Question 63 ONC04 - Mate of LT 500-1600 GRT

The Correct Answer is D. ### Why Option D ("Stop your engines") is Correct The Canadian Coast Guard (CCG) uses specific codes, often derived from the International Code of Signals (ICS) or adapted for ice operations, to communicate instructions to vessels under escort. In ice operations, when a vessel is being assisted by an icebreaker, the code flag **"N" (November)**, when flown by the assisting vessel (the icebreaker), specifically means **"STOP."** In the context of machinery commands for a vessel operating in close proximity to an icebreaker, "STOP" is universally interpreted as a request to stop the vessel's propulsion. Stopping the engines is the most effective and appropriate action to achieve a complete stop of the vessel's movement in these situations, preventing the assisted vessel from closing the distance too quickly or running into the icebreaker. ### Why Other Options Are Incorrect **A) Reduce speed:** While reducing speed is generally prudent when operating near an icebreaker or in hazardous conditions, it is an insufficient response to a direct "STOP" signal (Flag N). Reducing speed implies continued forward motion, which contradicts the explicit instruction given by the icebreaker. **B) Stop your vessel instantly:** While the goal is to stop, the phrase "instantly" suggests an emergency maneuver, such as dropping anchors or full astern power, which could be dangerous and damaging in heavy ice or close to the icebreaker. The appropriate technical command to achieve a stop signaled by Flag N is to stop the propulsion (stop the engines), allowing the vessel to lose way naturally or due to the surrounding ice pressure. **C) Reverse your engines:** Reversing the engines (using astern power) is a maneuver intended to quickly decelerate or move backward. It is too aggressive a response for the general "STOP" signal unless specifically commanded (e.g., Flag S – Sierra, "I am operating astern propulsion/You should operate astern propulsion"). Reversing in dense ice can sometimes cause propeller damage or create hazardous ice conditions between the two vessels. The primary action for a general "STOP" is simply to stop propulsion (engines off/clutch out).