1.l Once the allies had airborne centimetric radar (in 1943) they could and did hunt for
surfaced subs at night. Later they could detect your snorkel.
2. 15 m/s is the same as 54 kph, or 35 knots or so. Recall that's wind speed on the ground:
if you are in the air the ground doesn't matter much.
3. If you are talking about GWX, I'd have to agree as the escorts seem almost psychic.
I had one detect me at 150 meters silent running (without having any reason to suspect
I was there).
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