on board. Depending on usage, "the Second" or "the Third" is also typically in charge of fueling (a.k.a. bunkering), granted the officer holds a valid Person In Charge (PIC) endorsement for fuel transfer operations. Fourth engineer The fourth engineer or third assistant engineer is junior to the second assistant engineer/third engineer in the engine department. Traine Marine Engineer Traine Marine Engineer or Engine cadet is a trainee who is trained by SEO or CEO of the Engine Department. Engine ratings / unlicensed Motorman The motorman is an unlicensed member of the engine department, same requirement with the oiler both having the Able Seafarer Engine Certificate STCW A-III/5. Oiler The oiler is an unlicensed member of the engine department, with more experience than a wiper and having the Able Seafarer Engine Certificate STCW A-III/5. Wiper The wiper is an unlicensed member of the engine department, usually with the least experience and having the Engine Room Watch Rating (ERWR) Certificate STCW A-III/4. Electro-technical department Electro-technical officer The electro-technical officer sometimes referred to as the electrical engineer is in charge of all the electrical systems on the ship. The electrical engineer is one of the most vital positions in the technical hierarchy of a ship and engineer is responsible for their assigned work under the chief engineer's instructions. Unlike engineers, the ETO does not carry out an assigned engine room watch. Instead, he is normally on call 24 hours a day and generally works a daily shift carrying out electrical and electronic maintenance, repairs, installations, and testing. Some shipping companies do not carry electrical officers on their ship to cut down the manning cost, and the electrical duties are carried by an engineer. This is usually the third engineer. However, many companies realized that electrical and electronic system requires some extra attention and therefore require an expert to attend them. This is especially true on diesel electric ships or vessels equipped with systems such as dynamic positioning. On larger vessels such as cruise ships, electro-technical officers can have ranks within their profession, such position names include, lead ETO, 1st electrician, chief electrical officer or chief electrical engineer. In this situation, the highest ranked electro-technical officer will report directly to the chief engineer. On special class ships such as FPSOs, the electro-technical officer can sometimes earn nearly the same wage as a chief engineer due to the complexity of the electrical systems on the