USCG Exam PracticeAids to Navigation — IALA-B (US) buoyage
In IALA-A waters, what color are starboard-hand lateral marks when returning from sea?
- A. Red
- ✓ GreenCorrect
- C. White
- D. Black
Why B is correct
In IALA-A, starboard-hand marks are green — the same color as the US (IALA-B) system, but reversed in position relative to port-hand marks. The key difference from IALA-B is that port-hand marks are red in IALA-A.