Oakum - Untwisted fibers of old rope treated with a composition of resin and pitch, used to fill seams of wooden decks.
Category: - Maritime

OBO - 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.
Category: - Maritime - Acronym

OBS - Office of Boating Safety, Canadian Coast Guard
Category: - Maritime - Acronym

Office of Boating Safety - Office of Boating Safety, Canadian Coast Guard
Category: - Maritime

Off-Load - Discharge of cargo from a ship.
Category: - Maritime

OIC - Officer in Charge
Category: - Maritime

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.
Category: - Maritime

Oil Record Book - A book or log kept by the master of an oil tanker wherein every discharge or escape of oil is recorded.
Category: - Maritime

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.
Category: - Maritime

Oil Tight - Sealed by welding or caulking to prevent oil leakage.
Category: - Maritime