INTERNATIONAL ONLY What whistle signal, if any, would be sounded when two vessels are meeting, but will pass clear starboard to starboard?

Correct Answer: Option D — No signal is required.

Under COLREGS Rule 34(a), whistle signals are only required when vessels are in sight of one another and are actively altering course. A meeting situation where vessels pass clear starboard to starboard without changing course requires no whistle signal. Signals are reserved for active maneuvers, not for maintaining a steady course.