USCG Exam Practice · Aids to Navigation — IALA-B (US) buoyage
Which of the following best describes the shape and color of a nun buoy in the US lateral system?
- ACylindrical, green, odd-numbered
- BConical, red, even-numbered✓ correct
- CSpherical, red, even-numbered
- DConical, green, odd-numbered
Why B is correct
The Light List defines a nun buoy as conical with a pointed top, red in color, and carrying even numbers. It is a starboard-side aid kept to starboard when returning from sea under IALA-B.
Cited:Light List — Nun Buoy
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