This Cruise Ship Motion Forecast is an indicator of how much motion a contemporary cruise ship may experience. The forecasts convey significant wave height (in feet) which represent the average height of the highest waves. Cruise ship motion also depends on wave period (frequency), wind direction, ship design, local weather conditions, and other factors. Use the map is at your own risk. Do not rely on the map for navigation, safety, or health decisions. Sea conditions are subject to change. Individual experiences vary.