BOTH INTERNATIONAL & INLAND Which vessel is required to exhibit an all-round flashing yellow light?

Correct Answer: Option B — an air-cushion vessel in the non-displacement mode

Rule 23(b) requires an air-cushion vessel operating in the non-displacement mode to exhibit an all-round flashing yellow light in addition to the lights prescribed for a power-driven vessel. This unique signal alerts other vessels to the high speed and specific maneuverability characteristics of the craft.