USCG-MASTER100-L1.2
The tonnage formula: how 25, 50 and 100 are decided
USCG-MASTER100-M1 · The credential · USCG-MASTER100-M1-A What Master under 100 GRT authorises, the tonnage formula, routes, sea service and the examination.
There is no such thing as a "Master 50 Ton licence" you apply for. There is one credential — Master of vessels less than 100 GRT — and a **formula** that decides what tonnage it is limited to. You do not choose the tier. Your logbook chooses it for you, years before you apply.
AI-drafted catalogue content pending SME review. USCG requirements change; verify every figure against the National Maritime Center and the current CFR before relying on it for an application.