BOTH INTERNATIONAL & INLAND A vessel at anchor will show which shape?
Official USCG Answer & Rule Citation
Correct Answer: Option C — ball
Rule 30(a) mandates that a vessel at anchor shall display a black ball in the forepart of the vessel where it can best be seen. This shape is the universal daylight signal for an anchored vessel, ensuring that other mariners can easily identify the vessel's status and maintain a safe distance.
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