Wristbands worked for my FIL fishing in Alaska. Strange thing was that he had them on backwards so the pressure point wasn't applying any pressure at all. Must have been his faith in the bands.
Whenever I've fished in the ocean or big water in this state I've made sure I never stare at the floor and concentrate watching shore or birds and constantly change my view and try not to stare at anything for any length of time. Has always worked for me.