Certification: National Master Unlimited OC or NC

100 Forbes Drive Martinsburg, WV 25404-7120

Master of Unlimited Tonnage. This is an advanced-level merchant mariner credential. The general requirements for this credential are TWIC Card (Identification, Fingerprints, Citizenship, Social Security number, etc), CG-719B Application, NDR Consent & Check, Oath, 3 letters of recommendation, photograph (supplied by TSA), SSEB Screening complete, age of 21 or over, CG-719K Physical Exam, Medical Tab in MMLD, Drug Testing Compliance, Mariner Fees, and Sea Service Letters or Discharges. Sea service requirements include recency- 90 days in the past 3 years on vessels of appropriate tonnage. Master, 360 days of service as Chief Mate on Ocean/NC steam or motor vessels; or 360 days of service, while holding an endorsement as Chief Mate Ocean or Near Coastal, of which 180 days of service as Chief Mate on Ocean or Near Coastal waters, and service as OICNW accepted on a 2 for 1 basis for a maximum of 180 days. There are also tonnage requirements. Other requirements include completing a Basic Safety Training; or Continued Competency in BST, Flashing Light- course, and a valid, approved radar observer course. All candidates must complete an examination.

More than two years of education or training after high school required?
More than two years of work experience required?
Oral or Written Exam Required?
Renewal Required?
Every 5 Year(s)
Renew through Continuing Educational Units(CEU)?
Renew through Re-Examination?
Renew through Continuing Professional Development(CPD)?
Does applicant have choice of at least two options from above for renewal (CEU, CPD, or exam)?


Your local Regional Exam Centers external site(REC) provide valuable resources toward obtaining a Merchant Mariner Credential (MMC).


The certification has an education level of an Associates of Arts or Associates of Sciences degree or higher and has a work experience requirement of more than 2 years, or requires obtaining a ‘core’ level certification from the same organization.

  • This certification is related to military occupational specialties.