This is my first experience with the XXI, so I defaulted to 1 - 2 knots silent running the same as I do in the other boats. I wasn't actually aware that I could effectively double that and still remain silent.
When I gave a quick burst up to 5 knots to reduce the downward drift, the escorts seemed to get a little excited and started pinging me. I stepped back to 2 knots to try and lose them again and they lost the contact. Perhaps that was just a coincidence
Just for giggles, I restarted the career and tested depth keeping at various depths and speeds and found I had no trouble maintaining whatever depth I selected. So, I assumed it was just a one-off occurrence. Then I ran into another convoy and the original scenario repeated itself (I was watching for it this time, so I managed to get away without getting crushed.)
So, it seems to happen only when I'm near other ships at a depth of 100+ meters travelling at 1 - 2 knots. If there are no contacts in the area, I can dive deep and move slow without a hitch. That's sure gonna make convoy attacks interesting this late in the war. I'll keep playing around and see if I can keep reproducing it on a consistent basis.
Chor
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