DD,
An idea to bounce off of you. If you set these bouys to the sea floor (or give them a parent object that's anchored on the bottom) I've found a 'FastGenHeightControl' that controls the height of items in relation to the water. Once you attach this 'FastGenHeightControl' to your object the y position doesn't matter anymore (just set it to 0) as the parameter 'FloatingHeight' takes care of this....the good (or bad) part is if there are waves it will bob up and down keeping the same 'FloatingHeight' to the water (FloatingHeight can be negative also!). Now to further this another parameter can be added that can actually make the object move (x position) in waves, what I can do is basically trick the game engine into thinking that the object is moving when it really isn't (in waves that is). I don't know what you modeled these off of (a ship, a sub, ??) but just throwing some ideas out there.
Racerboy
