ShipCalculators.com

Glossary

Maritime glossary, terms beginning with O (page 4)

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

Showing 250 of 1233 terms (page 4 of 5).

Operational Period X13. Marine Salvage and Wreck Removal
Defined work cycle under ICS for salvage execution and reporting.
Operational Phase X80. Maritime Search and Rescue Coordination
SAR phase between commencement and termination of active search.
Operational Profile X67. Marine Electrical Systems and Shore Power
Time-weighted load distribution used to size hybrid battery and genset plants.
Operational Requirements X93. IBC Code and Chemical Tanker Operations
Subject of IBC Code Chapter 16 covering procedures and operations applicable to chemical tankers.
Operational sea trial B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling
Charter-acceptance trial.
Operational standards C2. Ship operations, crewing and technical management
TMSA, RightShip, and class-issued operational benchmarks.
Operational Suitability X75. IMDG Code, Classes, Packing and Segregation
Requirement that packaging be suitable for the substance and intended transport conditions, IMDG 4.1.1.
Operational Sulfur Compliance Plan X115. Marine Bunker and Cargo Surveying
Vessel-specific plan addressing fuel changeover, tank cleaning, and sampling to comply with sulfur cap requirements.
Operational Survey X43. Marine Surveying and Warranty Surveying
An inspection focused on operational systems and procedures as distinct from structural or machinery condition.
Operational Tactical Order (Fishing Vessel) X87. Fishing Vessels and Fisheries Management
Internal command from skipper to mate and crew during fishing operations.
Operational Technology X48. Maritime Cybersecurity
Hardware and software that detects or causes changes through direct monitoring or control of physical devices on board.
Operational Technology Network X68. Maritime Satcom and Telecommunications
Vessel network segment carrying control system traffic, kept logically separate from crew internet.
Operational Test X5. Marine Surveying and Inspection
Functional test of equipment under simulated or actual conditions.
Operational Waste (Category F Annex V) X171. MARPOL 73/78: Annex-by-Annex Detailed Glossary
Garbage category for solid wastes including cleaning agents and additives in cargo holds and external surfaces, with discharge prohibited.
Operationally Generated Wastes X118. Ship Recycling Yards, Beaches and Regulation
IHM Part II inventory category, including sludge, bilge, slops, used filters, and similar wastes.
Operations and Maintenance X59. Offshore Wind O&M, CTVs and SOVs
Phase of the wind farm life cycle covering all activities after commissioning handover, also abbreviated O&M.
Operations and maintenance vessel X57. Ocean Energy Beyond Wind
Service operations vessel or crew transfer vessel class used for tidal, wave, floating solar, and CCS sites.
Operations Department X17. Chartering, Shipbroking and Freight Trading
Owner or charterer team handling voyage execution after fixing.
Operations Manual F5. The Reference Layer: Glossary, Units, Signals and Information Sources
Statutory ISM-mandated documentation onboard.
Operations Manual Heavy Lift X104. Project Cargo Forwarders and Heavy Transport
Carrier manual describing approved heavy lift procedures and limits.
Operations Section Chief X13. Marine Salvage and Wreck Removal
ICS role directing tactical salvage activity on scene.
Operator X40. Tanker Vetting, SIRE and VIQ
The entity exercising operational control of the vessel and holding the Document of Compliance under the ISM Code.
Operator (SIRE) X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA
The ISM-responsible company under whose DOC the vessel operates, accountable for SIRE submissions.
Operator Comments X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA
The formal SIRE response field where the operator addresses each observation with corrective and preventive action.
Operator desk X71. Shipbrokers and Brokerage Firms
Broker or in-house team taking principal risk on a portfolio of fixtures.
Operator Self-Inspection X41. Cruise Ship Public Health and VSP/USPH
Periodic inspection performed by the ship environmental officer using the VSP item structure.
Operator-Owned Container X83. ISO Container Manufacturing and Leasing
Container owned by an operating carrier rather than by a leasing company.
Operator's Cable Maintenance Agreement (OCMA) X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
Bilateral arrangement between two cable operators for specific maintenance services.
Operator's Extra Expense (OEE) X4. Marine Insurance, P&I and Claims
energy-related cover for blowout control.
Operator's Inventory of Hazardous Materials X50. Ship Recycling, Demolition and Hong Kong Convention
The shipping company maintained IHM under MEPC.269(68) governance.
Operator's Manual X9. Cargo Securing, Lashing and Stability Vocabulary
Manufacturer's instruction for securing equipment.
Operator's TCE X44. Shipping Indices, FFAs and Freight Markets
Reported daily earnings figure used by operators to disclose voyage performance and benchmark against Baltic averages.
OPEX (Decarbonization) X34. Decarbonization, Alternative Fuels and Carbon Pricing
Operating cost of alternative fuels and abatement technologies.
OPEX optimization (marine) X57. Ocean Energy Beyond Wind
Operational expenditure reduction strategies through condition-based maintenance at tidal, wave, and CCS sites.
OPGW X122. Submarine Cable Laying, Repair Vessels and Operators
Optical Ground Wire, used on overhead transmission lines and listed here to distinguish from submarine fiber.
OPGW (Optical Ground Wire) Submarine Crossing X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
Submarine variant of OPGW used at river or short estuary crossings combining a ground conductor with optical fibers.
Ophiolite D2. Hydrography, tides, waves, bathymetry and marine geology
Fragment of ancient oceanic crust and upper mantle exposed on land.
Opioid analgesic stewardship X36. Shipboard Medical, Telemedicine and Seafarer Health
Controlled drug register, double-lock storage, and master oversight per flag-state rules.
OPIS X101. Vessel Brokerage Software and Chartering Platforms
Oil Price Information Service, a US energy price reporting agency owned by News Corp's Dow Jones since 2022.
OPITO X14. Offshore Oil and Gas Marine Operations
Offshore safety training accreditation body (BOSIET, MIST, HUET).
Opium Clipper F1. Maritime History
Mid-nineteenth century fast vessel in the China opium trade.
OPL X116. Global Bunker Anchorages, Hubs and Supply Infrastructure
Off Port Limits, the regime governing STS bunkering outside formal port jurisdiction such as Fujairah OPL.
OPL Anchorage (Singapore) X151. Maritime Sanctions, Dark Fleet, and Price Cap Regimes
Outside Port Limits anchorages near Singapore used for STS transfers under reduced regulatory oversight, repeatedly flagged in advisories.
Oporto Wine Trade X39. Pre-1900 Maritime History
English-Portuguese trade in port wine regulated by the Methuen Treaty of 1703.
Opportunistic Attack X127. Maritime Security, Anti-Piracy and PMSCs
Pirate engagement against any target of opportunity within range, contrasted with planned hijack.
OPRC X14. Offshore Oil and Gas Marine Operations
Oil Pollution Preparedness, Response and Co-operation convention (IMO 1990).
OPRC 1990 X13. Marine Salvage and Wreck Removal
International Convention on Oil Pollution Preparedness, Response and Cooperation.
OPRC 90 X126. Marine Oil Spill Response and OPRC Regimes
International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990, entered into force May 13, 1995, mandating shipboard SOPEPs and national preparedness systems.
OPRC Convention X146. Port State Control Regimes, MoUs, and Inspection Systems
The International Convention on Oil Pollution Preparedness, Response and Co-operation 1990, referenced in MARPOL-related PSC findings.
OPRC Convention Linkage X28. Ship Recycling and End-of-Life
Oil pollution preparedness at recycling sites under OPRC 1990.
OPRC plan C2. Ship operations, crewing and technical management
Oil pollution emergency plan under OPRC Convention.
OPRC-HNS Protocol 2000 X126. Marine Oil Spill Response and OPRC Regimes
Protocol extending the OPRC 90 framework to hazardous and noxious substances, in force June 14, 2007.
OPRED X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
UK Offshore Petroleum Regulator for Environment and Decommissioning, overseeing offshore pipeline environmental approvals.
OPRL Ports X60. Marine Salvage and Wreck Removal
List of ports declared by states to accept oil spill response support.
OPRP X41. Cruise Ship Public Health and VSP/USPH
Outbreak Prevention and Response Plan, ship-specific written program required by VSP for managing acute gastroenteritis events.
OPS X15. Ports, Terminals and Stevedoring
Onshore Power Supply, IEC/IEEE/ISO 80005-1 standard.
OPS (Onshore Power Supply) X2. Marine Bunker Fuels, Lubricants and Bunkering Operations
Shore power connection enabling main and auxiliary engine shutdown at berth.
OPS Connection at Recycling Berth X118. Ship Recycling Yards, Beaches and Regulation
Some EU yards provide shore power at quayside recycling berths; not standard at South Asian beaches.
OPS Manifold X20. LNG Operations and Custody Transfer
Ship-side connection for shore power, IEC/IEEE 80005-1 compliant on LNGCs.
OPS-24 X62. Naval Warships and Combat Systems
Japanese 3D air search radar fitted on Asagiri and other JMSDF surface combatants.
OPS-50 X62. Naval Warships and Combat Systems
Designation associated with FCS-3-family radars on Japanese ships.
OPSEALOG Training Center X121. Maritime Education, Academies and Universities
French data analytics training for shipping fuel optimization.
Optical Add-Drop Multiplexer (OADM) X91. Submarines and Submarine Cable Systems
Network element allowing addition or extraction of wavelengths in submarine cable systems.
Optical Character Recognition (OCR) Gate E3. Technology, digitalization and smart shipping
Automated terminal gate using camera/OCR.
Optical Heading Sensor X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS
Fiber-optic gyro device sensing heading via Sagnac interferometry without rotating mass.
Optical Holiday Detection X60. Marine Salvage and Wreck Removal
Inspection of patches for pinholes after temporary repair.
Optical Identification X109. Maritime Autonomous Surface Ships and MASS Code
The use of cameras and computer vision to read vessel names, port marks, and other visual identifiers.
Optical mooring monitoring X15. Ports, Terminals and Stevedoring
laser-based DAS systems measuring vessel motion.
Optical range X16. Nautical Science, Navigation and COLREGs
Distance at which a light is theoretically visible by eye.
Optical Time Domain Reflectometer (OTDR) X91. Submarines and Submarine Cable Systems
Instrument used to locate faults along submarine optical cables.
Optima Shipbrokers X71. Shipbrokers and Brokerage Firms
Piraeus-based shipbroker active in dry bulk and tankers.
Optimarin Ballast System (OBS) X18. Ballast Water, Biofouling and Antifouling
Filtration plus medium-pressure UV BWMS by Optimarin AS of Norway.
Optimarin BWMS X113. Drydock and Ship Repair Yards
Norwegian ultraviolet ballast water treatment system retrofitted under IMO D-2 compliance programs.
Optimarin BWTS B2. Marine Engineering
UV-based ballast treatment system.
Optimist X84. Yacht Racing, Regattas and Sailing Governance
A single-handed pram dinghy designed by Clark Mills in 1947, the dominant global youth trainer.
Optimist Dinghy F4. Recreational Boating, Yachting and Sport
Bermudan-rigged child's single-hander, world's most numerous racing class.
Optimization (Voyage) D6. Decarbonization, emissions and alternative fuels
Routing and trim optimization for fuel savings.
Optimization study X61. Marine Lubricants and Cylinder Oils
Engineering review of cylinder oil feed rate, BN selection, and fuel sulfur to minimize wear and operating cost.
Optimoor X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral
Mooring analysis software developed by Tension Technology International for static and quasi-dynamic ship-at-berth analysis.
Optimum diameter (B_p chart) X38. Propellers, Stern Gear and Shaft Lines
Diameter chosen from B_p delta charts (Schoenherr, Bp-delta) for given power, RPM, and ship speed.
Optimum hopper load X124. Dredging Industry and Reclamation Contractors
Sediment load at which TSHD economics peak before overflow losses dominate.
Optimum Yield D4. Fisheries, aquaculture, blue economy and marine resources
US legal concept balancing economic, social, and ecological goals.
Optimus X65. ROVs, AUVs, USVs and Marine Robotics
Sea-Kit USV designed for offshore survey and IMR support with deployable AUV and ROV payloads.
Option on FFA X44. Shipping Indices, FFAs and Freight Markets
Derivative granting the right but not the obligation to enter into an FFA at a strike level, cleared by SGX, EEX, or CME.
Option to purchase C1. Commercial shipping, chartering, economics and finance
Right of charterer or third party to buy the vessel.
Optional Cancelling X29. Ship Sale and Purchase, Management Contracts and Valuation
Buyer right to cancel if delivery missed by cancelling date.
Optional Cargo X17. Chartering, Shipbroking and Freight Trading
Cargo that may be carried at charterer's option, often with rate adjustment.
Optional Cargoes Clause X51. Maritime Arbitration, Law and BIMCO Clauses
A voyage charter provision permitting nomination of alternative cargoes from a specified list.
Optional Prepayment X49. Ship Finance, Leasing and Maritime Capital Markets
Borrower right to prepay principal subject to notice and any break funding.
OPUS Terminal X46. Container Terminal Operations
A terminal operating system developed by CyberLogitec used at container terminals in Asia, the Middle East, and the Americas.
OPV X11. Naval Vessels, Warship Systems and Naval Architecture
Offshore Patrol Vessel, lightly armed constabulary ship.
OPV (Offshore Patrol Vessel) E2. Naval, defence and maritime law enforcement
Constabulary patrol ship for EEZ/SAR.
OPV-A X130. National Coast Guards and Cutter Fleets
Indian Coast Guard Sankalp-class advanced offshore patrol vessel, lead ship ICGS Sankalp built by Goa Shipyard 2012.
OPV-B X130. National Coast Guards and Cutter Fleets
Indian Coast Guard Vikram-class, lead ship ICGS Vikram, built by L and T Kattupalli 2017.
OQ Trading Bunker X72. Bunkering Hubs and Bunker Suppliers
Bunker arm of Omani state group OQ supplying bunkers at Sohar and Duqm.
Oracle Team USA X84. Yacht Racing, Regattas and Sailing Governance
The Golden Gate Yacht Club syndicate that defended the America's Cup in 2013 and lost it in 2017.
Oral evidence X152. Maritime Arbitration and Dispute Resolution
Live witness testimony given at hearing, subject to cross-examination and tribunal questions.
Oral Examination (Orals) X160. Maritime Academies, Universities, and STCW Certification
UK MCA, Indian DG Shipping, and similar flag-state assessment of a CoC candidate's competence delivered face-to-face by a flag-appointed examiner.
Oral rehydration salts (ORS) X36. Shipboard Medical, Telemedicine and Seafarer Health
WHO-formula sachets for diarrheal illness; IMGS Annex IV.
Orange Book X75. IMDG Code, Classes, Packing and Segregation
Informal name for the UN Recommendations on the Transport of Dangerous Goods Model Regulations.
Orange carriage X26. Reefer Containers and Cold Chain Logistics
4 C, 85 to 90% RH; cold-treatment-host for fruit flies in many trade lanes.
Orange Hazard Label Background (Class 1) X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers
Per 5.2.2.2 the explosives label background is orange.
Orange Label (Class 1) X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers
Background colour for primary hazard labels of Division 1.1, 1.2, 1.3, 1.4, 1.5, and 1.6 explosives.
Orange Marine X91. Submarines and Submarine Cable Systems
French submarine cable installation and maintenance operator, subsidiary of Orange.
Orange roughy X10. Marine Biology, Fisheries and Oceanography
*Hoplostethus atlanticus*, a long-lived deep-sea fish.
Orange-Peel Grab X94. Port Machinery and Quay Equipment Makers
Multi-tine hydraulic grab used for scrap and irregular bulk cargo at port material handlers.
ORB Part I C2. Ship operations, crewing and technical management
Machinery space oil record book.
ORB Part II C2. Ship operations, crewing and technical management
Cargo and ballast operations oil record book.
ORBCOMM X74. AIS Data, Vessel Tracking and Maritime Intelligence
US satellite operator providing satellite AIS data from its OG2 constellation.
ORBCOMM AIS X74. AIS Data, Vessel Tracking and Maritime Intelligence
Service name for the satellite AIS data feed delivered by ORBCOMM in partnership with PolarSat and Luxspace.
ORBCOMM ReeferConnect X70. Reefer Containers and Cold Chain Shipping
Telematics platform offered by ORBCOMM for remote monitoring of reefer containers and intermodal assets.
Orbit AL-7103 X68. Maritime Satcom and Telecommunications
ORBIT Communication Systems stabilized maritime tracking antenna.
ORBIT Communication Systems X68. Maritime Satcom and Telecommunications
Israeli manufacturer of stabilized maritime and aeronautical antennas.
Orbital Marine Power X57. Ocean Energy Beyond Wind
Scottish floating tidal energy developer that operates the O2 turbine in Orkney waters.
Orbital Wave Velocity D2. Hydrography, tides, waves, bathymetry and marine geology
Particle motion under surface gravity waves.
OrbitMI X78. Voyage Optimization and Vessel Performance Software
A vessel performance and voyage optimization software vendor offering an integrated platform for owners, operators, and charterers.
ORC X84. Yacht Racing, Regattas and Sailing Governance
Offshore Racing Congress, administrator of the ORC International and ORC Club rating systems.
ORC Club F4. Recreational Boating, Yachting and Sport
Simplified handicap of the ORC system.
ORC, Offshore Racing Congress F4. Recreational Boating, Yachting and Sport
International offshore rating organization based in Cologne.
Orca X97. Polar Expedition Cruise and IAATO Operations
Killer whale (Orcinus orca) widely encountered in polar waters with distinct ecotypes in Antarctic and Arctic seas.
Orca Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
Norwegian cable infrastructure tied to North Sea data center expansion.
Orca3D X54. Naval Architecture Software and IACS Rules
Naval architecture plugin for Rhinoceros providing hydrostatics, stability, and resistance calculations.
Orcades shipping route X57. Ocean Energy Beyond Wind
Historical shipping reference around Orkney relevant to EMEC and MeyGen marine traffic studies.
Orcaflex B1. Naval Architecture
Time-domain dynamic-analysis code for offshore systems.
Orcelle Wind X109. Maritime Autonomous Surface Ships and MASS Code
A Wallenius Wilhelmsen wind powered roll on roll off concept that envisages future unmanned operation.
ORCHESTRA (Inmarsat) X68. Maritime Satcom and Telecommunications
Inmarsat planned multi-orbit network combining GEO, LEO, and terrestrial 5G.
Orcina X54. Naval Architecture Software and IACS Rules
UK developer of OrcaFlex and OrcaLay specializing in offshore dynamic analysis.
Order X71. Shipbrokers and Brokerage Firms
Cargo or vessel inquiry circulated through brokers.
Order B/L X6. Container, Intermodal and Trade Codes
Negotiable bill of lading "to order" of a named party.
Order bill of lading C3. Logistics, freight forwarding and multimodal trade
BL consigned to order.
Order book C1. Commercial shipping, chartering, economics and finance
Total tonnage on order at shipyards.
Order Confirmation (Chandler) X120. Marine Catering, Provisions and Ship Chandlers
PO acknowledgment with line item pricing, validity typically 7 days from quote date.
Order of Battle (OB) E2. Naval, defence and maritime law enforcement
Composition and disposition of naval forces.
Order of Reference X51. Maritime Arbitration, Law and BIMCO Clauses
The procedural document constituting the tribunal and identifying the issues, used in some institutional rules.
Order to Berth X86. Port Agency, Husbandry and Disbursement
Authorization from port control to proceed to berth.
Order, Underwriter's X117. Marine Insurance Markets, Captives and Reinsurance
The Lloyd's instruction signing a risk and recording the line written.
Ordinary Leakage and Loss in Weight Exclusion X4. Marine Insurance, P&I and Claims
ICC clause 4.2 exclusion.
Ordinary Wear and Tear X51. Maritime Arbitration, Law and BIMCO Clauses
A non-actionable category of vessel deterioration excluded from charterer liability for redelivery condition.
Ore Barge X103. US Inland Waterway Towing and Barge
An open hopper barge used to carry iron ore or scrap.
Ore carrier (VLOC, Valemax) B5. Ship Types and Individual Vessels
Very large ore carrier 380,000-400,000 DWT.
Organic Peroxide X1. Cargo Science, Commodities and Cargo Care
IMDG Class 5.2; temperature-controlled stowage.
Organic Peroxide Type A X75. IMDG Code, Classes, Packing and Segregation
Type forbidden from transport in any packaging.
Organic Peroxide Type B X75. IMDG Code, Classes, Packing and Segregation
Allowed only in packagings up to 25 kg with safety devices.
Organic Peroxide Type C X75. IMDG Code, Classes, Packing and Segregation
Allowed in packagings up to 50 kg without explosion or detonation.
Organic Peroxide Type D X75. IMDG Code, Classes, Packing and Segregation
Allowed in IBCs subject to special provisions.
Organic Peroxide Type E X75. IMDG Code, Classes, Packing and Segregation
Suitable for IBCs and portable tanks under defined conditions.
Organic Peroxide Type F X75. IMDG Code, Classes, Packing and Segregation
May be transported in portable tanks when meeting acceptance criteria.
Organic Peroxide Type G X75. IMDG Code, Classes, Packing and Segregation
Not subject to Class 5.2 provisions but may still meet criteria of another class.
Organisational factors analysis X163. Marine Accident Investigation Agencies and Landmark Inquiries
Layer of investigation that examines management, procedures, training, and culture within shore-based and on-board organisations.
Organochlorine Pesticide Solid Toxic X75. IMDG Code, Classes, Packing and Segregation
UN 2761, Class 6.1.
Organophosphate antidote X36. Shipboard Medical, Telemedicine and Seafarer Health
Atropine plus pralidoxime per MFAG; relevant for pesticide cargo or fumigation.
Organotin X45. Marine Paints, Coatings and Antifouling
Family of organic tin compounds including TBT, banned for antifouling use under the AFS Convention.
Organotin compound X18. Ballast Water, Biofouling and Antifouling
Class of biocides including TBT, prohibited under the AFS Convention since 1 January 2008.
Orient and Pacific Mission X102. Seafarer Welfare and Maritime Charities
Historic name for several Anglican missions to seafarers in the Asia-Pacific region.
Orient Dredging X124. Dredging Industry and Reclamation Contractors
Hong Kong-based small contractor.
Orient Line X39. Pre-1900 Maritime History
British shipping company tracing its origins to the firm of James Thomson in 1797 and named for the Orient in 1878.
Orientation Arrows X75. IMDG Code, Classes, Packing and Segregation
Black or red arrows on two opposing vertical sides indicating upright orientation for liquid inner packagings.
Orifice tip X45. Marine Paints, Coatings and Antifouling
Nozzle of an airless spray gun, sized to control fan width and flow rate.
Origin X6. Container, Intermodal and Trade Codes
Country where goods are produced for tariff purposes.
Origin certificate X47. Marine Fuel Quality and ISO 8217
Document accompanying some bunker deliveries declaring the refinery or terminal source.
Origin Certificate (Meat) X120. Marine Catering, Provisions and Ship Chandlers
Required by EU and several other ports for chandler frozen meat deliveries.
Origin Refining X116. Global Bunker Anchorages, Hubs and Supply Infrastructure
New brand of UK Phillips 66 Humber Refinery bunker product.
Original bills of lading C1. Commercial shipping, chartering, economics and finance
Negotiable bills issued in a set of three originals.
Original of bearing X16. Nautical Science, Navigation and COLREGs
Time and value of a bearing as first observed.
Orinoco X124. Dredging Industry and Reclamation Contractors
Venezuelan river deepened for iron-ore export.
Orinoco Iron X124. Dredging Industry and Reclamation Contractors
Customer of pre-1999 Boskalis Orinoco river deepening.
Orion X105. Offshore Wind Farm Installation and Vessels
DEME Offshore heavy-lift installation vessel commissioned 2022 with a 5,000-tonne Liebherr crane for monopile and jacket installation.
Orion Belt Stars F5. The Reference Layer: Glossary, Units, Signals and Information Sources
Navigation reference stars used in celestial navigation.
Orkney X85. Ferries, Ro-Pax Operators and Routes
Scottish archipelago served by NorthLink Ferries and Pentland Ferries.
Orkney Islands Council X57. Ocean Energy Beyond Wind
Scottish local authority that hosts EMEC, the European Marine Energy Centre.
Orographic lifting X16. Nautical Science, Navigation and COLREGs
Rise of air over high ground producing cloud and rain.
Orolia Maritime X74. AIS Data, Vessel Tracking and Maritime Intelligence
Manufacturer of McMurdo branded AIS distress and tracking devices.
Oronasal Mask X82. Saturation Diving and Offshore Diving Operations
Inner mask within a helmet reducing CO2 dead space.
Oropesa sweep X77. Naval Mine Warfare and Mine Countermeasures
A classic mechanical sweep configuration using paired paravanes and otter boards towed from each quarter of a minesweeper.
ORP (Oxidation-Reduction Potential) X41. Cruise Ship Public Health and VSP/USPH
Electrochemical measure of disinfectant activity, with VSP recommending at least 650 mV for swimming pools and 700 mV for spas.
ORP (Ozone Depleting Substances) X118. Ship Recycling Yards, Beaches and Regulation
Refrigerants such as R-22 and Halon 1301 listed in IHM Part I and Annex 1 to HKC.
ORQ Chain X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral
Oil Rig Quality stud-link chain originally developed for offshore drilling rig moorings, predecessor of the R3 to R5 grades.
Orsted X42. Offshore Wind Installation and Cable Lay
Danish offshore wind developer operating Hornsea One and Two, Borssele 1 and 2, Race Bank, Walney Extension, and US East Coast projects.
Ortelius X97. Polar Expedition Cruise and IAATO Operations
Oceanwide Expeditions ice-strengthened ship with 116 PAX, formerly the Russian Marina Svetaeva.
Orthometric Height X129. Hydrographic Offices, Survey Vessels and Marine Cartography
Height above the geoid, derived from ellipsoidal GNSS height using a geoid model in vertical-datum workflows.
OS Category X135. Chemical Tanker Operators and IBC Code Cargoes
Other Substances, IBC Code designation for non-MARPOL-listed cargoes with no Annex II pollution category, carried under residual operational controls.
OS-NMA X25. Maritime Cybersecurity, OT and IT
Galileo Open Service Navigation Message Authentication for spoofing resistance.
OSA Marine propeller drive X38. Propellers, Stern Gear and Shaft Lines
Generic descriptor; omit unless verified product line.
OSC X12. Maritime Casualties and Investigation
On-Scene Coordinator designated under the IAMSAR Manual to lead SAR operations on site.
OSC Brief X80. Maritime Search and Rescue Coordination
Initial briefing issued by the OSC to arriving SRUs.
OSC Report X80. Maritime Search and Rescue Coordination
Periodic situation report from OSC to SMC.
OSCAR D1. Physical and chemical oceanography and marine meteorology
Ocean Surface Current Analyses Real-time product.
Oscar class X11. Naval Vessels, Warship Systems and Naval Architecture
Soviet Project 949A SSGN with 24 P-700 Granit missiles.
Oscar Flag F5. The Reference Layer: Glossary, Units, Signals and Information Sources
International Code of Signals letter O, meaning "Man overboard."
Oscar Wilde X85. Ferries, Ro-Pax Operators and Routes
Irish Ferries ro-pax name historically deployed on Rosslare to Cherbourg.
Oscar-II class X91. Submarines and Submarine Cable Systems
Russian Project 949A nuclear cruise missile submarine class, including K-141 Kursk.
Oscillating water column X57. Ocean Energy Beyond Wind
Wave energy converter type in which wave-induced air pressure changes drive a turbine, used in shoreline and floating designs.
Oscillating wave surge converter X57. Ocean Energy Beyond Wind
WEC type in which a flap pivots in nearshore waves, exemplified by the Oyster device.
OSD X63. Marine Auxiliary Machinery and Pumps
GEA Westfalia self-cleaning purifier series.
OSE X63. Marine Auxiliary Machinery and Pumps
GEA Westfalia self-cleaning lube oil separator series.
OSEA X119. Maritime Conferences, Trade Shows and Awards
Biennial Offshore South East Asia exhibition in Singapore since 1976, organized by Singex.
Oseberg Ship F1. Maritime History
Viking burial vessel found in Norway in 1904.
OSHA X82. Saturation Diving and Offshore Diving Operations
US Occupational Safety and Health Administration.
OSHA 29 CFR 1910.401 X82. Saturation Diving and Offshore Diving Operations
US federal commercial diving operations standard.
Oshima Shipbuilding X29. Ship Sale and Purchase, Management Contracts and Valuation
Japanese yard specializing in handysize and supramax bulkers.
OSI X123. Offshore Wind Installation Vessels and Operators
Offshore Substructure Installation, scope category typical for jacket and monopile installation EPCI contracts.
Oslo X85. Ferries, Ro-Pax Operators and Routes
Norwegian capital port hosting DFDS, Color Line, and Stena Line services to Copenhagen, Kiel, and Frederikshavn.
Oslo Bors X49. Ship Finance, Leasing and Maritime Capital Markets
Norwegian stock exchange home to multiple shipping equities and bonds.
Oslo Bors Euronext Growth X49. Ship Finance, Leasing and Maritime Capital Markets
Junior market segment of Oslo Bors used by smaller shipping issuers.
Oslo Chamber of Commerce X114. Maritime Arbitration and Shipping Law Firms
Norwegian institution administering occasional maritime arbitrations.
Oslo Conference 1948 X154. Maritime Welfare, Seafarer Charities, and MLC Rights
Founding conference of the ITF FOC campaign.
Oslo Maritime Cluster F3. Seafaring Life, Education, Professions and Institutions
Norwegian capital's maritime services hub.
Oslo Maritime Logistics School X121. Maritime Education, Academies and Universities
Norwegian Business School BI maritime logistics program.
OSM Thome Maritime Training X160. Maritime Academies, Universities, and STCW Certification
Joint OSM Thome ship management group training centers in Philippines, India, and Latvia for cadet and officer development.
Osmotic blister X165. Marine Coatings, Antifouling, and Hull Husbandry
Coating defect caused by soluble contaminants beneath the film attracting water and forming a fluid-filled dome.
OSPAR X10. Marine Biology, Fisheries and Oceanography
Convention for the Protection of the Marine Environment of the North-East Atlantic.
OSPAR Commission X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines
Mechanism for cooperation under the OSPAR Convention protecting the marine environment of the North-East Atlantic, relevant to cable and pipeline EIA.
OSPAR Convention D3. Marine environmental science, pollution and conservation
Convention for the Protection of the Marine Environment of the North-East Atlantic.
OSPF Over Satellite X68. Maritime Satcom and Telecommunications
Use of the OSPF routing protocol across satellite links with appropriate timer adjustments.
Osprey-class X77. Naval Mine Warfare and Mine Countermeasures
A class of twelve US Navy MHC-51 coastal minehunters of GRP construction, all decommissioned by 2007.
OSRL X13. Marine Salvage and Wreck Removal
Oil Spill Response Limited, industry-funded tier 3 responder based in Southampton.
OSRL Tier 3 X126. Marine Oil Spill Response and OPRC Regimes
Subsea Well Intervention Service (SWIS) toolkit including capping stack at Stavanger and Aberdeen.
OSRO X13. Marine Salvage and Wreck Removal
Oil Spill Response Organization classified by US Coast Guard under OPA 90.
OSRV X126. Marine Oil Spill Response and OPRC Regimes
Oil Spill Response Vessel, dedicated craft typically ABS A1 Oil Recovery class.
OST X42. Offshore Wind Installation and Cable Lay
Reference offshore stowage tool.
OST (Ocean Service Tug) X137. Harbour Tugs, Towage Operators and Tug Builders
Generic IMO-related term for a tug capable of unrestricted ocean service.
Ostansjo Varv X137. Harbour Tugs, Towage Operators and Tug Builders
Small Swedish builder of harbour tugs and workboats.
Ostfold University College Maritime Studies X121. Maritime Education, Academies and Universities
Norwegian small marine engineering program.
OSV X14. Offshore Oil and Gas Marine Operations
Offshore support vessel; umbrella term for AHTS, PSV, MPSV, etc.
OSV (Offshore Support Vessel) X34. Decarbonization, Alternative Fuels and Carbon Pricing
Vessel type with growing battery-hybrid and methanol uptake.
OSV Chemical Code X158. IMO Conventions, Protocols, Codes, and Resolutions
Code for the Transport and Handling of Hazardous and Noxious Liquid Substances in Bulk on Offshore Support Vessels, adopted by Resolution A.1122(30).
OSV Repair X113. Drydock and Ship Repair Yards
Drydock services for offshore support vessels including thruster overhauls, dynamic positioning recertification, and crane checks.
OT X107. Maritime Cybersecurity and OT Security
Operational Technology, the hardware and software that detects or causes a change through monitoring or control of physical devices and processes.
OT (Operational Technology) E1. Maritime security, geopolitics and risk
Shipboard control systems (engine, cargo, navigation).
OT Firewall X48. Maritime Cybersecurity
Firewall placed at the boundary between IT and OT zones, often with industrial protocol awareness.
OT Penetration Testing X48. Maritime Cybersecurity
Authorized testing conducted with extra safety constraints on shipboard or port operational technology systems.
OT vs IT X107. Maritime Cybersecurity and OT Security
Distinction between systems controlling physical processes aboard ship and systems supporting administrative or crew functions.
OT/IT Convergence E1. Maritime security, geopolitics and risk
Integration creating shared cyber attack surface.
OT/IT Segregation X22. Piracy, Maritime Security and Armed Protection
Network architecture separating operational technology from information technology systems.
OTAR (Over The Air Rekey) X68. Maritime Satcom and Telecommunications
Remote update of cryptographic keys on satellite terminals.
Otaru Canal District F2. Maritime Culture, Heritage, Archaeology, Art and Museums
Japanese port heritage area in Hokkaido.
OTC Distinguished Achievement Award X119. Maritime Conferences, Trade Shows and Awards
Annual award presented at the Offshore Technology Conference.
OTC FFA X44. Shipping Indices, FFAs and Freight Markets
Over-the-counter Forward Freight Agreement transacted bilaterally outside of central clearing.
OTC Houston Awards X119. Maritime Conferences, Trade Shows and Awards
Multiple category recognitions at OTC each May.
OTDR X122. Submarine Cable Laying, Repair Vessels and Operators
Optical Time Domain Reflectometer used for fiber fault localization in dark fiber pairs.
OTEC X57. Ocean Energy Beyond Wind
Ocean thermal energy conversion, a renewable power technology exploiting the temperature difference between warm surface and cold deep tropical seawater.
OTEC (Ocean Thermal Energy Conversion) E4. Cruise, offshore energy and auxiliary/specialised fleets
Renewable concept using ocean temperature gradients.