Sea Sickness on a Blue Cave Tour: An Honest Guide

On a typical day, about one in fifteen guests on the Blue Cave tour feels some degree of seasickness. Of those, most have a mild queasiness that passes once we reach the first stop. A small minority — maybe one in fifty — get genuinely sick.

These numbers go up when the sea is rougher. On a day with a strong Maestral or borderline-Jugo conditions, the ratio can be one in eight feeling unwell. On glassy mornings, it can be zero.

The ride from Split to Biševo is about 2 hours covering 90km. The boat does 25 to 30 knots. On a flat morning, it feels like a slightly bumpy car ride. On a wind-chopped afternoon, it feels like riding over a series of speed bumps at speed — not violent but rhythmic.

The return ride is often choppier than the outbound. The Maestral builds through the day, so a glassy morning becomes a windy afternoon. We plan around this when possible, but some days the return is just bumpier than the outward.

Inside the cave, on the rowboat, motion is minimal. Around the swim stops (Stiniva, Budikovac, Pakleni) the boat is stationary and there is no motion. The motion is concentrated in the two crossings.

Take a motion sickness pill an hour before departure if you have any history of seasickness, motion sickness, or are unsure. Dramamine, Stugeron (cinnarizine), or natural options like ginger root are all effective for most people.

If you have never tried them, do a test run before the trip. Some people get drowsy on Dramamine. Some get nothing on ginger. Knowing your body's response avoids surprises.

Scopolamine patches (behind the ear, 8 hours before) are the strongest option and are excellent for severely susceptible people. Available by prescription in most countries.

Middle of the boat, lowest deck. The bow rises and falls most. The stern bumps. The middle moves least. Stay seated and avoid the high deck during the open crossings.

Face forward. Watching the horizon helps your inner ear sync with the visual motion. Reading or looking at your phone makes seasickness worse — much worse.

Stay outside if possible. Fresh air and a horizon view help. Enclosed cabins on speedboats are the worst place to be.

A light breakfast — toast, banana, plain yoghurt — is better than no breakfast. An empty stomach makes seasickness worse, not better.

Avoid greasy or rich food. The bakery croissant is fine. The full-fat eggs Benedict is asking for trouble.

Coffee in moderation. A single coffee is usually fine. A double espresso with two pastries on an empty stomach is not.

Sip water continuously through the day. Dehydration mimics and amplifies motion sickness symptoms.

Tell the crew immediately. We have ginger, water, and the experience to know what to do. There is no embarrassment — we see this every week.

Move to the back of the boat, sit on the outer deck, face forward, breathe slowly. Cool air on your face often helps.

Do not look at your phone. Do not read. Focus on the horizon.

If you do throw up — over the side, downwind. The crew will help you. You will feel better afterwards and the rest of the day usually works fine.

We check the forecast the evening before every tour. If conditions look rough, we tell guests. Some choose to take the tour anyway with pills, some reschedule.

Honest weather conversations are part of what we do. If you message us the night before and ask "how is the sea looking", we will give you a straight answer.

If you get violently seasick on ferries or in cars on winding roads, the Blue Cave is probably not for you. Choose the Blue Lagoon and Trogir half-day instead — same beautiful day, calmer protected water, four hours instead of ten.

If you are pregnant, we do not recommend the Blue Cave. The motion and the long crossing are not appropriate.

If you have a recent ear or sinus infection, the speed and motion can be uncomfortable. Wait until you have recovered.

Further reading: for follow-ups, the what-to-pack guide, the what-to-wear by month piece, the Blue Cave weather reschedule explainer, and the Blue Lagoon vs Trogir half-day comparison are the right next reads. The calmer alternative is /tours/blue-lagoon-trogir-tour, the cornerstone day at /tours/blue-cave-5-island-tour.