BOTH INTERNATIONAL & INLAND During the day, which shape is required for a dredge to exhibit to indicate the side on which it is safe to pass?

Correct Answer: Option A — two diamonds in a vertical line

Rule 27(d)(iii) requires a vessel engaged in dredging or underwater operations to exhibit two diamonds in a vertical line to indicate the side on which passing is safe. This shape configuration serves as the daytime equivalent to the two green lights used at night to signal the safe side for navigation.