Question 16 GLI02 - Mate of Unlimited Tonnage

The Correct Answer is C 1. **Why option C ("navigating in or near an area of restricted visibility") is correct:** The rules governing the conduct of vessels in restricted visibility are defined in Part B, Section III (Rules 19) of the International Regulations for Preventing Collisions at Sea (COLREGs), which apply internationally and to inland waters that adopt these rules. Rule 19 explicitly states that this section applies to vessels **not in sight of one another when navigating in or near an area of restricted visibility.** This broad application ensures that vessels take precautions *before* entering or *while* operating near fog, heavy rain, snow, or any other condition that limits visibility, thereby preventing collisions. 2. **Why the other options are incorrect:** * **A) only if they have operational radar:** This is incorrect. While radar is a powerful tool addressed specifically in Rule 19 for determining risk of collision, the steering and sailing rules for restricted visibility apply to *all* vessels, regardless of whether they are equipped with radar. A vessel without radar is still required to follow the sound signal requirements and proceed at a safe speed appropriate to the prevailing circumstances and conditions. * **B) in sight of one another in fog:** This is incorrect. If vessels are in sight of one another, they are governed by Part B, Section I (Conduct of Vessels in Any Condition of Visibility) and Section II (Conduct of Vessels in Sight of One Another), particularly Rules 12 through 18. Rule 19 (Restricted Visibility) specifically applies when vessels are **not** in sight of one another. * **D) only if they are showing special purpose lights:** This is incorrect. The application of the restricted visibility rules (Rule 19) depends on the environmental conditions (visibility), not on the type of lights the vessel is showing. Every vessel, whether a power-driven vessel, sailing vessel, fishing vessel, or vessel restricted in its ability to maneuver (which uses special purpose lights), must adhere to Rule 19 when visibility is restricted.