On the subject of SoPs and best practices, it seems very few captains that I've been watching on live streams have any conception of periscope discipline. All the actual manuals from the era repeatedly stress the shortest possible exposures, at low speed, to collect the data you need calcuate/check/update a solution.
I get it, because it's fun to see what the heck is going on, but it's a product of the fact that nobody is actually going to die if your scope gets spotted.
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