Question 33 RVR04 - Master or Mate of LT 200 GRT

The Correct Answer is D **Explanation for Option D (All of the above):** Option D is correct because all three listed conditions (A, B, and C) are recognized situations or warning signs indicating that a risk of collision exists under both International (COLREGs) and Inland Rules. Rule 7 of both sets of regulations addresses the determination of risk of collision, emphasizing that proper lookout and early assessment are necessary. **Detailed Explanation of Options A, B, and C (Why they indicate risk):** * **C) if the compass bearing of an approaching vessel does NOT appreciably change:** This is the primary and most critical rule established in Rule 7(a)(i). If the compass bearing remains constant, a risk of collision exists, regardless of whether the range is decreasing. * **B) if you observe both sidelights of a vessel ahead for an extended period of time:** When observing both sidelights (red and green) of another vessel, it means that vessel is generally dead ahead or nearly so. If this situation persists (especially if the vessel is approaching), it indicates a head-on or near head-on situation, which poses a significant risk of collision requiring early action (Rule 7(a)(ii) mentions this being an indication, particularly when approaching a very large vessel). * **A) even when an appreciable bearing change is evident, particularly when approaching a vessel at close range:** Rule 7(a)(ii) specifically warns that risk may sometimes exist even when an appreciable bearing change is evident, particularly when approaching a very large vessel or a tow, or when approaching another vessel at close range. This acknowledges that traditional bearing observation is not always sufficient when vessels are close or maneuvers are complex. Since A, B, and C all accurately describe situations where a risk of collision exists under the navigational rules, **D (All of the above)** is the correct choice. **Explanation of Why Other Options are Incorrect (as standalone answers):** Since D is the correct answer and encompasses A, B, and C, none of the individual options (A, B, or C) can be the *only* correct answer. * **A) is incorrect** as the sole answer because C (constant bearing) is the fundamental indicator recognized by the rules. * **B) is incorrect** as the sole answer because C (constant bearing) is the fundamental indicator recognized by the rules. * **C) is incorrect** as the sole answer because A and B also describe valid risk conditions defined in the rules.