Get closer
Visability is the reason your red marks vanish. The crew are losing sight of the enemy.
You didn't say if you are submerged, but I'm guessing you are surfaced.
If visibility is bad for you, it is too for them. You can approach closer.
You will likely want to fire salvo in bad seas. Single shots would have lower chances to hit a bouncy target.
You can use the pencil tool to put marks on the plot where you do spot ships. You can also put marks at the end of those black lines, which represent the sound contacts. (weird on the surface in stormy seas to hear them!)
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