History
I consider myself well-read on WW2 naval history. I have never come across an account of any convoy escorted by a submarine. In particular a submerged sub would not have the speed to keep up with any convoy.
This can only be a concept invented in a mod. What mod(s) are you working with. Again, the suggestion was just that, since you didn't detect any sub.
I think the circle/square does have to do with lead ship, but wonder about the idea of sub(s). Just my thoughts on the matter.
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