Glossary

Maritime glossary, terms beginning with O

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

Showing 250 of 1233 terms (page 1 of 5).

O'Donovan, Patrick X99. Marine Salvage Awards and SCOPIC: Member of the Lloyd's Salvage Arbitrators panel.
O&M agreement X59. Offshore Wind O&M, CTVs and SOVs: Contract under which a service provider delivers operations and maintenance services to the wind farm owner.
O&M base X59. Offshore Wind O&M, CTVs and SOVs: Onshore facility comprising offices, warehousing, and quayside infrastructure supporting offshore wind operations.
O&M port X59. Offshore Wind O&M, CTVs and SOVs: Harbor designated as the operating base for a wind farm's CTV and SOV fleet and shore personnel.
O1 X16. Nautical Science, Navigation and COLREGs: Principal lunar diurnal tidal constituent, period 25.82 h.
O2 (Orbital Marine Power) X57. Ocean Energy Beyond Wind: 2 MW floating tidal turbine deployed in the Fall of Warness, Orkney, by Orbital Marine Power.
O2 Analyzer X93. IBC Code and Chemical Tanker Operations: Instrument continuously measuring oxygen concentration in inert gas and tank atmospheres aboard tankers.
O2 setpoint X26. Reefer Containers and Cold Chain Logistics: Target oxygen concentration in CA reefer, typically 1 to 5% by volume for apple and avocado.
O3b X68. Maritime Satcom and Telecommunications: SES medium Earth orbit Ka-band constellation used in some maritime mobility services.
Oakland Port X138. Global Container Terminal Operators and Port Equipment: Northern California gateway operating OICT, Ben E. Nutter Terminal and SSA Marine facilities, 2.3 million TEU handled in 2023.
Oakum X3. Ship Handling, Seamanship and Deck Vocabulary: Loose fiber obtained by untwisting old rope, used in caulking.
OALC X122. Submarine Cable Laying, Repair Vessels and Operators: Optical Aerial Lightweight Cable, not submarine, mentioned here only to distinguish from OALC-4 and OALC-7 submarine families produced by ASN.
OALC-4 X122. Submarine Cable Laying, Repair Vessels and Operators: ASN single-armor submarine cable design for fiber counts up to 16 pairs.
OALC-7 X122. Submarine Cable Laying, Repair Vessels and Operators: ASN deepwater LW cable design supporting up to 24 fiber pairs for SDM systems including Dunant and 2Africa.
Oar X3. Ship Handling, Seamanship and Deck Vocabulary: Pole with a flattened blade used to propel a boat.
Oar-and-Sail Ship F1. Maritime History: Common Mediterranean classical antiquity hybrid configuration.
Oar-Powered Heritage Vessels F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Surviving examples of mediaeval Mediterranean galleys.
Oared Galleass F1. Maritime History: Hybrid type used by Venice in the sixteenth century.
Oarlock X3. Ship Handling, Seamanship and Deck Vocabulary: U-shaped device holding an oar; rowlock.
Oars X39. Pre-1900 Maritime History: Wooden levers used to propel small craft and historically large galleys.
OAS X73. Marine Hydrography, Charting and ENC: Operational Area for Survey, used in survey planning documents.
OAS Datum X80. Maritime Search and Rescue Coordination: Datum assumption used for objects without sea anchor.
OASIS X77. Naval Mine Warfare and Mine Countermeasures: The Organic Airborne Surface Influence Sweep, an LCS MCM payload concept superseded by the Textron UISS.
Oasis class X24. Cruise, Passenger Ship and Ferry Operations: Royal Caribbean class introduced 2009, lead ship 226,838 GT.
Oasis of the Seas X24. Cruise, Passenger Ship and Ferry Operations: Lead ship of the Oasis class, delivered 2009.
Oasis tools X42. Offshore Wind Installation and Cable Lay: Reference subsea pull-in tool series; included for context.
OAT X31. Helicopter Operations on Ships: Outside Air Temperature, primary input to density altitude and performance calculations.
Oath X152. Maritime Arbitration and Dispute Resolution: Solemn religious affirmation of truth, available alongside non-religious affirmation for witnesses giving oral evidence.
Oatmeal (Provisions) X120. Marine Catering, Provisions and Ship Chandlers: IMPA 550706 rolled oats, 1 kg pack, breakfast staple.
OBA X19. Engine Room Watchkeeping and UMS Operations: Oil based analysis program for engine oils, run quarterly on most ships.
Oban Sails X128. Sail Training Ships and Tall Ship Associations: Scottish small craft sail training organization affiliated with national STI member RYA Sail Training; runs Argyll based youth voyages.
OBC X126. Marine Oil Spill Response and OPRC Regimes: Oiled Beach Cleaner, common Cedre acronym for the SURF RAKE.
Oberon class X11. Naval Vessels, Warship Systems and Naval Architecture: Royal Navy diesel-electric submarine of 1960s-70s.
Oberon, HMS X39. Pre-1900 Maritime History: Royal Navy bomb vessel of 1812, typical of the smaller bomb class.
OBIS D3. Marine environmental science, pollution and conservation: Ocean Biodiversity Information System under IOC-UNESCO.
Object Catalogue X73. Marine Hydrography, Charting and ENC: The IHO S-57 Appendix A defining all ENC feature and attribute classes.
Object Class (S-57) X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Defined feature type such as DEPARE, COALNE, or LIGHTS, encoded in ENC cells with attributes from the IHO S-57 catalogue.
Object Drift X80. Maritime Search and Rescue Coordination: Drift specific to the type of search object.
Object glass X16. Nautical Science, Navigation and COLREGs: Front lens of a telescope or sextant.
Object of safety investigation X163. Marine Accident Investigation Agencies and Landmark Inquiries: Casualty Investigation Code statement that the sole objective is to prevent marine casualties and marine incidents in the future.
Objections to admissibility X152. Maritime Arbitration and Dispute Resolution: Procedural objections to a claim that do not go to the tribunal's jurisdiction, e.g., failure to negotiate first under a multi-tier clause.
OBL X6. Container, Intermodal and Trade Codes: Original Bill of Lading.
Oblique sea B1. Naval Architecture: Wave heading other than head or following.
OBM/ROB Wet/Dry Lines X155. Marine Surveying Practice and Cargo Inspection: The classification of residues found on cargo tank bottoms as wet, dry, or measurable using sounding paste, recorded on the survey ullage report.
OBO Carrier X44. Shipping Indices, FFAs and Freight Markets: Ore-Bulk-Oil vessel design no longer built but historically referenced in cross-segment freight analysis.
OBQ X115. Marine Bunker and Cargo Surveying: Onboard Quantity of residual cargo, sediment, and free water in cargo tanks at the start of loading, measured by ullage survey.
OBQ (On Board Quantity) X5. Marine Surveying and Inspection: Material on board before loading including cargo residue, water, and sediment.
Observation X7. Flag State, Port State Control and Detention Vocabulary: PSC finding recorded without coding as a deficiency, advisory in nature.
Observation (SIRE) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A finding recorded by the inspector under a specific VIQ/CIQ chapter question, expressed in factual terms.
Observation Category (SIRE 2.0) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The HHL/HML/Critical taxonomy applied in SIRE 2.0 risk-based reports.
Observation Closeout X40. Tanker Vetting, SIRE and VIQ: The operator's response to an observation, lodged on the OCIMF platform within the prescribed reply window.
Observation tank X19. Engine Room Watchkeeping and UMS Operations: Small tank between cooler and engine collecting drips for inspection of leakage origin.
Observation Trend Analysis X40. Tanker Vetting, SIRE and VIQ: An operator-side review of recurring observations across the fleet, expected under TMSA Element 7.
Observed altitude (Ho) B3. Nautical Science: Sextant altitude corrected for index, refraction, dip.
Observed Temperature X155. Marine Surveying Practice and Cargo Inspection: The temperature of the oil cargo recorded at the time of measurement, used in conjunction with density to derive volume correction factors.
Observer Coverage X87. Fishing Vessels and Fisheries Management: Proportion of fishing trips with a scientific or compliance observer onboard, set by RFMO measures.
Observer Program D4. Fisheries, aquaculture, blue economy and marine resources: Independent at-sea observation of fishing operations.
Observer Program (RFMO) X87. Fishing Vessels and Fisheries Management: System for placing observers on fishing and carrier vessels to record catch, bycatch, and transshipment.
Observer Status A1. The IMO and the international regulatory framework: Granted to intergovernmental organizations under agreements of cooperation.
Obstacle Avoidance Planner X109. Maritime Autonomous Surface Ships and MASS Code: The autonomy module that revises the local plan in response to detected dynamic and static obstacles.
Obstacle-Free Sector X31. Helicopter Operations on Ships: OFS, 210 degree sector around helideck free of obstacles above deck level.
OCC X82. Saturation Diving and Offshore Diving Operations: Offshore Construction Contractor.
OCC Corporation X91. Submarines and Submarine Cable Systems: Japanese submarine cable manufacturer at Kitakyushu, partner of NEC.
Occasional Survey X5. Marine Surveying and Inspection: Class survey arranged outside scheduled cycle for damage or modifications.
Occluded front X16. Nautical Science, Navigation and COLREGs: Front formed when a cold front overtakes a warm front.
Occulting light X16. Nautical Science, Navigation and COLREGs: Light in which total duration of light exceeds darkness.
Occulting Light (Oc) X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Light character in which total duration of light in a period is longer than the total duration of darkness.
Occupational Health Surveillance Plan X50. Ship Recycling, Demolition and Hong Kong Convention: The yard worker medical monitoring program required under HKC and EU SRR.
Occupational Safety and Health (MLC 4.3) X154. Maritime Welfare, Seafarer Charities, and MLC Rights: Standard requiring shipowner-led OSH programs and incident reporting.
Occurrence X12. Maritime Casualties and Investigation: Generic term used in safety investigation for any reportable event.
OCEA FPB 98 X130. National Coast Guards and Cutter Fleets: Patrol boat design used by Philippine BRP Gabriela Silang and Algerian Garde-Cotes.
Ocean Acidification D3. Marine environmental science, pollution and conservation: Long-term decrease in seawater pH from CO2 uptake.
Ocean Acoustic Tomography D5. Coastal processes, sea-level, cryosphere and ocean observation science: Technique using sound travel times to infer ocean structure.
Ocean Adventurer X97. Polar Expedition Cruise and IAATO Operations: 132 PAX ice-strengthened expedition ship chartered for polar service including by Quark Expeditions.
Ocean Aero Triton X109. Maritime Autonomous Surface Ships and MASS Code: A solar and wind powered autonomous surface and underwater vessel used for ocean observation and security missions.
Ocean Alexander X156. Superyacht Industry, Builders, and Yacht Charter Market: Taiwanese builder at Kaohsiung producing composite motor yachts including the Revolution and Explorer series.
Ocean Blessing (1992) X99. Marine Salvage Awards and SCOPIC: Bulk carrier involved in the Nagasaki Spirit collision whose loss informed the Article 14 reform debate.
Ocean Bottom Seismometer (OBS) D2. Hydrography, tides, waves, bathymetry and marine geology: Seafloor instrument recording earthquake waves.
Ocean Breeze Energy X42. Offshore Wind Installation and Cable Lay: BARD Offshore 1 project operating entity.
Ocean Business X119. Maritime Conferences, Trade Shows and Awards: Biennial Southampton ocean technology trade show since 2007.
Ocean Cable Ship Operators Association X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Industry forum for cable ship operators promoting safe operating practices.
Ocean carrier C3. Logistics, freight forwarding and multimodal trade: Vessel operating carrier in liner trade.
Ocean Cay X24. Cruise, Passenger Ship and Ferry Operations: MSC Cruises private island and marine reserve in the Bahamas.
Ocean College Zhejiang University X121. Maritime Education, Academies and Universities: Marine science and engineering college in Zhoushan campus, founded 2015.
Ocean Color D5. Coastal processes, sea-level, cryosphere and ocean observation science: Visible light reflectance used to estimate phytoplankton and CDOM.
Ocean Connect Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Reference name for an Australian-Pacific cable project announced in 2023.
Ocean conveyor belt X10. Marine Biology, Fisheries and Oceanography: Conceptual model of global thermohaline circulation.
Ocean current X16. Nautical Science, Navigation and COLREGs: Persistent flow of ocean water.
Ocean current chart B3. Nautical Science: Pilot chart with ocean currents.
Ocean current energy X57. Ocean Energy Beyond Wind: Class of marine renewable that targets large persistent currents such as the Gulf Stream and Kuroshio.
Ocean Diamond X97. Polar Expedition Cruise and IAATO Operations: Ice-strengthened expedition ship chartered by Quark Expeditions for Antarctic voyages.
Ocean Disposal of Bycatch X87. Fishing Vessels and Fisheries Management: Discard at sea, restricted under EU landing obligation and many RFMO measures.
Ocean Endeavor X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Diamond Offshore-built semisubmersible based on the Friede Goldman ExD design.
Ocean Endeavour X97. Polar Expedition Cruise and IAATO Operations: 199 PAX expedition ship operated by Sunstone and chartered for polar and Arctic voyages by operators including Adventure Canada.
Ocean Energy Buoy X57. Ocean Energy Beyond Wind: Floating oscillating water column wave device tested in Galway Bay and at the US Navy Wave Energy Test Site.
Ocean Energy Europe X57. Ocean Energy Beyond Wind: Brussels-based industry association representing tidal, wave, OTEC, and salinity gradient stakeholders.
Ocean Engineering Heavy Lift X104. Project Cargo Forwarders and Heavy Transport: Discipline combining naval architecture and rigging for sea transport of project units.
Ocean Engineering Suite X54. Naval Architecture Software and IACS Rules: Generic term for integrated naval architecture and offshore engineering toolchains.
Ocean Frost, The [1986] AC 717 X143. Landmark Maritime Law Cases and Doctrines: House of Lords ruled on apparent authority in a ship sale fraud.
Ocean Group X137. Harbour Tugs, Towage Operators and Tug Builders: Quebec-based Canadian tug and salvage operator, working St. Lawrence and Eastern Canadian ports.
Ocean Heat Content (Anomaly) D5. Coastal processes, sea-level, cryosphere and ocean observation science: Departure of OHC from a reference period.
Ocean Independence X35. Yacht and Superyacht Industry: Swiss-headquartered brokerage and charter management group.
OCEAN INFINITY X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Marine robotics company operating Armada-class uncrewed survey vessels for hydrographic and seabed mapping projects.
Ocean Liner E4. Cruise, offshore energy and auxiliary/specialised fleets: Traditional transoceanic passenger ship.
Ocean Liner Era F1. Maritime History: Roughly 1870 to 1960, the dominance of scheduled passenger steamers on transoceanic routes.
Ocean Liner Memorabilia F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Steamship company china, posters, and menus.
Ocean Marine Insurance X117. Marine Insurance Markets, Captives and Reinsurance: The US term for blue-water marine insurance, distinct from inland marine.
Ocean Marine Insurance Company X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Bermuda-based reinsurer for several IG clubs.
Ocean Network Express Agency X86. Port Agency, Husbandry and Disbursement: ONE agency network at calling ports.
Ocean Network Express Bunker Desk X72. Bunkering Hubs and Bunker Suppliers: In house bunker procurement function of Ocean Network Express in Singapore and Yokohama.
Ocean Observatories Initiative (OOI) D5. Coastal processes, sea-level, cryosphere and ocean observation science: US NSF program of cabled and global ocean observatories.
Ocean Passages for the World (NP136) X16. Nautical Science, Navigation and COLREGs: UKHO publication describing recommended ocean routes.
Ocean Patriot X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Diamond Offshore second-generation semisubmersible operating in Australia.
Ocean Pilot Charts F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Climatological pilot charts published by NGA.
Ocean Princess X64. Cruise Industry Operators, Brands and Ships: Former Princess Cruises R-class ship sold to Oceania in 2016.
Ocean Race, The F4. Recreational Boating, Yachting and Sport: Crewed round-the-world race formerly known as the Volvo and Whitbread.
Ocean Ranger X14. Offshore Oil and Gas Marine Operations: ODECO semi-submersible lost off Newfoundland 1982; 84 fatalities.
Ocean Reanalysis D5. Coastal processes, sea-level, cryosphere and ocean observation science: Long-term ocean state estimate combining models and observations.
Ocean Renewable Energy Action Coalition X42. Offshore Wind Installation and Cable Lay: Industry coalition supporting offshore wind grid integration.
Ocean Salvage X60. Marine Salvage and Wreck Removal: Greek salvage company based in Athens.
Ocean Shield X127. Maritime Security, Anti-Piracy and PMSCs: NATO Operation Ocean Shield, counter-piracy operation off Somalia from 17 August 2009 to 15 December 2016.
Ocean Shores X124. Dredging Industry and Reclamation Contractors: Washington state beach nourishment program.
Ocean Signal X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: UK manufacturer of compact EPIRBs (rescueME EPIRB1 and EPIRB3) and AIS-SARTs (rescueME MOB1).
Ocean Signal rescueME EDF1 X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal electronic distress flare with LED light source.
Ocean Signal rescueME EPIRB1 X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal compact 406 MHz Cospas-Sarsat EPIRB with internal 66-channel GPS.
Ocean Signal rescueME MOB1 X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal personal AIS man overboard device with DSC alerting transmitting on AIS channels 87B and 88B.
Ocean Signal rescueME PLB1 X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal personal locator beacon transmitting on 406 MHz Cospas-Sarsat with internal GPS.
Ocean Signal rescueME SART X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal 9 GHz X band radar Search and Rescue Transponder.
Ocean Signal SafeSea E101G EPIRB X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal Category I/II 406 MHz Cospas-Sarsat EPIRB with internal GPS.
Ocean Signal SafeSea V100 GMDSS X95. GMDSS Equipment and Survival Craft Communications: Ocean Signal two way portable VHF radio for survival craft use.
Ocean Specialists Inc (OSI) X122. Submarine Cable Laying, Repair Vessels and Operators: Florida-based marine survey and consulting firm performing route surveys for many submarine cable systems.
Ocean Spirit of Moray X128. Sail Training Ships and Tall Ship Associations: UK Bermudan ketch, 22 m length, operated by Ocean Youth Trust Scotland.
Ocean Surveillance Information System (OSIS) E2. Naval, defence and maritime law enforcement: Historic intelligence collection net.
Ocean Technology Foundation Programs F3. Seafaring Life, Education, Professions and Institutions: STEM-to-sea pipeline initiatives.
Ocean Technology Group Welfare Initiative X102. Seafarer Welfare and Maritime Charities: Generic pattern for corporate maritime welfare partnerships with charities like Sailors' Society.
Ocean Tow X60. Marine Salvage and Wreck Removal: Long distance towage of a vessel or unit across ocean basins.
Ocean Tow to Yard X28. Ship Recycling and End-of-Life: Towage of dead ships to recycling facilities, requiring tow approval and weather routing.
Ocean Tug X79. Tugs and Towage Industry: Tug certified and equipped for unrestricted ocean towage.
Ocean Victory, The X143. Landmark Maritime Law Cases and Doctrines: See Gard Marine, the UK Supreme Court 2017 ruling on safe port warranty.
Ocean Voyage to Recycling Yard X50. Ship Recycling, Demolition and Hong Kong Convention: The final delivery voyage of an end-of-life vessel, often requiring flag and class clearance under specific terms.
Ocean Wind 1 X105. Offshore Wind Farm Installation and Vessels: 1.1 GW Ørsted-led US offshore wind project off New Jersey cancelled in 2023.
Ocean Winds X42. Offshore Wind Installation and Cable Lay: Joint venture between EDPR and Engie developing offshore wind globally including Moray East, Moray West, and BC Wind.
Ocean Youth Trust X128. Sail Training Ships and Tall Ship Associations: UK federated youth sail training charity (founded 1960 as Ocean Youth Club) operating multiple Bermudan ketches and other vessels, member of UK Sail Training.
Ocean-going ship cut-off X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Under the HKC the Convention applies to ships of 500 GT and above engaged in international voyages.
Ocean-Going Tug X30. Tug Operations and Harbour Towage: Tug certified for ocean towage of large barges, rigs, or disabled ships.
OceanAero Triton X65. ROVs, AUVs, USVs and Marine Robotics: Wind and solar powered USV with submersible capability from Ocean Aero.
Oceanbird X111. Methanol, Ammonia and Alternative Marine Fuels: Wallenius Marine and Stena RoRo wind-assisted vessel concept exploring methanol auxiliary fuel and sail-assisted propulsion.
Oceanco X35. Yacht and Superyacht Industry: Dutch superyacht builder in Alblasserdam owned by Mohammed Al Barwani.
OceanConnect Marine X72. Bunkering Hubs and Bunker Suppliers: Bunker trader merged into KPI Bridge Oil in 2019 inside Bunker Holding.
Oceaneering International X65. ROVs, AUVs, USVs and Marine Robotics: Largest commercial ROV operator, owner of the Magnum, Maxximum, Millennium Plus, Spectrum, E-Magnum and MHF fleets.
Oceaneering Training Center X55. Marine Simulators, Training and Maritime Academies: Industry training facility providing ROV pilot and offshore competency courses.
Oceania (research) X128. Sail Training Ships and Tall Ship Associations: Polish research and sail training schooner built 1985 at Gdansk, 49 m length, operated by Institute of Oceanology PAS Sopot.
Oceania Allura X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises Allura-class ship delivered in 2025.
Oceania Cruises X24. Cruise, Passenger Ship and Ferry Operations: Upper-premium brand within NCLH.
Oceania Marina X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises ship delivered in 2011.
Oceania Nautica X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises R-class ship operated since 2005.
Oceania Regatta X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises R-class ship operated since 2003.
Oceania Riviera X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises ship delivered in 2012.
Oceania Sirena X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises R-class ship operated since 2016.
Oceania Vista X64. Cruise Industry Operators, Brands and Ships: Oceania Cruises Allura-class ship delivered in 2023.
OCEANIC (cable system) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Subsea cable project connecting Italy to Tunisia and Algeria.
Oceanic Crust D2. Hydrography, tides, waves, bathymetry and marine geology: Outer layer of ocean basins, dominantly basaltic.
Oceanic Mixed Layer Depth Climatology D1. Physical and chemical oceanography and marine meteorology: Reference datasets such as de Boyer Montegut compilations.
Oceanic Olympia X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Constellation Oil Services drillship operating offshore Brazil.
Oceanic Plateau D2. Hydrography, tides, waves, bathymetry and marine geology: Large submarine elevation formed by voluminous basaltic volcanism.
Oceanic Whitetip shark X10. Marine Biology, Fisheries and Oceanography: *Carcharhinus longimanus*.
Oceankaj Terminal X164. Cruise Industry, Brands, Ship Classes, and Terminals: The Copenhagen cruise terminal in Nordhavn district, capable of handling three of the largest cruise ships simultaneously.
OceanMind X74. AIS Data, Vessel Tracking and Maritime Intelligence: UK non-profit using AIS and other data to support fisheries compliance.
Oceanographic Atlas D1. Physical and chemical oceanography and marine meteorology: Compilation of climatological ocean properties, such as the World Ocean Atlas.
Oceanographic Cast X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Lowering of a CTD or sound velocity profiler to obtain a water column profile in support of multibeam corrections.
Oceanographic Museum of Monaco F2. Maritime Culture, Heritage, Archaeology, Art and Museums: Founded by Prince Albert I in 1910.
Oceanology International X119. Maritime Conferences, Trade Shows and Awards: Biennial London marine science and technology exhibition since 1969.
Oceanology International Americas X119. Maritime Conferences, Trade Shows and Awards: Triennial San Diego edition launched 2015.
Oceanology International Asia Pacific X119. Maritime Conferences, Trade Shows and Awards: Biennial Singapore or Shanghai edition launched 2018.
OceanRoutes X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Voyage routing service originally founded in 1971 and now part of StormGeo's BVS service portfolio.
Oceans of Energy X57. Ocean Energy Beyond Wind: Dutch offshore floating solar developer that has operated a pilot array off the Dutch North Sea coast.
OceanSaver BWMS X18. Ballast Water, Biofouling and Antifouling: Filtration plus electrodialysis BWMS, vendor entered restructuring in 2017.
OceanScan MARES X65. ROVs, AUVs, USVs and Marine Robotics: See MARES.
OceanScore X29. Ship Sale and Purchase, Management Contracts and Valuation: Hamburg based fleet emissions and management analytics provider.
OceanWaveS X96. Hull Integrity Monitoring and Strain Gauges: German company supplying the WaMoS wave radar systems.
Oceanweather Inc X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Marine weather analysis company providing wave hindcasts and forecasts for routing services.
Oceanwide Expeditions X97. Polar Expedition Cruise and IAATO Operations: Netherlands-based polar expedition operator running Plancius, Ortelius, Hondius, and Janssonius.
OCEMA X6. Container, Intermodal and Trade Codes: Ocean Carrier Equipment Management Association, US chassis and equipment pool body.
OCI Beaumont X140. Ammonia as Marine Fuel and Hydrogen Shipping: 1.1 Mtpa ammonia plant in Texas owned by OCI Global.
OCI Geleen X140. Ammonia as Marine Fuel and Hydrogen Shipping: Dutch ammonia complex producing 1.1 Mtpa with conversion to green NH3 under study.
OCIMF A7. Compliance, certification and enforcement: Oil Companies International Marine Forum, owner of SIRE.
OCIMF (Oil Companies International Marine Forum) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The voluntary association of oil companies founded in 1970 in response to the Torrey Canyon disaster, headquartered in London.
OCIMF General Purposes Committee X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The OCIMF body overseeing SIRE program governance.
OCIMF MEG4 C4. Ports, terminals and coastal/marine civil engineering: Standard reference on mooring of tankers and gas carriers.
OCIMF Member Company X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A voting oil major or oil trader within OCIMF with access to SIRE reports.
OCIMF Mooring Equipment Guidelines for LNG X110. LNG Bunkering Infrastructure and Vessels: Oil Companies International Marine Forum guidance covering mooring arrangements for LNG carriers and bunker operations.
OCIMF Programme Recipient X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: A non-member company (typically a port, government, or terminal) that may receive SIRE reports under defined access rules.
OCIMF SIRE X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Ship Inspection Report Programme used to vet tankers and shuttle tankers serving FSOs and FPSOs.
OCIMF SIRE 2.0 X25. Maritime Cybersecurity, OT and IT: Tanker inspection regime succeeding the SIRE program with a behavioral and cyber emphasis, launched 2024.
OCIMF SIRE Inspection X5. Marine Surveying and Inspection: Tanker vetting inspection under OCIMF Ship Inspection Report Exchange.
OCIMF TMSA Element 13 X48. Maritime Cybersecurity: Element of the Oil Companies International Marine Forum's Tanker Management and Self Assessment program focused on maritime security including cybersecurity.
OCIMF VIQ 7 X25. Maritime Cybersecurity, OT and IT: Vessel Inspection Questionnaire version 7, with Section 7.5 covering cyber security.
OCIMF/SIGTTO STS Best Practice X20. LNG Operations and Custody Transfer: Joint guidance on LPG/LNG ship-to-ship transfer operations.
OCO-2/OCO-3 D5. Coastal processes, sea-level, cryosphere and ocean observation science: NASA satellites measuring atmospheric CO2.
OCP X6. Container, Intermodal and Trade Codes: Overland Common Point, historic US rate territory served by inland transport from West Coast ports.
OCR (Optical Character Recognition) X94. Port Machinery and Quay Equipment Makers: Camera-based system on STS and gate cranes that reads container ID, ISO code, and IMO seal data automatically.
OCR gate X15. Ports, Terminals and Stevedoring: gate with optical character recognition reading container, chassis, and license plate IDs.
OCR Portal X46. Container Terminal Operations: A gantry or canopy fitted with cameras and lighting that captures container number, ISO code, IMO placards, and damage imagery as the box passes underneath.
OCS X73. Marine Hydrography, Charting and ENC: NOAA Office of Coast Survey.
OCS (Open-Loop Cooling System) X20. LNG Operations and Custody Transfer: Seawater intermediate fluid vaporizer in FSRU; environmentally restricted in some jurisdictions.
OCT X15. Ports, Terminals and Stevedoring: Optical Container Tracking at the apron.
Octanitrocubane X75. IMDG Code, Classes, Packing and Segregation: Not regulated under IMDG as a standard UN entry; included only to caution against fictional entries.
Octans North Atlantic X91. Submarines and Submarine Cable Systems: Reference to North Atlantic operational area for submarines and cable ships.
Octant X39. Pre-1900 Maritime History: A reflecting navigational instrument with a forty-five degree arc, devised independently by Hadley and Godfrey around 1731.
Octolite Dry X75. IMDG Code, Classes, Packing and Segregation: UN 0266, Class 1.1D explosive substance.
Octopi X138. Global Container Terminal Operators and Port Equipment: Cloud-based TOS by Navis targeting small to mid-size terminals, launched 2018.
Octopus X10. Marine Biology, Fisheries and Oceanography: Cephalopod of the order Octopoda with eight arms.
Octopus Energy Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Reference to Octopus Energy's investments in offshore wind export cable equity.
Octopus Wind Hub X109. Maritime Autonomous Surface Ships and MASS Code: A 2025 era Wallenius Wilhelmsen concept supporting Orcelle Wind unmanned wind powered vessels.
Octuple launcher X11. Naval Vessels, Warship Systems and Naval Architecture: Mk 16 ASROC launcher with eight cells.
Octyl Trichlorosilane X75. IMDG Code, Classes, Packing and Segregation: UN 1801, Class 8 corrosive liquid Packing Group II.
OCV X14. Offshore Oil and Gas Marine Operations: Offshore construction vessel; heavy crane and subsea install capability.
OCV (Offshore Construction Vessel) E4. Cruise, offshore energy and auxiliary/specialised fleets: Heavy-lift/subsea-construction vessel.
OD-box (oil distribution box) X38. Propellers, Stern Gear and Shaft Lines: Stationary housing transferring servo oil through a rotating shaft to the CPP hub.
Odebrecht Oil & Gas X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Brazilian drilling contractor merged into the broader Ocyan and Constellation entities.
Oden X52. Polar Code, Arctic and Antarctic Shipping: Swedish state icebreaker and polar research vessel built in 1988, operated by the Swedish Maritime Administration.
Oder X33. Inland Navigation and Barge Operations: River navigable between Szczecin and the upper Oder canal system, shared by Germany and Poland.
Oder Estuary X124. Dredging Industry and Reclamation Contractors: Polish-German waterway whose maintenance is run jointly.
Odessa CTO Container Terminal X138. Global Container Terminal Operators and Port Equipment: HHLA International facility on Ukrainian Black Sea, operations disrupted since February 2022 invasion.
Odessa National Maritime Academy X160. Maritime Academies, Universities, and STCW Certification: Ukrainian state maritime university in Odessa, renamed National University Odessa Maritime Academy, founded in 1944.
Odfjell X93. IBC Code and Chemical Tanker Operations: Norwegian deep-sea chemical tanker operator headquartered in Bergen with a global parcel tanker fleet.
Odfjell Drilling X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Norwegian drilling contractor operating harsh-environment semisubmersibles such as the Aker Barents.
Odfjell SE X135. Chemical Tanker Operators and IBC Code Cargoes: Bergen-Norway based listed company founded by Fred Olsen and Odfjell families in 1916, operator of around 90 IMO Type 2 chemical tankers and 18 chemical terminals through Odfjell Terminals worldwide.
Odfjell Terminals X135. Chemical Tanker Operators and IBC Code Cargoes: Joint venture network of chemical storage terminals with Lindsay Goldberg and Vopak partners covering Rotterdam, Houston, Charleston, Jiangyin and Onsan.
Odisha Maritime Academy X121. Maritime Education, Academies and Universities: Indian state maritime training centre in Paradip.
Odjfell Deepsea Stavanger X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Moss CS-60-based harsh-environment semisubmersible operated by Odfjell Drilling.
ODMCS A3. Marine environmental legislation: MARPOL and its annexes: Oil Discharge Monitoring and Control System under MARPOL Annex I.
ODMCS (Oil Discharge Monitoring and Control System) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary: The system required under MARPOL Annex I Reg 31 on every oil tanker of 150 GT and above, automatically recording oil content, discharge rate, ship speed, and position.
Odontocete X10. Marine Biology, Fisheries and Oceanography: Member of the cetacean suborder Odontoceti (toothed whales).
ODS Reception X94. Port Machinery and Quay Equipment Makers: Port facility for receiving recovered ozone-depleting substances from ship refrigeration and HVAC systems.
Odyssey of the Seas X64. Cruise Industry Operators, Brands and Ships: Royal Caribbean Quantum Ultra-class ship delivered in 2021.
OECD Council Decision C(2001)107 X118. Ship Recycling Yards, Beaches and Regulation: Decision on the control of transboundary movements of wastes destined for recovery operations; relevant where ship is a waste under Basel.
OECD-to-non-OECD ship movement X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Transboundary movement scrutinized under the Basel Ban Amendment regime.
OECM (Other Effective Area-Based Conservation Measure) D3. Marine environmental science, pollution and conservation: Non-MPA areas delivering conservation outcomes.
OECS X124. Dredging Industry and Reclamation Contractors: Eastern Caribbean port maintenance market.
OEI X31. Helicopter Operations on Ships: One Engine Inoperative, performance condition with one powerplant failed.
OEM X6. Container, Intermodal and Trade Codes: Original Equipment Manufacturer, often relevant to project cargo bookings.
OEM (Original Equipment Manufacturer) X139. Maritime Cybersecurity, OT Threats and Standards: Supplier of OT systems whose role under IACS UR E27 includes secure development and maintenance.
OEM approval X61. Marine Lubricants and Cylinder Oils: Engine builder endorsement issued after testing that confirms a lubricant meets stipulated performance for a given engine series.
OEM Remote Access X48. Maritime Cybersecurity: Connection used by an original equipment manufacturer to support shipboard equipment, often via satcom and a vendor portal.
OEM Sonar X129. Hydrographic Offices, Survey Vessels and Marine Cartography: Sonar electronics packaged for integration into third-party platforms, common in AUV and ASV installations.
OEM specification X61. Marine Lubricants and Cylinder Oils: Lubricant performance requirement issued by an engine manufacturer such as MAN Energy Solutions or WinGD.
OERTL X31. Helicopter Operations on Ships: Offshore Emergency Response Team Leader, OPITO senior emergency role qualification.
OERTM X31. Helicopter Operations on Ships: Offshore Emergency Response Team Member, OPITO basic emergency team qualification.
OES Environmental X57. Ocean Energy Beyond Wind: International Energy Agency initiative tracking environmental effects of marine renewable energy.