What do you call the disorder many people feel when they travel by boat?

The disorder many people experience when traveling by boat is called seasickness. It occurs when there is a mismatch between the sensory signals received by the brain, particularly between the inner ear, eyes, and deeper body parts. Symptoms can include nausea, dizziness, and vomiting. This condition is a type of motion sickness and can often be alleviated with various remedies or medications.