A Merchant Mariner Credential (MMC) is issued by the US Coast Guard and is required to work aboard commercial vessels in US waters. The MMC combines the former Merchant Mariner's Document (MMD), license, and Certificate of Registry into a single credential.
10 steps across 1 sections
1. Steps Process
- Obtain a TWIC card — Apply for a Transportation Worker Identification Credential through TSA at a Universal Enrollment Center. The TWIC requires a background check, fingerprinting, and costs $125.2...
- Determine the credential you need — Entry-level ratings (Ordinary Seaman, Wiper, Steward's Department) require minimal sea service. Licensed officer positions (Mate, Master, Engineer) require exten...
- Complete a DOT physical examination — Pass a physical performed by a designated medical examiner. The exam evaluates vision, hearing, general health, and physical ability to perform duties at sea.
- Pass drug screening — All MMC applicants must pass a drug test for prohibited substances. This is mandatory regardless of credential level.
- Complete required training — All mariners must complete basic safety training courses: Basic Safety Training (BST), which includes Personal Survival, Fire Prevention, Elementary First Aid, and Pers...
- Document sea service (if required) — For ratings beyond entry-level, you need documented sea time. Collect discharge papers, sea service letters, or History of Assignments (HOA) from previous emplo...
- Pass Coast Guard exams (for licensed positions) — Licensed officer positions require passing Coast Guard-administered written examinations covering navigation, seamanship, rules of the road, safety...
- Submit your MMC application — Apply through the NMC website or at one of 17 Regional Examination Centers (RECs). Submit all documentation: TWIC receipt, medical certificate, drug test results, trai...
- Coast Guard evaluation — The NMC's Mariner Evaluation Division reviews your application. Processing can take several weeks to months depending on completeness and complexity.
- Receive your MMC — Once approved, your MMC is mailed to you. The credential lists all endorsements and authorized capacities.
Common Mistakes
- Submitting an incomplete application
- Not obtaining TWIC first
- Expired medical certificates
- Inaccurate sea service documentation
- Missing renewal deadlines
Pro Tips
- The Coast Guard's NMC has an online application tracking system
- Maritime academies (state maritime academies, US Merchant Marine Academy) pro...
- Military veterans can leverage military sea service for MMC credentials
- STCW (Standards of Training, Certification and Watchkeeping) certification is...
- Maritime unions (SIU, MM&P, MEBA) provide training, job placement, and career...