What is the meaning of a flag hoist consisting of the code letters "WM" (Whiskey Mike) when displayed by an icebreaker?
Official USCG Answer & Rule Citation
Correct Answer: Option A — "Icebreaker support is now commencing."
International ice navigation signals prescribe that the flag hoist "WM" (Whiskey Mike) displayed by an icebreaker specifically communicates that icebreaker support is commencing. Master mariners must recognize this visual signal to coordinate formation movement and speed with the leading icebreaker.
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