INTERNATIONAL ONLY On open water two vessels are in an overtaking situation. The overtaking vessel has just sounded one short blast on the whistle. What is the meaning of this whistle signal?

Correct Answer: Option D — "I am changing course to starboard."

Rule 34(a) defines one short blast as an indication that a vessel is altering her course to starboard. In an overtaking situation under International Rules, whistle signals are used solely to indicate a maneuver, not to request permission or signify agreement as is required under the Inland Navigation Rules.