Rules of the Road · Sailing Vessels
You observe a vessel showing only a tricolor lantern at the masthead. What type of vessel is this most likely to be?
- AA power-driven vessel less than 12 meters in length
- BA sailing vessel less than 20 meters in length underway✓ Correct
- CA vessel at anchor with a single white light
- DA pilot vessel on duty
Explanation
Rule 25(b) permits sailing vessels less than 20 meters to combine the sidelights and sternlight into a tricolor lantern at or near the masthead. The tricolor replaces the separate sidelights and stern light — it is never used with a white masthead light.
Authority: 72 COLREGS Rule 25(b)
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