USCG Exam Practice · Aids to Navigation — IALA-B (US) buoyage
A mariner returning from sea in US waters observes a conical, pointed-top buoy with an even number. On which side should this buoy be kept?
- APort side
- BDead ahead
- CStarboard side✓ correct
- DEither side, as the number indicates a safe water mark
Why C is correct
A nun buoy is a conical, pointed-top, red aid carrying an even number. In IALA-B, nuns are kept on the starboard side when returning from sea. Light List — Nun Buoy; Bowditch Ch. 5 §501.
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