USCG Exam Practice · Aids to Navigation — IALA-B (US) buoyage
A vessel is transiting from the open sea into a US harbor. The navigator observes a red lighted buoy to starboard. Which statement correctly describes this situation under IALA-B?
- AThe buoy is correctly positioned; red aids are kept to starboard when returning from sea.✓ correct
- BThe buoy is incorrectly positioned; red aids must be kept to port when returning from sea.
- CThe buoy is a preferred-channel mark because it is red and lighted.
- DThe buoy marks the port side of the channel because the vessel is inbound.
Why A is correct
Under IALA-B, 'red right returning' means red aids are kept to starboard when returning from sea (i.e., proceeding from open water toward a harbor). A red buoy to starboard of an inbound vessel is correctly positioned. Bowditch Ch. 5 §501; Light List — light-characteristic (R).
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