Key to Engine Ratings

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.

Symbol Certificate
III/4 Ratings Forming Part of an Engineering Watch
III/5 Able Seafarer Engine
III/7 Electro-Technical Rating 1000 HP or more
IV/2 GMDSS At-Sea Maintainer
VI/1 Basic Training (formerly Basic Safety Training)
VI/2 Proficiency: Survival Craft & Rescue Boats (except Fast Rescue Boats)
Proficiency: other than fast rescue boats
Proficiency: Survival Craft (Limited)
Proficiency: Fast Rescue Boats
VI/3 Advanced Firefighting
VI/5 Vessel Security Officer
VI/6 Vessel Personnel with Designated Security Duties