The U.S. Coast Guard’s National Maritime Center oversees all official licensing of those employed aboard vessels traveling in national waters. Mariners may seek licenses with formal training, coursework and hands-on experience.The U.S. Coast Guard offers a wide range of licenses and endorsements based on an applicant’s qualifications, nationality, vessel size (gross tonnage), and waters upon which he or she will operate. All licenses, endorsements and other credentials can be located within...