Said of a vessel when she is passing or overtaking another vessel.Must Read: Rule 13: Overtaking … [Read more...]
Overdue
A situation where a craft has failed to arrive at its intended destination when expected and remains missing. … [Read more...]
Outboard
Towards the sides of the vessel (with reference to the centerline). … [Read more...]
Ordinary seaman (OS)
The beginning grade for members of the deck department. The next step is able bodied seaman. … [Read more...]
On Board Quantity
The material remaining in vessel tanks, void spaces, and/or pipelines prior to loading. Onboard quantity includes water, oil, slops, oil residue, oil/water emulsions, sludge, and sediment. … [Read more...]
Officer of the watch (OOW)
The officer in charge of the watch. … [Read more...]
OCIMF
The oil companies’ international marine forum is an organization of oil companies that own or operate ships. … [Read more...]
oceanic gyre
A very large, more or less circular, pattern of water circulation in an open ocean basin. … [Read more...]
Ocean Region
The coverage area of an Inmarsat satellite within which an SES may send and receive messages. … [Read more...]
Oil tanker
a ship constructed or adapted primarily to carry oil in bulk in its cargo spaces and includes combination carriers and any ‘chemical tanker’ as defined by Annex II of MARPOL, when it is carrying a cargo or part cargo of oil in bulk. … [Read more...]