Question 48 RVR01 - Master of Unlimited Tonnage

The Correct Answer is D. **Why option D ("at all times") is correct:** The requirement to maintain a proper look-out is a fundamental safety principle codified in the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 5, which applies to both international (seagoing) and inland waters (where local rules adopt COLREGs principles). 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" explicitly mandates continuous vigilance, regardless of the time of day, weather conditions, location, or traffic density. **Why each of the other options is incorrect:** * **A) only at night:** This is incorrect because the risk of collision exists during the day as well. Visibility during daylight hours does not eliminate the need for a look-out to detect other vessels, evaluate collision risk, and monitor navigational hazards. * **B) at night and during restricted visibility:** While the need for an effective look-out is obviously heightened during these conditions, restricting the look-out requirement only to these times violates Rule 5. A proper look-out must still be maintained during clear daylight hours. * **C) only during restricted visibility:** This is incorrect for the same reasons as A and B. A look-out is necessary during clear visibility to observe other vessels (particularly smaller ones), monitor traffic, and assess the navigational situation.