Merchant Mariner Credential

The Merchant Mariner Credential (MMC) is a credential issued by the United States Coast Guard in accordance with guidelines of the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) to United States seafarers in order to show evidence of a mariner's qualifications[1]. It will become the standard documentation required for all crew members of U.S. ships with a Gross Tonnage of over 100 and for all vessels required to operate with a licensed Master, regardless of size. As previously issued but still valid credentials expire, the MMC will replace the Merchant Mariner's Document, merchant mariner license, Certificate of Registry, and STCW Certificate.

The MMC contains professional qualification information previously listed on a merchant mariner license or Certificate of Registry as an officer endorsement, while information previously listed on a Merchant Mariner's Document would be included as a rating endorsement. STCW endorsements would still be listed as STCW endorsements.

The combining of the mariner credentials was due to the recent requirement for U.S. mariners to obtain the Transportation Worker Identification Credential (or TWIC), a biometric security card issued by the Transportation Security Administration (TSA) that all workers in the transportation industry are required to obtain if their work involves access to a security-sensitive area. This reduces the number of documents needed to satisfy manning requirements from five to two: The TWIC and MMC.

Newly accredited US mariners receive the MMC credential; those already accredited receive the new credential when their current document or license expires. The credential is obtained by applying by mail or in person to any of the 17 United States Coast Guard Regional Examination Centers (REC) in the United States.

Previous to April 15, 2009, applications for credentials still had to be made in person at an REC to provide fingerprints and proof of identity. Now, TSA collects the fingerprints and proof of identity and forwards the information to the Coast Guard's National Maritime Center (NMC). Mariners have to visit a Regional Exam Center if they are required to take an exam.

The first Merchant Mariner Credential was issued on May 7, 2009, at a meeting of the Towing Safety Advisory Committee.[2]

The new credential has been criticized by several groups. One organization says that the consolidation reduces the merchant marine officer license, a certificate of professional achievement and status, into a work permit.[3] Another group suggests that the consolidation, together with STCW requirements, the coming TWIC requirement, and new physical evaluation standards, have stressed the skilled labor pool, pose too much of an administrative burden, and threaten mariner recruitment, training and retention.[4]

Physical description

The MMC is in the format of a traditional passport book. Like a passport, the cover is imprinted with the Great Seal of the United States and the text United States of America. Unlike a passport, the cover is red-maroon in color (rather than the four colors used for US passports or travel documents: dark blue, black, brown, and blue-green) and the text Merchant Mariner Credential appears in place of Passport. Also, the cover does not hold a contactless smart card chip as do newer biometric passports (ePassport).

The MMC has twenty pages, exclusive of the front and back covers, sequentially numbered like the visa pages of a passport. Basic identity document data is page 3. The MMC is not a passport, but it is a Seafarer's Identity Document and the format of the data page complies with the ICAO Machine Readable Travel Documents specifications for machine-readable passports.[5] Rather than the document type of P used with US government issued passports, a document type [6] of PG is used for MMCs.[7]

License information in the form of domestic and international endorsements begin on page 4 of the MMC and continue as many pages required to list competencies held by the mariner. Domestic (46 CFR 10) and International (STCW Convention) license information are printed on separate pages. When the mariner gain a new competency while holding an already valid MMC, the new competency is printed on a sticker which is placed on the next available blank page in the MMC, much like a visa in a passport. Thus new MMCs are only produced for original and renewals; raises in grade, removal or limitations, or addition of endorsements do not require a new credential.

The mariner's reference number and the MMC's serial number are printed on the bottom of every page containing endorsement information and on all stickers issued to be added. The endorsement pages are overprinted with a transparent plastic 'watermark' with the words 'Merchant Mariner Credential' and the seal of the United States.

MMC serial numbers are nine digits long, as required for a passport book, and padded with leading zeros.

The MMC has a clear plastic holder for the mariner's TWIC card on the inside of the back cover.

The MMC is considered a form of REAL ID and is therefore accepted as proof of identity by the TSA.[8]

See also


  1. What is a Merchant Mariner Credential (MMC)?
  2. "Coast Guard issues first consolidated Merchant Mariner Credential". 2009-05-07. Retrieved 2010-04-14.
  5. ICAO Doc 9303 Archived 2012-01-07 at the Wayback Machine.
  6. The field labeled as Type on US documents is formally defined as the Document Code by ICAO Doc 9303, Vol 1.
  7. This is specifically discussed in ICAO Document 9303 Vol I, section 9.7, note m, p. IV-17. The ICAO requires the first character of the document code to be P but allows governments to add a second character to the document code. The US Coast Guard uses G for MMCs.
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