Quote:
Originally Posted by desirableroasted
I am not a diver, but diving friends tell me the difference between a sunny, clear day and a cloudy one is enormous even at fairly shallow depths (and not being a diver, I don't know how deep that is, but certainly not more than we are talking about).
It certainly seems plausible that you could look up with the scope at a fairly shallow depth and see the shadow of a ship, if the sun was right. Makes sense. But keeping it in sight while you align your boat and match its speed (especially if it is weaving) seems a whole 'nother problem.
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Well, for the purposes of a reload, you don't have to be under there for very long, and you don't have to be *RIGHT* underneath a ship, just close enough that the escorts can't effectively get to you.
If you had done your work correctly, you know the course and speed of the convoy, and unless they zig or the convoy breaks up, you know direction and speed of any individual ship within the convoy.
On considering this, though, I won't attempt it using the obs scope anymore (not that I commonly did it anyway), when I do it I'll do it by sound only. You should be able to tell when you are close enough by a rapid bearing change on the hydrophones, and you should be able to get close enough to avoid a destroyer attack by sound alone.