Motorman (Моторист) / OS (Вахтенный матрос) / Third Engineer (Третий механик)

Deck Cadet, OS

Third Engineer

Motorman, Motorman / Electrician, Motorman-electrician, Motorman-welder, Oiler, Rating forming part of a watch in a manned engine-room or designated to perform duties in a periodically unmanned engine-room

OS