Question 16 GLI05 - Master or Mate of LT 200 GRT

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 (Rule 19 of the COLREGs/International and Inland Rules) are specifically designed to be followed whenever a vessel is operating in conditions that limit visibility (such as fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar causes). Furthermore, the rule states that it applies to vessels "navigating in or near an area of restricted visibility." This ensures that vessels prepare for and follow the appropriate procedures (such as safe speed, altered course, and sounding signals) before they are fully enveloped in poor visibility. 2. **Why the other options are incorrect:** * **A) only if they have operational radar:** This is incorrect. While radar is a critical tool for detecting other vessels in restricted visibility (and Rule 19 includes specific guidance on radar use), the steering and sailing rules for restricted visibility apply to *all* vessels, regardless of whether they are equipped with or using radar. Vessels without radar must follow the same core rules regarding safe speed and sounding signals. * **B) in sight of one another in fog:** This is incorrect. If vessels are "in sight of one other," they transition from Rule 19 (Restricted Visibility) to Rules 14–18 (Conduct in Sight of One Another—e.g., Head-on, Crossing, Overtaking). Rule 19 specifically applies when vessels cannot see each other due to the restricted conditions. * **D) only if they are showing special purpose lights:** This is incorrect. Showing special purpose lights (like lights for vessels constrained by draft or fishing) designates a vessel's status or capability, but it does not determine when Rule 19 applies. Rule 19 applies based solely on the environmental condition (restricted visibility).