Inland · Rule 1
Application
Last verified: 2026-05-16
TL;DR
Defines the geographic scope of the rules: COLREGs applies on the high seas and connected waters; the Inland Rules apply inside the demarcation lines on US inland waters.
Why it shows up on the exam
Demarcation-line questions (which set of rules applies where) come up most often on Near-Coastal exams.
Inland-specific notes
Inland Rule 1 references the demarcation lines published in 33 CFR Part 80.
Authoritative source
Source links checked against the current public rule corpus on 2026-05-16.
International parallel
COLREGs Rule 1 — Application →More from Part A — General
Related drills
Drill Inland Rule 1
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