Question 859 Rules of the Road

The correct answer is D) laying submarine cable. The day signal shown in illustration D006RR depicts two black balls or shapes displayed vertically on the vessel. This signal indicates that the vessel is "engaged in laying, servicing or picking up a submarine cable", as per the International Rules of the Road and the Inland Navigation Rules. The other answer choices are incorrect because they do not match the specific day signal being displayed. A vessel fishing with trawls would display different signals, a vessel aground would not display this signal, and a vessel not under command would display a different set of shapes.