I just watched Matt's vlog about sailing on older ships. I have only sailed on voyager, freedom and oasis class ships. I know that these ships are amazingly stable because of the active stabilization, big wings that stick out underwater to counteract the rocking of the ship. Are the older ships, radiance and vision class, actively stabilized like the newer ships? If not, is there a problem with excessive rocking? I have been in fairly heavy seas (20 ft) in the newer ships with no nausea issues a