Yes, its exactly the "Seabed Repair Mod" from Mikhayl. And for sure, is just possible to interpret the bug as an unkown uboat damage by heavy session of depth charges...but i find it a bit frequent now that I know how to reproduce it for tests...I'm almost sure that what I found was an unexpected bug of the Seabed Repair mod that probably neither Mikhayl saw it. Anyway the more important is that it is easily fixable as I wrote above.
For 1WO I suggest in 1000 steps for long distances, or better: isn't possible to make this estimated distance error a bit random? (as probably in RL?) The same idea (bit random error) could be applyed also for the WP solutions readings?
And finally the delay will be - even if the unique modification for WP readings solutions - a awesome addition. I totally agree with Mixale about it.