Question 33 RVR01 - Master of Unlimited Tonnage

The Correct Answer is D. **Why option D ("All of the above") is correct:** The risk of collision exists under various circumstances, as defined by the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 7 (Risk of Collision). Since this rule applies to **both international and inland waters** (via conforming national regulations), all scenarios described are indicators of a potential collision risk: * **Option A is a specific scenario of risk:** While a change in bearing normally suggests passing clear, when approaching at very close range, an appreciable bearing change may not be sufficient to negate risk until the vessel is safely past. * **Option B is a clear indicator of risk:** Observing both sidelights (red and green) means you are essentially viewing the vessel head-on or nearly head-on, which is a classic meeting situation and carries an inherent risk of collision. * **Option C is the primary and most important indicator of risk (Rule 7(b)):** If the compass bearing of an approaching vessel does not appreciably change, it means the two vessels are on a collision course, regardless of speed. Since A, B, and C are all valid conditions under which risk of collision may exist, "All of the above" (D) is the correct choice. **Briefly explain why each of the other options is incorrect:** Options A, B, and C are not incorrect statements; they are simply incomplete answers because they individually only list one or two of the valid conditions under which collision risk exists. Since all three preceding statements are true indicators of collision risk, they cannot individually be the single best answer.