If I could put it this way, the only concern is with a vessel that has, as Mr. Nash said, high windage, that has been perhaps made higher than a traditional type of vessel or that has been made wider. In fact, being wider gives it more stability, but then because the vessel becomes very stiff, they will put on an anti-roll tank. You have to then know exactly how to operate that anti-roll tank. Sometimes as a misnomer they call it a stability tank. It's not a stability tank; it's a convenience so that the vessel will roll more smoothly. That creates the need to operate the vessel more carefully and know exactly what is happening.
So that becomes a risk factor. What I would simply say is that that kind of vessel requires an inclining test to be done and requires a stability booklet. The master must have on hand information on the capability of the vessel. It's as simple as that.