Question 16 GLI07 - OUPV

The Correct Answer is C. **Why Option C is Correct:** The steering and sailing rules for vessels in restricted visibility are defined in Part B, Section III (Rules 19) of the International Regulations for Preventing Collisions at Sea (COLREGs). Rule 19 explicitly states that this section applies to vessels **"navigating in or near an area of restricted visibility."** This rule requires all vessels operating under these conditions—regardless of whether they are international or inland, large or small, or equipped with specific technology—to take specific actions (like maintaining a safe speed, having engines ready, and taking into account the prevailing circumstances and conditions) whenever visibility is impaired. **Why the Other Options are Incorrect:** * **A) only if they have operational radar:** This is incorrect. While having operational radar is a crucial factor to consider (Rule 19(b)), the rules apply to **all** vessels in restricted visibility, even those without radar. Vessels without radar must comply just as rigorously, often by relying more heavily on sound signals and reducing speed. * **B) in sight of one another in fog:** This is incorrect. If vessels are **in sight** of one another, even in fog, they must follow the rules for vessels **in sight of one another** (Part B, Section II, Rules 12–18). The rules for restricted visibility (Section III, Rule 19) specifically apply when vessels are **not** in sight of one another. * **D) only if they are showing special purpose lights:** This is incorrect. The requirement to follow restricted visibility rules is based purely on the meteorological condition (poor visibility), not on the vessel's status or the lights it is displaying. Showing special purpose lights (like lights for vessels constrained by their draft or towing) does not negate or activate the requirement to comply with Rule 19.