waterline shots are possible. 'vertical' movement is set by altering the range.
If the range to the target is 2000 m, set it slightly shorter. Its difficult to say how much because even with an exact range, movement of your sub caused by the waves will alter your shooting angle. You can actually see your gun barrel lift and lower. Try to fire when the barrell is at the same angle each time. This way, hopefully you can adjust your range setting to get the shots hitting the water several metres short - ensuring your shots hit just below the waterline.
Good luck, practice makes perfect (so they say!)
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