Jetfoils like the Kumejima Ocean Jet's "Tsumugi" are significantly less prone to causing seasickness than conventional ferries. The vessel rides on underwater wings (hydrofoils) that lift the hull above the water surface, eliminating most wave-induced rocking. Passengers on Japan's other jetfoil services (Tokai Kisen, Sado Kisen) consistently report minimal motion. Tips: take seasickness medication 30 minutes before boarding if sensitive, choose a middle seat, avoid reading during the ride, and eat lightly beforehand. The 70-minute journey is short enough that most passengers experience no discomfort.
*Photos are for illustrative purposes only
One of the most common questions about the Kumejima Ocean Jet is whether passengers will experience seasickness. The short answer: jetfoils are among the smoothest vessels on the water, and the 70-minute journey is short enough that most travelers will have no issues at all.
Why Jetfoils Are Different from Ferries
A conventional ferry sits in the water and rolls with the waves. A jetfoil operates fundamentally differently — at cruising speed (about 80 km/h), underwater wings generate lift that raises the entire hull above the water surface. This “flying” state means waves pass beneath the vessel without transferring motion to passengers. It’s similar to the difference between driving on a bumpy road versus flying above it.
Practical Tips for Sensitive Travelers
Even though jetfoils are smooth, some travelers may still feel mild discomfort during takeoff/landing phases (when the hull is still in the water) or in rough conditions. Recommended precautions: take motion sickness medication 30 minutes before boarding, choose a seat in the middle of the vessel (least motion), avoid looking at screens or reading, eat a light meal beforehand (not too full, not empty), and stay hydrated. The 70-minute duration is mercifully short compared to the 3.5-hour ferry alternative.
FAQ
Q: Is the jetfoil smoother than a ferry?
A: Yes, significantly. The hydrofoil design eliminates most wave-induced motion that causes seasickness on conventional ferries.
Q: Should I take seasickness medicine?
A: If you’re prone to motion sickness, take medication 30 minutes before boarding as a precaution. Most passengers on jetfoil services report no need for it.
