Rules of the Road · NUC / RAM / Constrained by Draft
A vessel engaged in underwater operations that is unable to deviate from its course shall show the RAM lights PLUS, on the side with the obstruction, which additional lights?
- ATwo all-round red lights vertically and on the clear side two all-round green lights vertically✓ Correct
- BA flashing red light on the obstruction side only
- CAn all-round white light on each side
- DA yellow all-round light above the RAM lights
Explanation
Rule 27(d) prescribes that a vessel conducting underwater operations that is at anchor or underway but impeded shall show two all-round red lights (vertically) on the obstruction side and two all-round green lights (vertically) on the safe passing side, in addition to the RAM lights.
Authority: 72 COLREGS Rule 27(d)
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 not under command (NUC) shall show:
- 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: