Question 19 MODU02 - Barge Supervisor

The Correct Answer is A **Why Option A is Correct:** Option A describes the classic situation known as Constant Bearing, Decreasing Range (CBDR). The International Regulations for Preventing Collisions at Sea (COLREGs), Rule 7 (Risk of Collision), specifically states that risk shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change. When the bearing is constant and the range is decreasing, it means that if both vessels maintain their course and speed, they will arrive at the same point (the collision point) simultaneously. Therefore, risk of collision **definitely exists**. **Why the Other Options are Incorrect:** * **B) A vessel is 22 degrees abaft your port beam, range increasing, bearing is constant.** Although the bearing is constant, the range is increasing. An increasing range means the vessel is moving away from you or is dropping astern faster than you are gaining on it. If the range is increasing, there is no risk of collision. * **C) A vessel is broad on your starboard beam, range decreasing, bearing changing rapidly to the right.** A decreasing range suggests proximity, but a rapid change in bearing means the vessels are on crossing paths that will result in a clear miss. The approaching vessel is swinging ahead or astern of your predicted path quickly. Risk of collision does not exist under this condition. * **D) A vessel is 22 degrees on your port bow, range increasing, bearing changing slightly to the right.** Both the range is increasing (vessel moving away) and the bearing is changing (not CBDR). Because the vessel is moving away, there is no risk of collision.