USCG Exam Practice · Rule 23 — Power-driven Vessel Underway (lights)
At night you observe a vessel displaying an all-round flashing yellow light in addition to the standard underway lights for a power-driven vessel. This indicates the vessel is most likely which of the following?
- AA WIG craft in flight near the surface
- BAn air-cushion vessel operating in the non-displacement mode✓ correct
- CA vessel not under command
- DA vessel restricted in her ability to maneuver
Why B is correct
33 CFR §83.23(b) requires an air-cushion vessel operating in the non-displacement mode to exhibit an all-round flashing yellow light in addition to the standard power-driven vessel underway lights. A WIG craft displays a high-intensity all-round flashing red light, not yellow, per §83.23(c).
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