USCG-ENG-SEA-L4.1
GRT is not GT
USCG-ENG-SEA-M4 · The Yacht · USCG-ENG-SEA-M4-A GRT, GT, the 6-pack myth, and the honest position.
There are two tonnage systems in play on a US-flagged yacht, and they produce two different numbers for the same hull.
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.