USCG Exam Practice · Rule 27 — NUC and RAM (lights)
A vessel engaged in mine clearance operations exhibits three all-round green lights. What does this signal indicate to other mariners?
- AIt is dangerous for another vessel to approach within 1000 meters of the mine clearance vessel✓ correct
- BThe vessel is restricted in her ability to maneuver and has a clear passage on both sides
- CThe vessel is not under command and requires assistance
- DThe vessel has an obstruction and other vessels may pass on the green-light side
Why A is correct
33 CFR §83.27(f) specifies that the three all-round green lights exhibited by a mine clearance vessel indicate that it is dangerous for another vessel to approach within 1000 meters of the mine clearance vessel. These lights are not RAM or NUC signals, and are not distress signals per §83.27(h).
Cited:33 CFR §83.27(f)
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