New plugin available for Carrara 8.x: 
Brianorca Ocean 

http://www.brianorca.com/CarraraPluginOcean.html
It can cover a larger area than the built-in Carrara Pro ocean, using about the same memory, and maintaining fine detail in the center.

Uses different grid resolution for render and preview, speeding you work.

Float modifier to make you boat float.

Available for $15