I sailed the "targets", not the subs; but I am friends with a couple of retired sub commanders from whose discussions I assembled the key points about subs, above; I have worked both radar and active sonar as a watch officer, and even a couple of stories up and under 30, your eyes can be readily deceived by sea clutter; and the closer to the deck you get the worse your optical picture. Apologies if I seemed to be posing as an expert, I meant to just rattle out the best data I could come up with. I believe the perspective to be reliable.

A