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Chief Engineer, Chief engineer officer on ships powered by main propulsion machinery of 3,000 kW propulsion power or more

OS

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, Motorman

ETO

OS

Master on ships of 3,000 gross tonnage or more

Junior officer, Third Officer

Officer in charge of a navigational watch on ships of 500 gross tonnage or more

Second Officer