AB Seaman (Квалифицированный матрос) / Motorman (Моторист) / OS (Вахтенный матрос) / Seamen (Матрос)

4th Engineer, Motorman, AB / Motorman, Officer in charge of an engineering watch in a manned engine-room or as designated duty engineer in a periodically unmanned engine-room on ships powered by main propulsion machinery of 750 kW propulsion power or more

OS

OS

OS, Junior officer, Officer in charge of a navigational watch on ships of 500 gross tonnage or more