Merchant Mariner Credential (MMC) Information

    A Merchant Mariner Credential is a Passport style book issued by the
    US Coast Guard to  mariners that contains the mariner's professional
    credentials. These credentials are issued as three types of
    endorsements; Officer Endorsements, Rating Endorsements, and
    STCW Endorsements.

    Officer Endorsements include Captain's Licenses as Master, Mate
    and Operator of Uninspected Passenger Vessel (OUPV). These
    endorsements are required to operate commercial vessels on the
    federally navigable inland waters of the United States and on any
    ocean waters.

    Rating Endorsements include Ordinary Seaman and Able Seaman.
    These endorsements are required to work as a deckhand on most sea-
    going vessels greater than 100 GRT.

    STCW Endorsements are required on most seagoing vessels greater
    than 200 GRT. These endorsements are not required for  vessels
    operating exclusively on inland waters or for any vessel less than 200
    tons. These endorsements are required for all vessels operating on
    International voyages.

    The general requirements for officer endorsements is US citizenship
    (non-citizens may be issued an officer endorsement as OUPV limited to
    vessels of less than 5 tons) and a minimum age of 19 (some
    endorsements require the applicant to be 21 years old).

    Rating endorsements as AB and OS may be issued to US citizens and
    legal aliens 18 years old and older.

Captain's License MMC Endorsements in Brief

    The captain's license that you need is dependent on the size and type
    of vessel that you are operating. The following is an outline of the
    different captain's license endorsements that may be issued on an
    MMC.

  • Operator of Uninspected Passenger Vessel (OUPV) is the popular
    6-pack captain license held by most fishing guides. This license allows
    the mariner to operate small uninspected passenger vessels less than
    100 gross registered tons (GRT), which is about 65 feet, carrying six or
    fewer passengers for hire, not counting the crew or operator.

  • Master 100 tons or less is the license held by most charter boat
    captains or other small passenger vessels carrying more than six
    passengers for hire. This license may also be used to operate other
    small inspected vessels such as offshore supply vessels and crew-
    boats less than 100 GRT.

  • Master 200 tons or less is the license required operate inspected
    vessels greater than 100 GRT and less than 200 GRT. This is the
    license required to operate the uninspected 12-packs popular in SE
    Alaska. A 12-pack is an uninspected passenger vessels greater than
    100 GRT carry 12 or fewer passengers for hire, not counting the crew
    or operator.

  • Master of Towing is the license required to operate tugboats greater
    than 26 feet.


  • Master 500 / 1600 tons the license required to operate all types of
    inspected vessels greater than 200 GRT and less than 1600 GRT.
    These licenses require that the mariner have sea service experience
    on vessels greater than 50 tons and hold an endorsement as Able
    Seaman.

  • Master Unlimited is the license required to operate all types of
    inspected vessels greater than 1600 GRT. To qualify for this license
    the mariner must first qualify for and sail as a Third Mate Unlimited. All
    the sea service requirements for Unlimited tonnage licenses must have
    been on vessels greater than 1600 GRT.

    The requirements for MMC Officer endorsements are contained in
    Code of Federal Regulations (CFR), Title 46 Shipping, Part 11
    Requirements for Officer Endorsements; they may be accessed online
    at www.ecfr.gov.

    This website contains CFR references for the Captain's licenses that
    the USCG allows third party testing for: which includes OUPV; Master
    and Mate 200 tons and less; Master, Mate and Apprentice Mate
    (steersman) of Towing vessels; and Master or Mate of Fishing Industry
    Vessels.
Welcome to my website about professional Captain's Licenses!

    On this website you will find information on the requirements for the
    USCG issued Merchant Mariner Credential Captain's Licenses for
    fishing guides, charter boats, passenger vessels, crew-boats, fishing
    industry vessels and tugboats.

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