unattended machinery spaces (UMS) aboard them, the number of seafaring engine officers has decreased drastically on board merchant ships. Today, the engine department usually consists of the following number of engine officers and ratings: (1) Chief engineer (1) Second engineer (1) Third engineer (1-2) Fourth engineer (0-1) Engine Cadet (2-4) Motorman (0-2) Oiler (0-1) Wiper Additionally, many vessels also carry a specific type of engine officer known as an electro-technical officer. See also Engine officer Engine room List of maritime colleges Marine fuel management Seafarer's professions and ranks Society of Naval Architects and Marine Engineers References Marine occupations Merchant navy Maritime safety