How often must a mariner renew their MMC?

Mariners are required to renew their Merchant Mariner Credential (MMC) every five years, unless there are specific circumstances that dictate otherwise. This renewal process ensures that mariners maintain their qualifications and are up-to-date with regulations, safety standards, and training necessary for their roles at sea. It is important for mariners to keep track of when their MMC is due for renewal to avoid any disruptions in their ability to work. The five-year renewal interval provides a comprehensive timeframe for mariners to engage in professional development and to stay aligned with any changes in maritime law or technology.