BOTH INTERNATIONAL & INLAND The lights shown in illustration D068RR mean that another vessel should NOT pass within what distance?

Correct Answer: Option A — 1000 meters

Rule 27(d) describes a vessel restricted in her ability to maneuver. When such a vessel is engaged in dredging or underwater operations and an obstruction exists, she must display lights to indicate the safe side for passing. The 1000-meter distance is the standard safety buffer defined in these regulations.