Do you know this? You are just enjoying a nice sailing trip, a deluxe cruise or a ride on a ferry to the next island - but all of a sudden, the waves are getting bigger and the sea turns rough. In the very next moment, you are getting this disgustingly "slack" feeling in your stomach and you feel dizzy. Then you should try this app. The camera view is enhanced by an artificial horizon which stays at its actual place despite of the swings. With the help of this reference point you will hopefully feel much better very soon.