Officer on a mechanically propelled vessel charged with maintenance and efficient operation of main engines and, usually, all powered machinery on board
NFPA 1005 Standard for Professional Qualifications for Marine Fire Fighting for Land-Based Fire Fighters, 2007 ed. http://www.nfpa.org/assets/files/aboutthecodes/100 5/pqu-ffq_firstdraftagenda_03-12.pdf, (Std: Prof Qualf for Mrn Fr Fight for Land-Based Fr Fightr - Amer) {363 NFC}