USCG-ROR-L1.2

The COLREGS Demarcation Lines (33 CFR Part 80)

USCG-ROR-M1 · Where the Inland Rules apply · USCG-ROR-M1-A Two rulebooks, the demarcation lines that divide them and the definitions that differ.

The line on the chart that switches the rulebook. **Not** the same as the boundary line that drives your credential and STCW.

AI-drafted catalogue content pending SME review. The Rules of the Road examination is the one module where a near miss fails you, and module assignments and pass marks are set by NMC examination policy rather than regulation; verify with the National Maritime Center before booking an exam or relying on any figure here.