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Encyclopedia of Marine Technology


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Abbreviation for a combination carrier designed to carry oil, bulk cargoes or ore cargoes.

Ocean area coverage

Area A1: Covered by VHF coast radio stations providing digital selective calling (DSC) alerting services (typically 20 NM from the coast).

Ocean areas

Navigation area beyond the outer limits of coastal waters where freedom of course-setting is not restricted in any direction for a distance equivalent to 30 minutes of sailing at the relevant ship speed.

Oceanographic research vessel RRS JAMES COOK

31 August, 2006, the Natural Environment Research Council (NERC) took delivery of the newest addition to their research vessel fleet, the RRS JAMES COOK.

Octopus Onboard system

A modular decision support system developed by Amarcon BV for avoiding dangerous situations in adverse weather and sea conditions.


One of the certificated members of the ship staff who under the master authority assist him in navigation and operation of the vessel.

Officer of the watch, navigator

The person responsible for safe navigating, operating of the bridge equipment and manoeuvring of the ship.

Offset table

A booklet containing measurements, which are, taken from a faired lines plan to give the coordinates according to which the curved lines representing the hull must be drawn.


A term used for the co-ordinates of a ship form, deck heights, etc.


Industrial activity at sea, e.g. drilling and pumping at an oil or gas well.

Offshore Construction and Anchor Handling Vessel NORMAND INSTALLER

Designed by Wärtsilä Ship Design, an offshore construction vessel NORMAND INSTALLER was built in 2006 by Ulstein for the Norwegian offshore company Solstad Offshore ASA and the Swiss-based company Single Buoy Moorings Inc (SBM).


Depending of water depths, fixed or floating installations are used for offshore oil and gas production.


During the past decades the offshore oil and gas industries have expanded tremendously, which has led to ever increasing demand for offshore support vessels (OSVs)...

Offshore unit

Any floating offshore structure (including vessels and barges), designed for operating afloat or supported by seabed.


Petroleum in any form including crude oil, sludge, oil refuse and refined products.

Oil clearance, oil recovery

An operation of removing oil from the water surface.

Oil Companies International Marine Forum (OCIMF)

The OCIMF is a voluntary association of oil companies interested in shipment and storage of crude oil and oil products. 27 Queen Anne’ s Gate, London SW1H 9BU, homepage:www.ocimf.com

Oil distribution shaft

It is a hollow propulsion shaft with the bore and radial holes used for distribution of hydraulic oil in controllable pitch propeller installations.

Oil Pollution Act (OPA)

The American rules on the safety of transport of hydrocarbons by sea. Provisions apply to tanker structure, with the requirement that new tankers should be built with a double hull or other similar design.

Oil Record Book

The document required to be carried on board ships by MARPOL 73/78, Annex I, reg. 20.

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