Question 863 Rules of the Road

The correct answer is C) Vessel restricted in her ability to maneuver. The International and Inland Navigation Rules state that a vessel restricted in her ability to maneuver must display three shapes in a vertical line, with the highest and lowest being balls and the middle shape being a diamond. This visual signal indicates to other vessels that the displaying vessel is unable to keep out of the way of other ships and requires other vessels to keep clear. The other answer choices do not match the specific shape and configuration described in the question. A vessel constrained by her draft, a minesweeping vessel, or a vessel not under command would display different shapes and configurations.