International programs.
Operation Sea Guardian X127. Maritime Security, Anti-Piracy and PMSCs: NATO Mediterranean maritime security operation launched 9 November 2016, successor to Active Endeavour.
Operation Sentinel X127. Maritime Security, Anti-Piracy and PMSCs: US-led International Maritime Security Construct in the Strait of Hormuz, launched 7 November 2019.
Operational area C4. Ports, terminals and coastal/marine civil engineering: Area planned for terminal handling operations.
Operational assessment (POLARIS) X27. Polar Code, Ice Navigation and Polar Operations: Calculation of risk index outcome RIO for a planned route.
Operational Capability Vessel (OCV) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Class of survey ships emphasizing mission flexibility through containerized payloads and modular sensor frames.
Operational compliance X149. Marine Fuels, Bunkering, and Alternative Fuels: Demonstrated compliance with MARPOL Annex VI through onboard records (BDN, MARPOL samples, ECA logs) during PSC inspections.
Operational Compliance Certificate X98. Ship Registries and Flag States: Generic term for statutory operational certificates issued by flag administrations or recognized organizations.
Operational Control X66. Port State Control and Regional MOUs: PSC authority to verify operational requirements such as drills and watchkeeping.
Operational Daily Report X86. Port Agency, Husbandry and Disbursement: Daily operational report sent to the principal by the agent.
Operational Design Domain X109. Maritime Autonomous Surface Ships and MASS Code: The defined conditions in which a MASS is permitted to operate including weather, traffic, and geography.
Operational Discard Plan X87. Fishing Vessels and Fisheries Management: EU plan under Article 15 of the Common Fisheries Policy specifying species and exemptions under the landing obligation.
Operational Drills A2. Maritime safety legislation: SOLAS and its codes: Required under SOLAS III/19.
Operational Efficiency D6. Decarbonization, emissions and alternative fuels: Operational measures such as slow steaming improving energy use.
Operational evidence X163. Marine Accident Investigation Agencies and Landmark Inquiries: Material such as VDR data, ECDIS logs, AIS records, ENC update history, and engine room data loggers gathered during safety investigations.
Operational Filling Limit X20. LNG Operations and Custody Transfer: 98.5 percent on most LNG tanks at minus 163 degrees C reference per IGC.
Operational Hazardous Waste X28. Ship Recycling and End-of-Life: IHM Part II category covering oily wastes, sludges, and chemicals.
Operational Item X41. Cruise Ship Public Health and VSP/USPH: Day-to-day practice element of the VSP inspection, distinguished from physical construction items.
Operational level X21. STCW Certificates, Crewing and Seafarer Welfare: STCW certification level corresponding to OOW responsibilities.
Operational Limit X79. Tugs and Towage Industry: Class-defined sea state or wind range within which a tug is permitted to perform escort or salvage operations.
Operational Limitations X8. IACS, Class Rules and Class Notations: restrictions on service area, draft or speed recorded in the class certificate.
Operational limitations (passenger ship) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Listed on Passenger Ship Safety Certificate per SOLAS V/30.2 (MSC.99(73)).
Operational Limits X132. High-Speed Craft, Hydrofoils and Ferry Operators: HSC Code mandates a Permit to Operate that specifies wave height, wind, visibility and distance from refuge.
Operational Loading Information X96. Hull Integrity Monitoring and Strain Gauges: Onboard documentation required under IACS UR S35 describing loading and stress assessment for container ships.
Operational manual sounding X47. Marine Fuel Quality and ISO 8217: Daily ullage check used to track ROB and verify consumption against engine room logs.
Operational oceanography X10. Marine Biology, Fisheries and Oceanography: Sustained provision of routine ocean data, forecasts, and services.