The easiest way to overcome the wave problem is raise your keel depth somewhat. At the moment I cannot remember what the average periscope depth is for a u-boat. But, let's just say for grins that it is 15m, raise your keel depth to something like 12m or 13m. Remember one thing if you use this method though, you are exposing more of your conning tower by doing this and that makes it easier to be spotted.
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