If rolling waves are not kind to your stomach, try eating pure ginger. Ginger has been found to dramatically reduce nausea and vomiting. It soothes a queasy stomach and has no side effects. You can get ginger in pill, tablet or powder form. Even pure ginger candy should do the trick. It is recommended that you take between 1-4 grams of ginger for maximum benefit. You may want to begin taking it 12-24 hours before you board the boat.