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O/B on board
OBO Ore/Bulk/Oil Vessel
OBO SHIP A multipurpose ship that can carry ore, heavy dry bulk goods and oil. Although more expensive to build, they ultimately are more economical because they can make return journeys with cargo rather than empty as single-purpose ships often must.
OCEAN WAYBILL A document, issued by a shipping line to a shipper which serves as a receipt for the goods and evidence of the contract carriage.
OCIMF Oil Companies International Marine Forum
OCR optical character recognition
ODS Operating Differential Subsidy: A direct subsidy paid to U.S.-flag operators to offset the high operating cost of U.S.-flag ships when compared to foreign-flag counterparts.
OECD Organization for Economic Cooperation and Development. the Maritime transport Committee is part of this organization.
OFF-HIRE CLAUSE in a Time charter, the owner is entitled to a limited Time for his vessel to be off hire until such Time as the vessel may be repaired or dry-docked.
OFFICER Any of the licensed members of the ship's complement.
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OFF-LOAD Discharge of cargo from a ship.
OIL RECORD BOOK a book or log kept by the Master of An oil tanker wherein every discharge or escape of oil is recorded.
OIL TANKER a ship designed for the carriage of oil in Bulk, her cargo space consisting of several or many tanks. tankers load their cargo by gravity from the shore or by shore pumps and discharge using their own pumps.
OILER An unlicensed member of the engine room staff who oils and greases bearings and moving parts of the main engine and auxiliaries. Most of this work is now done automatically and the oiler merely insures it operates correctly.
OMBO One man Bridge Operation
OO Owners Option
OOD officer of the deck
OOW officer of the watch
OPA 90 Oil Pollution Act of 1990 (USA)
Opec Organisation of Petroleum Exporting Countries
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OPEN RATES Pricing systems that are flexible and not subject to conference approval. Usually applied to products in which tramps are substituted for liners.
OPEN REGISTRY A term used in place of "flag of convenience" or "flag of necessity" to denote registry in a country which offers favorable tax, regulatory, and other incentives to ship owners from other nations.
OPPR oil pollution preparedness and response
OPRC International Convention on Oil Pollution Preparedness,Response and Co-operation, IMO
ORDINARY SEAMAN (OS) An apprentice AB, assists AB's bosun, and officers, keeps facilities clean.
ORE CARRIER a large ship designed to be used for the carnage of ore. because of the high density of ore, ore carriers have a relatively high center of gravity to prevent them being still when at Sea, that is, rolling heavily with possible stress to the hull.
ORE-BULK-OIL CARRIER a large multi-purpose ship designed to carry cargoes wither of ore or other Bulk commodities or oil so as to reduce the Time the ship would be in ballast if restricted to one type of commodity. this type of ship is Sometimes called Bulk-oil carrier.
ORE-OIL CARRIER A ship designed to carry either ore or oil in bulk.
OSH Open Shelter Deck
OSV Offshore Support Vessel
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OUARTERMASTER/HELMSMAN An able-bodied seamen entrusted with the steering of a vessel.
OUTBOARD Toward or beyond the boat's sides. A detachable engine mounted on a boat's stern.
Outhaul the line that adjust tension along the foot of the sail along the boom
OVERBOARD Over the side or out of the ship
OVERTONNAGING A situation where there are too many ships generally or in a particular trade for the level of available cargoes.
OWS Owners
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