Revised Rules and Mandatory Minimum Requirements in the Issuance and Revalidation of Certificate of Competency (COC) for Chief Engineer Officers, Second Engineer Officers, Officers in Charge of an Engineering Watch in a Manned Engine-Room or Designated Duty Engineer Officer in a Periodically Unmanned Engine-Room and Electro-Technical Officers Serving on Seagoing Ships Powered by Main Propulsion Machinery of 750 kW Propulsion Power or more under Chapter III of the STCW Convention, 1978, as amended.