Rules of the Road · Sailing Vessels
A sailing vessel proceeding under sail AND using her engine shall display by day:
- AA black ball shape forward
- BA black cone with apex downward forward✓ Correct
- CA black diamond shape
- DNo special day shape is required
Explanation
Rule 25(e) requires a sailing vessel proceeding under sail when also being propelled by machinery to show a conical shape, apex downwards, at the forward part of the vessel. This alerts other mariners that despite the sails, she is operating as a power-driven vessel for rules purposes.
Authority: 72 COLREGS Rule 25(e)
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