INLAND ONLY When power-driven vessels are in sight of one another, when shall passing signals be sounded?

Correct Answer: Option A — meeting or crossing within half a mile of each other

33 CFR 83.34(a) explicitly defines the requirement for sound signals in inland waters. When power-driven vessels are in sight of one another and are meeting or crossing at a distance within half a mile of each other, they must exchange the prescribed whistle signals to indicate their intended maneuvers.