I am not sure what you are referring to XanderF, on the whole I find all of the water effects in SH4 are greatly improved over SH3 and very lifelike. I especially like the whitecaps. Spend some time on the bridge in stormy weather, you will see foamy water, whitecaps, etc., very nice. I havent noticed anything special about the water on the periscope.
As Silence pointed out, the only remaining issue is the waves breaking over the bow which should break up into foam, but presently comes in as a solid sheet. I presume its a limitation of the engine, but considering all the other improvements, its a minor point.
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