USCG Exam PracticeRule 9 — Narrow Channels
A vessel that can safely navigate only within a narrow channel is in doubt about the intentions of a vessel attempting to cross the channel ahead of her. Under the Inland Navigation Rules, what signal must the channel-bound vessel sound?
- A. One prolonged blast as prescribed in Rule 34(e)
- B. Two prolonged blasts followed by one short blast
- ✓ The signal prescribed in Rule 34(d)Correct
- D. Five or more short and rapid blasts as prescribed in Rule 34(d)
Why C is correct
33 CFR §83.09(d) states that the vessel constrained to the channel must use the signal prescribed in Rule 34(d) if in doubt as to the intention of the crossing vessel. Option D is a partial description of the danger/doubt signal under Rule 34(d), but option C is the precise, unambiguous answer as cited in the rule text, which refers to Rule 34(d) by designation without paraphrasing its content in §83.09.
Cited:33 CFR §83.09