USCG Exam Practice · Rule 34 — Maneuvering and Warning Signals
On inland waters, three short blasts on the whistle by a power-driven vessel underway signifies which of the following?
- AI intend to leave you on my starboard side
- BI am in doubt about your intentions
- CI am operating astern propulsion✓ correct
- DI intend to overtake you on your port side
Why C is correct
33 CFR §83.34(a)(i)(3) states that three short blasts mean 'I am operating astern propulsion.' This signal indicates the use of astern propulsion, not necessarily that the vessel is moving astern.
Cited:33 CFR §83.34
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