noun
marine engine
Technical term for engines used on ships, including main propulsion and auxiliary machinery.
この船は最新の舶用機関を搭載している。
This ship is equipped with the latest marine engine.
Similar meaning, but 舶用機関 is more specifically 'marine engine' as a technical category, while 船舶機関 can refer to ship machinery in general.
Compound of 舶用 (marine use) and 機関 (engine). The exact historical derivation is uncertain, but the term is a modern technical coinage.