Rules of the Road · NUC / RAM / Constrained by Draft
A vessel not under command (NUC) shall show:
- AOne all-round red light and a flashing white light
- BTwo all-round white lights in a vertical line
- CAn all-round red light over an all-round white light
- DTwo all-round red lights in a vertical line and, when making way, sidelights and sternlight✓ Correct
Explanation
Rule 27(a) prescribes two all-round red lights in a vertical line for a NUC vessel. When making way, she adds sidelights and a sternlight. Red over red — not white — is the critical identifier distinguishing NUC from fishing (red over white) or RAM (red-white-red).
Authority: 72 COLREGS Rule 27(a)
Practice the full Rules of the Road bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Rules of the Road questions
- NUC / RAM / Constrained by Draft
A vessel restricted in her ability to maneuver (RAM) shall show which all-round lights?
- NUC / RAM / Constrained by Draft
By day, what shapes does a vessel restricted in its ability to maneuver display?
- NUC / RAM / Constrained by Draft
You observe a vessel at night showing red-white-red all-round lights in a vertical line, two masthead lights, sidelights, and a sternlight. What is this vessel?
- NUC / RAM / Constrained by Draft
A vessel engaged in dredging or underwater operations, when underway and making way, shows in addition to the RAM lights:
- NUC / RAM / Constrained by Draft
A vessel engaged in minesweeping operations shall show, in addition to the lights prescribed for a power-driven vessel underway:
- 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: