A transverse propulsion device installed in a tunnel through the bow of a vessel, used to improve manoeuvrability at low speeds during berthing and unberthing operations. Bow thrusters can be electric or hydraulically driven and produce lateral thrust to push the bow sideways without the need for tug assistance.
Category: Marine Engineering
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Auxiliary EngineA secondary diesel engine on board a vessel used primarily to drive electrical generators that supply power for the ship's hotel load, cargo-handling equipment, navigation systems, and other onboard services.Ballast Water TreatmentSystems installed on vessels to treat ballast water before it is discharged overboard, removing or neutralising harmful aquatic organisms and pathogens.CIICarbon Intensity Indicator, an operational measure introduced by the IMO that rates a ship's annual carbon emissions relative to the cargo carried and distance sailed.Dual FuelAn engine technology that allows a marine engine to operate on two different types of fuel, typically LNG and conventional marine diesel or heavy fuel oil.EEXIEnergy Efficiency Existing Ship Index, a measure introduced by the IMO to reduce the carbon intensity of existing ships by requiring them to meet a minimum energy efficiency standard.Four-Stroke EngineA type of internal combustion engine that completes a power cycle in four strokes of the piston (two revolutions of the crankshaft).
Back to DictionaryEntry updated May 2026