Question 535 Rules of the Road

The correct answer is D) All of the above. The danger signal can be used by any of the following vessels: 1) Either of two power-driven vessels meeting head-on, as per Rule 34(d) of the International Regulations for Preventing Collisions at Sea (COLREGS). 2) The vessel to starboard when two power-driven vessels are crossing, as per Rule 15 of the COLREGS. 3) A vessel engaged in fishing, crossing the course of a sailing vessel, as per Rule 18(c) of the COLREGS. The other options are incorrect because they only describe specific situations, while the danger signal can be used in all of the listed scenarios.