Owing to a small bug in the original game, any attempt to alter the pre-set crash-dive depth, before the crash-dive has completed, results in the U-boat not levelling out properly.
This can affect depth-keeping properties - you may find you have to travel excessively fast to hold your depth steady.
This problem is particularly severe with the NYGM super-mod, where the U-boat is trimmed down anyway (that is, it has a tendency to keep sinking at very slow speed), but it also affects the stock game. Not sure about GWX, since the U-boat is trimmed up (has a tendency to rise) at very slow underwater speeds.
The golden rule: Do NOT change the depth of a crash-dive until AFTER the crash-dive has completed. As an alternative, just diving at flank speed and also pressing the 'D' key is nearly always fast enough, and does not cause the crash-dive depth-keeping problem.
If you accidently interrupt a crash-dive by changing depth, you can correct all the problems by returning to a depth above the crash-dive depth, then crash-dive again, allowing the U-boat to level out properly.
Stiebler.
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