Question 48 RVR05 - Master of LT 100 GRT

The Correct Answer is D **Explanation for Option D (at all times):** The requirement for maintaining a proper look-out is fundamental to safe navigation and is mandated by Rule 5 (Look-out) of the International Regulations for Preventing Collisions at Sea (COLREGs), which applies to both international and inland waters (often adopted by national authorities). Rule 5 states: "Every vessel shall at all times maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision." The phrase "at all times" means the duty is continuous, regardless of the time of day, weather conditions, or location. **Explanation for why the other options are incorrect:** * **A) only at night:** This is incorrect because the risk of collision exists during the day as well. The duty to maintain a proper look-out is continuous (at all times), not restricted to nighttime. * **B) at night and during restricted visibility:** While the need for a diligent look-out is heightened during these periods, limiting the requirement only to these times fails to account for clear daylight conditions where traffic density and collision risks may still be high. The rule specifies "at all times." * **C) only during restricted visibility:** This is incorrect. Visibility conditions do not negate the requirement for a look-out. A collision can occur in perfect visibility if a proper look-out is not being maintained.