INTERNATIONAL ONLY Your vessel is backing out of a slip in a harbor. Visibility is restricted. You should sound __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — one prolonged blast only
Under COLREG Rule 35(i), a vessel backing out of a berth or slip in restricted visibility must sound one prolonged blast to warn approaching traffic, alerting them to the unmaneuverable astern movement.
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