USCG-ENG-SEA-L4.2
The 6-pack is a deck ticket
USCG-ENG-SEA-M4 · The Yacht · USCG-ENG-SEA-M4-A GRT, GT, the 6-pack myth, and the honest position.
Ask around a US dock about licences and somebody will mention the 6-pack inside a minute. It is the best-known credential in American boating, and for an engineer it is a **dead end** — not because it is a bad ticket, but because it answers a different question.
AI-drafted catalogue content pending SME review. Sea service crediting and manning requirements change, and enforcement practice on recreational vessels was not confirmed from primary sources; verify with the National Maritime Center and the cognizant OCMI before relying on this for a career decision.