Larger vessels absorb wave energy better, while smaller or high-speed boats generate rapid pitch and roll G-forces.

🚢 Mega Cruise Ship Advanced active stabilizers (Low Risk)

⛴ Passenger Ferry / Catamaran Moderate sway & dual-hull motion

⛵ Sailing Yacht / Monohull Continuous heel, roll & wind waves

🛥 Small Speedboat / Fishing Charter High-frequency choppy wave pounding

Wave period and swell height directly trigger visual-vestibular sensory conflict in the inner ear.

🌊 Calm Seas (< 1m / 3ft) Gentle glasslike water or bay cruise

🌊🌊 Moderate Swell (1 - 2.5m / 3 - 8ft) Noticeable rocking & ocean rolling

💨🌊 Rough Seas (> 2.5m / 8ft+) Heavy wind swells, pitch & heave

Your physical position relative to the ship's center of gravity drastically affects G-force exposure.

📍 Midship Lower Deck / Waterline Ship's true pivot point (Lowest Motion)

🏖 Open Main Deck with Horizon View Fresh air + clear visual horizon anchor

🛋 Inside Cabin / Closed Lounge (No Window) High sensory mismatch (Eyes see static, ear feels motion)

⚓ Bow (Front) or High Upper Deck Maximum vertical displacement & lever motion

Individual otolith organ sensitivity and past motion history determine your baseline vulnerability.

🛡 Iron Stomach (Rarely / Never Sick) High otolith adaptation tolerance

🤢 Moderate (Occasional Nausea in Cars/Boats) Sensitive under rough or choppy conditions

⚠️ Highly Sensitive (Prone to Nausea & Vomiting) Triggers rapidly without active countermeasures

Seasickness Risk & Susceptibility Calculator

Motion Susceptibility Score