Changes

Obviously the pumping systems should have excellent redundancy. You wouldn’t want water ballast on the wrong side of the boat at the wrong time.

A discussion of roll damping would be incomplete without mentioning [https://en.wikipedia.org/wiki/Paravane_%28weapon%29 paravanes] and flopper stoppers. Paravanes are long poles extended horizontally from the sides of a trawler, with winged paravanes that reduce the boat’s rolling inertia when underway.