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112. When does a vessel which is being assisted by an icebreaker, display a flag hoist consisting of the code numeral «4»?
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« Go to questions from category Q306 — Great Lakes TopicsA vessel assisted by an icebreaker displays code numeral «4» when it becomes icebound, indicating it is trapped and unable to move without further assistance. This signal communicates a critical situation requiring immediate attention from the icebreaker, as it may obstruct the channel or necessitate towing.
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