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Merchant Mariner Credential Verification


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Merchant Mariner Credential Verification
  • GENERAL: This tool is intended for Port State Control Officers, employers and others who wish to verify the validity of a United States Merchant Mariner Credential (MMC) and Medical Certificate. This tool displays only the most recently issued valid MMC and Medical Certificate. Data viewed on this site is updated daily at 0700.
  • Medical Certificates:
    • DATES: Medical Certificates display the certificate issue and expiration dates for service under National, STCW and/or First Class Pilot Endorsements. For example, if the mariner is sailing under STCW, then the expiration date displayed for STCW applies. If the STCW and Pilot expiration dates are past but the National date is still valid, the mariner may continue to sail under the authority of their National Endorsement(s) until a new Medical Certificate has been issued.
    • REQUIREMENT TO CARRY: All credentialed U.S. Mariners who have been issued a medical certificate must carry both a valid MMC and Medical Certificate to sail under the authority of their MMC. All mariners holding STCW Endorsements should currently hold a Medical Certificate and in all cases are required to have a valid Medical Certificate to sail under the authority of their STCW Endorsement by January 1, 2017. All credentialed U.S. Mariners must have a valid Medical Certificate by March 24, 2019 in order to sail under the authority of their MMC.
  • EMPLOYERS: It is recommended you visually verify original credentials before offering employment based on this tool.
  • HOW TO VERIFY: : There are three methodologies available, via the drop down menu below, to enter the system:
    • Enter the document number and credential type.
    • Enter the reference number and last name of the mariner(s).
    • Enter the last name, date of birth and last 4 digits of the social security number of the mariner(s).
  • NEED MORE HELP:
    • If you have any questions or concerns about the data you receive, please contact the National Maritime Center at iasknmc@uscg.mil ,
      1-888-IASKNMC (domestic US calls only) or, from outside the U.S. (your country’s exit code)-1-304-433-3400.
    • Additional information regarding U.S. Merchant Mariner Credentials can be found at http://www.uscg.mil/nmc/.
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