Weirs raft and flag
I believe in the 50's there was a afts in eirs Bay with a flag pole. When the ice was gone, or soft enough, the flagpole tipped over. I think the flag was connected to a clock device, so, if the ice was "out" in the dark, everybody knew an exact time. More precise than a visual fly over, but only fore the Weirs, not other ports of call for the Mount. I suspect this "4 ports of call" business is recent, meaning in the last 50 years. Records go back much farther, but the definition has changed over time.
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