BOTH INTERNATIONAL & INLAND Which statement is TRUE concerning the signal consisting of at least five short and rapid blast of the whistle to indicate a vessel fails to understand the intentions or actions of another vessel?
• Rule 34(d) – Maneuvering and Warning Signals (Signal of Doubt) • What "at least five short and rapid blasts" actually means in terms of minimum number and who may use it • Difference between a signal of doubt and distress signals (e.g., mayday, red flares)
• Look carefully at the rule’s wording: does it say only the stand-on vessel, or does it refer to either/any vessel in doubt? • Does "at least five" allow a minimum of four, or does it require five or more? Compare that carefully with one of the choices. • Ask yourself: is a doubt about another vessel’s intentions the same situation as distress, or are those covered by completely different signals and rules?
• Verify in Rule 34(d) whether the doubt signal is restricted to any particular vessel (stand-on or give-way), or applies to any vessel in sight that is in doubt. • Confirm that the rule says "at least five short and rapid blasts" and think about what that means for the minimum number of blasts. • Check in the Distress Signals rule (Annex IV) that distress signals are for grave and imminent danger, not just confusion about intentions, and see if they are described as alternatives to the doubt signal.
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