Question 19 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is A. A vessel is on your starboard quarter, range decreasing, bearing is constant. ### Why Option A is Correct Option A describes a situation where a vessel is on a **constant bearing** (the compass direction to the other vessel is not changing) and the **range is decreasing** (the distance between the vessels is getting smaller). According to Rule 7(d)(i) of the COLREGs (International Regulations for Preventing Collisions at Sea), risk of collision shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change. When this constant bearing is combined with decreasing range, it satisfies the definition of a **"Constant Bearing, Decreasing Range" (CBDR)** situation. CBDR is the universal definition, applicable both internationally and in inland waters, for a definite risk of collision. ### Why Other Options Are Incorrect **B) A vessel is 22 degrees abaft your port beam, range increasing, bearing is constant.** * While the bearing is constant, the **range is increasing**. This means the vessel is moving away from you (or you are moving away from it) and the risk of collision is being avoided. **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 vessels are not on a collision course. If the bearing is changing quickly, the vessel will pass either ahead or astern, provided the bearing continues to change. **D) A vessel is 22 degrees on your port bow, range increasing, bearing changing slightly to the right.** * Both the **range is increasing** (moving away) and the **bearing is changing** (not on a CBDR course). Therefore, there is no risk of collision.