What is a Merchant Mariners Credential or MMC?
All mariners employed aboard U.S. merchant vessels greater than 200 Gross Register Tons (Domestic Tonnage), except operators of uninspected passenger vessels, are required to have a valid U.S. Merchant Mariners Credential (MMC). A MMC is not a guarantee of finding work, but rather a certification allowing you to work in the shipboard merchant marine industry.