In restricted visibility, after detecting another vessel by radar, what must you determine first?

• A. Whether a close-quarters situation is developing or risk of collision exists
• B. The vessel's nationality
• C. The vessel's speed
• D. The vessel's color

Answer: (A)

In restricted visibility, the first thing to assess after detecting another vessel by radar is whether a close-quarters situation is developing or if there is a risk of collision. This determination is what drives your next move. If there is a risk, you take action to avoid collision—alter course to pass well clear, reduce speed, and keep monitoring. If no risk exists, you maintain your present course and speed but stay attentive. The other factors like nationality or color aren’t relevant to this immediate decision, and while speed can influence how quickly a risk develops, the essential first step is recognizing whether collision risk is present.