🔍 Key Concepts

• Rule 18 – Responsibilities Between Vessels (how special classes of vessels behave) • How the COLREGS treat seaplanes on the water compared to power‑driven vessels • The meaning of shapes and constrained by draft in the Navigation Rules

💭 Think About

• Ask yourself: When a seaplane is on the water and maneuverable, is it generally treated like a vessel, or does it have a standing obligation to stay out of everyone’s way? • Look at which options talk about lights/shapes versus right‑of‑way. Which one best matches the COLREGS wording, not just what sounds reasonable? • Consider whether a seaplane on the water would normally qualify as a vessel constrained by her draft, and what that term technically means.

✅ Before You Answer

• Verify in the Navigation Rules how seaplanes on the water are defined and what their general responsibility is compared to other vessels. • Check the exact definition of vessel constrained by her draft and see if a seaplane realistically fits that definition. • Confirm whether the Rules treat lights and shapes for seaplanes differently from other power‑driven vessels when they are operating on the water.