Question 44 GLI04 - Mate of LT 500-1600 GRT

The Correct Answer is D **Explanation for Option D (Correct):** The meaning of whistle signals is defined by the International Regulations for Preventing Collisions at Sea (COLREGs), which apply to both International and Inland waters (though specific inland rules may have slight variations, the basic maneuvering signals are consistent). Rule 34(a) governs maneuvering and warning signals. The signal of **three short blasts** means: **"I am operating astern propulsion"** (backing engines). This indicates that the vessel is actively using its engine to move backward or stop its forward motion. **Explanation for Other Options (Incorrect):** * **A) Vessel "A" intends to hold course and speed:** This is incorrect. A single short blast (one second) typically indicates an intention to alter course to starboard (when meeting or overtaking) or a general intent to maneuver, but there is no specific signal defined solely for "holding course and speed." "Holding course and speed" is the duty of the stand-on vessel, not a whistle signal. * **B) Vessel "A" is sounding a signal of doubt:** This is incorrect. The signal of doubt or uncertainty (often called the "danger signal") is **five or more short and rapid blasts**. * **C) Vessel "A" proposes to cross ahead of the other vessel:** This is incorrect. Intentions regarding crossing ahead are usually communicated through agreement (passing port-to-port or starboard-to-starboard, using one or two short blasts respectively) or determined by the rules of the road (give-way/stand-on). Three short blasts specifically signifies astern propulsion, not an intention to cross ahead.