Rules of the Road · Anchored & Aground
By day, a vessel aground shall display:
- AThree black balls in a vertical line✓ Correct
- BTwo black balls in a vertical line
- CA cylinder shape
- DA black ball and a cylinder
Explanation
Rule 30(d)(ii) requires a vessel aground to display three black balls in a vertical line by day. This contrasts with the anchor shape (one black ball) or NUC (two balls), making three balls the unambiguous 'stuck on the bottom' signal.
Authority: 72 COLREGS Rule 30(d)(ii)
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