Becoming seasick is an extremely remote possibility. The number of people who have become motion sick is less than five (over 25 seasons and thousands of guests.) The waters are generally calm during the summer months and on the days when the wind and tide do make the water choppy, the motion of the boat is not of the kind that induces motion sickness. The catamaran is exceptionally stable both at rest and when moving. If you are concerned at all about this, the best course of action is to take a tablet of a medication called BONINE or non-drowsy DRAMAMINE, the night before or an hour before your tour and you should be protected from motion sickness during the day.