Question 44 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is D. **Explanation for D (Vessel "A" is backing engines) being correct:** According to both the International Regulations for Preventing Collisions at Sea (COLREGs) and the U.S. Inland Rules (Rule 34 – Maneuvering and Warning Signals), a signal of **three short blasts** means: "**My engines are going astern.**" This signal indicates that the vessel sounding the whistle is actively using its engines to slow down or reverse its direction (backing engines). **Explanation for why other options are incorrect:** * **A) Vessel "A" intends to hold course and speed:** There is no specific whistle signal in the Rules designated solely for "intends to hold course and speed." Maneuvering signals typically indicate an alteration of course or speed, or an intent to pass. * **B) Vessel "A" is sounding a signal of doubt:** A signal of doubt (or confusion/danger signal) is **five or more short and rapid blasts**. Three short blasts has a very specific, operational meaning (engines going astern). * **C) Vessel "A" proposes to cross ahead of the other vessel:** A vessel proposing to cross ahead would likely be proposing a maneuver that involves altering course, typically signaled by one short blast (I am altering my course to starboard) or two short blasts (I am altering my course to port), depending on the specific situation and whether the vessels are in sight of one another. Three short blasts specifically means the vessel is reversing its engines.