Question 32 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is D **Explanation for Option D (Correct):** Option D, "When the give-way vessel is not taking appropriate action to avoid collision," is the correct answer based on Rule 17(b) of the International Regulations for Preventing Collisions at Sea (COLREGs), which applies to both international and inland waters (in the US, generally via incorporation). Rule 17(b) addresses the action by the stand-on vessel: > *The stand-on vessel may take action to avoid collision by her manoeuvre alone as soon as it becomes apparent to her that the vessel required to keep out of the way is not taking appropriate action in compliance with these Rules.* This means the stand-on vessel is permitted to act defensively (a "may" clause) the moment it perceives that the give-way vessel is failing in its duty. This is the **first** opportunity granted by the Rules for the stand-on vessel to deviate from its course and speed. **Explanation of Incorrect Options:** **A) The stand-on vessel is never allowed to take action:** This is incorrect. The Rules specifically allow the stand-on vessel to take action under Rules 17(b) and 17(c), and mandate action under Rule 17(c). **B) When the two vessels are less than half a mile from each other:** This is incorrect. The Rules do not specify a fixed distance (like half a mile) for when the stand-on vessel *first* gains the ability to maneuver. The triggering condition is the observation of the give-way vessel’s inaction, regardless of the precise range. **C) When collision is imminent:** This is incorrect because it is too late. Rule 17(c) states that the stand-on vessel **shall** take action when collision cannot be avoided by the action of the give-way vessel alone (i.e., when collision is truly unavoidable/imminent). However, Rule 17(b) permits the stand-on vessel to act *before* the collision becomes imminent (i.e., when the give-way vessel's inaction is merely *apparent*), making D the point where the stand-on vessel is **FIRST** allowed to act.