Question 683 Rules of the Road

The correct answer is B) Three black balls in a vertical line. According to the Navigation Rules, both International and Inland, a vessel aground must display three black balls in a vertical line as a day signal to indicate its status. This shape is required to be shown by a vessel aground to inform other vessels in the vicinity of its grounded condition and to take appropriate precautions. The other options are incorrect because they do not match the specific shape and configuration required by the Navigation Rules for a vessel aground. A cylinder, two black balls, or two cones with their apexes together are not the correct shapes for this situation.