If really big waves are a priority, go get this free prop in obj format.

http://www.turbosquid.com/3d-models/free-obj-mode-ocean-sea-wave/629015

It offers huge waves that would normally overwhelm Poser's displacement system, no matter what the shape.

Here I combine it with my wave shader for the smaller waves.

The white box is 50 high and wide, 250 feet long.

The submarine is a similar size but harder to see.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)