By day, a vessel aground is required to display which shape(s)?

A. One ball
B. Two balls in a vertical line
✓ Three balls in a vertical lineCorrect
D. Three shapes — a ball, a diamond, and a ball — in a vertical line

Why C is correct

33 CFR §83.30(d)(ii) requires a vessel aground to exhibit, in addition to the anchor light(s) or shape, three balls in a vertical line where they can best be seen. The single ball is the anchor shape; three balls is the aground shape.

Cited:33 CFR §83.30

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By day, a vessel aground is required to display which shape(s)? — USCG Exam Practice · CaptainsGround