BOTH INTERNATIONAL & INLAND Two power-driven vessels are crossing as shown in illustration D042RR below. Vessel "A" sounds one short blast on the whistle. You are on vessel "B" and doubt that sufficient action is being taken by vessel "A" . What action should you take?
• Rule 15 – Crossing Situation: Which vessel is the stand-on vessel and which is the give-way vessel based on the relative position shown? • Rule 16 – Action by Give-way Vessel and Rule 17 – Action by Stand-on Vessel: What is each vessel required to do once a risk of collision exists? • Rule 34(d) – Doubt or Confusion Signal: What sound signal is used when you are in doubt that the other vessel is taking appropriate action?
• From vessel "B", is vessel "A" on your port side or starboard side? That tells you whether you are stand-on or give-way. • If you doubt that vessel "A" is taking proper avoiding action, what do the Navigation Rules say you must communicate by sound signal before anything else? • Among the options, which action directly matches the rule for a vessel that is in doubt about the intentions or action of the other vessel in a risk-of-collision situation?
• Be sure you have clearly identified which vessel is give-way and which is stand-on from the diagram before choosing. • Verify in Rule 34(d) exactly how many and what kind of blasts are prescribed when you are "in doubt" as to the other vessel’s action or intentions. • Confirm that your chosen option both follows the correct sound signal requirement and is consistent with your responsibilities as the give-way or stand-on vessel.
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