We took the ferry over several years ago and my wife took some no drowsy Dramamine as she gets seasick. .long story short she didn't feel sick and wondered why everyone that passed by her asked if she was ok. I was out on the deck for the sea breeze and she was inside, when I went to see her she was white as a ghost and dripping from sweat but felt OK. It was more than choppy going over but much calmer coming back.