Revised Rules and Mandatory Minimum Requirements in the Issuance and Revalidation of Certificate of Competency (COC) for Masters, Chief Mates, and Officers in Charge of a Navigational Watch on Seagoing Ships of 500 Gross Tonnage of more under Chapter II and for Global Maritime Distress and Safety System (GMDSS) Radio Operators on Ships Required to Participate in the GMDSS under Chapter IV of the STCW Convention, 1978, as amended.