Question 19 UFV01 - Master - Uninspected Fishing Vessels

The Correct Answer is A. A) **Why option A ("A vessel is on your starboard quarter, range decreasing, bearing is constant.") is correct:** The risk of collision exists if the Constant Bearing, Decreasing Range (CBDR) criteria is met. When a vessel's bearing remains constant while its range is decreasing, it indicates that the two vessels are on a collision course. While the question mentions the vessel is on the starboard quarter (meaning it is theoretically overtaking you, and you would be the stand-on vessel in International/Inland Rules), the definition of risk of collision applies universally: **Constant Bearing + Decreasing Range = Risk of Collision**. **Why the other options are incorrect:** B) **A vessel is 22 degrees abaft your port beam, range increasing, bearing is constant:** While the bearing is constant (suggesting a potential collision course if ranges were decreasing), the range is **increasing**. Increasing range means the vessels are moving away from each other, which eliminates the risk of collision. C) **A vessel is broad on your starboard beam, range decreasing, bearing changing rapidly to the right:** Although the range is decreasing, the bearing is changing rapidly. A rapid change in bearing means the vessel is passing well clear or is already taking significant action to avoid collision (crossing rapidly ahead or astern). Because the bearing is not constant, the CBDR rule is not met, and collision risk, by definition, does not definitely exist. D) **A vessel is 22 degrees on your port bow, range increasing, bearing changing slightly to the right:** This option features both an increasing range and a changing bearing. Both factors confirm that the risk of collision does not exist, as the vessel is safely opening (moving away) and clearing your course.