Credential guide

Make Merchant Mariner Credential information easier to manage.

Your MMC can include a document number, endorsements, limitations, and expiration details. Keep those records structured so you know what needs attention.

Start your MMC record

Organize the essentials

Save clear document images and your MMC document number.
Record the issue and expiration dates shown on the credential.
Review endorsements and limitations as part of maintaining your work-readiness records.

Important: Vessel Masters helps organize your records; it does not issue, renew, or determine the validity of a Merchant Mariner Credential. Confirm requirements with the U.S. Coast Guard or the applicable authority.