USCG Exam Practice · Aids to Navigation — IALA-B (US) buoyage
In the IALA-B buoyage system used in US waters, which numbering convention applies to red lateral aids?
- AOdd numbers
- BEven numbers✓ correct
- CNumbers prefixed with the letter R
- DNo numbers; red aids are identified by name only
Why B is correct
Under IALA-B, even numbers are assigned to red aids and odd numbers to green aids. This is confirmed by Bowditch Ch. 5 §501, which states 'even numbers on red, odd on green.'
Cited:Bowditch Ch. 5 §501
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