Question 16 GLI04 - Mate of LT 500-1600 GRT

The Correct Answer is C. **Explanation for C (navigating in or near an area of restricted visibility):** The steering and sailing rules concerning restricted visibility (specifically Rule 19 of the COLREGs – Rules for Vessels in Restricted Visibility) apply whenever a vessel is operating in conditions of restricted visibility (such as fog, mist, heavy rain, or snow) or is approaching an area where such conditions exist. The language of Rule 19 states: "This Rule 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 appropriate action (such as reducing speed and listening for fog signals) proactively, minimizing the risk of collision before they are actually in the densest part of the restricted area. **Why other options are incorrect:** * **A) only if they have operational radar:** Rule 19 applies to all vessels regardless of whether they are equipped with radar. While having operational radar (and using it correctly) is a crucial requirement under Rule 19, the rule itself is mandatory for all vessels when visibility is restricted. * **B) in sight of one another in fog:** If vessels are in sight of one another, they are governed by Rule 11 (Vessels in Sight of One Another) and the subsequent rules concerning normal sight conditions (Rules 13-17), not Rule 19 (Restricted Visibility). Restricted visibility rules apply specifically when vessels are *not* in sight of one another. * **D) only if they are showing special purpose lights:** Showing special purpose lights (like lights for fishing vessels, vessels constrained by their draft, etc.) determines the rights and responsibilities of a vessel under Rules 24 through 31, but it does not define when the restricted visibility rules (Rule 19) apply. Rule 19 applies based on the environmental condition (restricted visibility), not the vessel's specific activity or lighting status.