Perhaps they were just pinging around like the escorts of convoys do it ?
They can't do that at full speed, but if they were going at only 15kn it might be possible.
But still it would have been luck if you were not showing them your broad side.
Sounds strange alltogether.
I could imaginge that the SH3 engine is a little bit generic about that. That late in the war the DD's were such concious, experienced and well equiped that they had a high chance of detecting subs.
So they get your contact even if it seems unlogical, but it's perhaps a little randomized or cheated too.
This could simulate that u-boats were detected even if they didn't know why.
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