Rules of the Road · NUC / RAM / Constrained by Draft
A vessel constrained by her draft may in addition to the lights prescribed for a power-driven vessel underway show:
- AThree all-round red lights in a vertical line OR a cylinder shape by day✓ Correct
- BTwo all-round red lights in a vertical line OR two black balls by day
- CAn all-round red light over an all-round white light
- DA flashing red light and a cylinder
Explanation
Rule 28 permits (not requires) a vessel constrained by her draft to show three all-round red lights in a vertical line OR a cylinder shape by day. This is the only light/shape combination in the COLREGS that uses three vertical red lights; NUC uses only two.
Authority: 72 COLREGS Rule 28
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