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The oiler is one of the rated technicians in the engine department of a Merchant Marine ship. Often, the endorsement is paired with the fireman/watertender rating. It is used as one of the key steps en route to licensing as a third assistant engineer, the most junior of officers in the engine department and the first step on the path to chief engineer.
Credential and Endorsement
You must hold a U.S. Merchant Mariner credential with an endorsement as a Qualified Member of the Engine Department, a QMED.
You must have taken the appropriate training in the maintenance and operation of boilers and marine diesel engines. Examinations are waived for those completing a U.S. Coast Guard-approved course.
You are required to have attended a class in basic and advanced firefighting offered by a school recognized by the U.S. Coast Guard as qualified to administer that training.
You must have a qualification under the Standards for Training and Certification of Watchkeepers (STCW-95 endorsement).
Upon successful completion of an approved course and presentation of proof to a Coast Guard Regional Examination Center, your credential will be endorsed as QMED, Oiler.