Question 17 RVR01 - Master of Unlimited Tonnage

The Correct Answer is A. **Explanation for A (Correct Answer):** Option A, "A vessel that you can see from the bridge," accurately defines a vessel that is "in sight" according to the nautical Rules of the Road (COLREGs/Inland Rules). The applicability of certain rules, particularly those governing visibility (like Rule 19 - Conduct of vessels in restricted visibility), shifts to the general steering and sailing rules (Rules 4 through 18) when vessels are **in sight of one another**. A vessel is deemed "in sight" only when it can be visually observed. This is a fundamental threshold determining which specific set of collision prevention rules apply. **Explanation for B (Incorrect):** Option B, "A radar target of which you have determined the course and speed," is incorrect. A radar target indicates the presence and movement of another vessel but does not constitute "sight." As long as the vessel is only detectable by radar (or other electronic means) but not visually observed, the vessel is operating in **restricted visibility**, and Rule 19 (Restricted Visibility) remains in effect. **Explanation for C (Incorrect):** Option C, "A vessel from which you can hear the fog signal," is incorrect. Hearing a fog signal confirms the proximity of another vessel that is also operating in restricted visibility, and specific cautionary actions are required (Rule 19(e)). However, hearing a signal does not equate to seeing the vessel visually ("in sight"). If you only hear the signal, you are still operating under restricted visibility rules until visual contact is made. **Explanation for D (Incorrect):** Since options B and C do not meet the definition of "in sight," D ("All of the above") is incorrect. Only visual confirmation (A) constitutes a vessel being "in sight."