Rules of the Road · Day Shapes
A seaplane on the water at night is required by Rule 31 to show, as far as practicable:
- ALights corresponding to those of power-driven vessels✓ Correct
- BAn all-round white light only
- CFlashing yellow lights
- DRed sidelights and an all-round white light
Explanation
Rule 31 requires a seaplane or WIG craft on the water to show lights and shapes as close as practicable to those prescribed for a power-driven vessel of the same status (underway, at anchor, etc.). The rule acknowledges that seaplanes may not be able to comply exactly due to their configuration.
Authority: 72 COLREGS Rule 31
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