BOTH INTERNATIONAL & INLAND In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close-quarters situation is developing or risk of collision exists. If so, she shall __________.
• Rule 19 – Conduct of vessels in restricted visibility • Difference between action with radar information only vs when you also have sight of the other vessel • What actions are specifically REQUIRED vs what actions are merely PERMITTED or good seamanship
• Ask yourself: In restricted visibility, when you only have radar information, which kind of course change is the Rules especially cautious about? • Consider whether sound signals (like five short blasts) are required in this situation, or just optional when the situation is doubtful or you need to attract attention. • Think about whether the Rules limit you to course changes only, or if speed changes are also contemplated when using radar alone.
• Re‑read Rule 19(d) carefully and match its exact wording to the answer choices. • Check which option describes a mandatory action, not just a possible or good‑practice one. • Verify whether the Rules anywhere say you must sound five short blasts specifically in this radar‑only restricted‑visibility situation.
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