Question 975 Rules of the Road

The correct answer is D) sound only fog signals until the other vessel is sighted. The reasoning for this is based on the International Regulations for Preventing Collisions at Sea (COLREGS), which govern navigation rules for vessels at sea. According to COLREGS Rule 35, in conditions of restricted visibility, vessels are required to sound the appropriate fog signals, but are not required to sound whistle signals to indicate a change in course or other maneuvers until the other vessel is visually sighted. The other options are incorrect because sounding whistle signals before the other vessel is sighted (A and B) would not be in compliance with COLREGS, and not sounding any signals at all (C) would also be a violation of the rules for vessels operating in restricted visibility.