USCG Exam PracticeRule 18 — Responsibilities Between Vessels
Inland Rule 18 begins with the phrase 'Except where Rules 9, 10, and 13 otherwise require.' What is the practical significance of this exception?
- ✓ Rules 9, 10, and 13 can override the normal give-way hierarchy established by Rule 18.Correct
- B. Rule 18 takes precedence over Rules 9, 10, and 13 in all circumstances.
- C. Rules 9, 10, and 13 apply only in restricted visibility and therefore never conflict with Rule 18.
- D. The exception applies only to vessels not under command.
Why A is correct
33 CFR §83.18 expressly subordinates itself to Rules 9 (narrow channels), 10 (traffic separation schemes), and 13 (overtaking). For example, an overtaking vessel under Rule 13 must keep out of the way of the vessel being overtaken regardless of vessel type hierarchy under Rule 18. This prevents Rule 18's general hierarchy from overriding those specific situational rules.
Cited:33 CFR §83.18