Occasionally mariners and employers have difficulty deciphering the Merchant Mariner’s Credential. Many of the endorsements are indicated by letter and Roman numeral, without supportive definition.
The US Merchant Marine Credential has two parts. One describes the authority of the holder based on US licensing regulations. This is the “National” credential. The second part, omitted on credentials for mariners who do not need it, is the STCW authority. Here is a key to translating the STCW endorsement with links to the appropriate Checklists.