AB / Welder (Матрос-сварщик) / AB Seaman (Квалифицированный матрос) / Second Officer (Второй помощник)

Officer in charge of a navigational watch on ships of 500 gross tonnage or more, Officer on watch (OOW), Second Officer

AB / Welder, AB Seaman, Boatswain / Bosun, Bosun (boatswain) – welder, OS

Second Officer, Third Officer