Before revision: A sample United States Merchant Marine license issued by the United States Coast Guard in 2006 A licensed mariner is a sailor who holds a license from a country's maritime authority to hold senior officer-level positions aboard ships, boats, and similar vessels.
After revision: Mariners ( Captain, first officer and second officer ) at the controls of the Kristina ReginaA sample United States Merchant Marine license issued by the United States Coast Guard in 2006 A licensed mariner is a sailor who holds a license from a country's maritime authority to hold senior officer-level positions aboard ships, boats, and similar vessels.