@Panthercules,
1.5 - 2.0 knots is required for "proper" depth keeping in GWX.
"All stop" at various depths does indeed produce the behavior you discuss.
Using the "A" (maintain current depth key) "releases" the U-boat from its current set of orders... so the process starts again concerning depth.
Concerning its impact on gameplay... it is dependant on the circumstance.
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