Rules of the Road · Application & Demarcation Lines
A vessel transiting from the open ocean across the COLREGS Demarcation Line into a harbor must:
- ASwitch from 72 COLREGS to U.S. Inland Rules at the demarcation line✓ Correct
- BContinue using 72 COLREGS until anchored
- CApply Great Lakes Rules inside the harbor
- DRequest a waiver from the Coast Guard before switching rules
Explanation
The moment a vessel crosses the COLREGS Demarcation Line from seaward to the harbor side, 72 COLREGS no longer apply and the U.S. Inland Navigation Rules govern. No waiver or notification is required.
Authority: 33 CFR Part 80; Inland Rule 1(a)
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