USCG-DECK-SEA-L3.1

GRT, GT and the deck officer's tonnage

USCG-DECK-SEA-M3 · Tonnage · USCG-DECK-SEA-M3-A GRT versus GT for deck credit, the 25/50 formula below 200 GRT and tonnage conditions up to unlimited. 3 lessons.

National deck endorsements are written in **GRT**; STCW endorsements in **GT**; many large yachts carry **GT only**. 11.211(h) is the bridge between them.

AI-drafted catalogue content pending SME review. Deck sea service credit for yacht, foreign-flag and recreational service is largely evaluator discretion, including 12-hour days, days alongside and GT-only tonnage; verify with the National Maritime Center before relying on any day count.