Q. Get a Merchant Mariner's License
For information on getting licensed as a merchant mariner, see the Coast Guard's National Maritime Center.
You can find information on renewing a U.S. Merchant Mariner credential (Merchant Mariner Document, License, or Certificate of Registry) as well as check your application status at the above site
For more information, contact the Coast Guard's National Maritime Center online or call 1-888-427-5662