Rules of the Road · 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:
- AOne all-round green light at the masthead and one at each end of the sweep
- BThree all-round green lights or three black balls — one at the masthead and one at each end of the sweep✓ Correct
- CTwo all-round green lights in a vertical line
- DA yellow flashing light
Explanation
Rule 27(f) requires a minesweeper to show three all-round green lights (or by day, three black balls) — one near the top of the foremast and one at each end of the foreyard — warning other vessels not to approach within 1000 meters of the minesweeper.
Authority: 72 COLREGS Rule 27(f)
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