When it comes to feeling seasick, you’re in good company—and famous company, at that. Historical sailors like Lord Nelson, Christopher Columbus, and Charles Darwin all reportedly suffered terribly from mal de mer.

When seasickness strikes, time slows down and minutes of suffering can feel like an eternity. But why does our body react so strongly to rolling waves? More importantly, how can we use science, natural remedies, and practical onboard protocols to regain our balance?

Here is everything you need to know about why motion sickness happens, how to prepare, and what to do on board, including the exact kit we keep on board all our charters.

The Science: Why Do We Get Seasick?

At its core, seasickness is a sensory mismatch. Your brain relies on three key internal systems to figure out where you are in space:

The Visual System: Your eyes tell your brain what appears to be moving and what appears to be stationary.

The Vestibular System: Your inner ear contains fluid-filled structures that detect acceleration, rotation, pitch, roll, and changes in the position of your head.

Proprioception: Proprioception is your body’s internal sense of position and movement. Information coming from your feet, ankles, joints, muscles, and physical contact with the surfaces around you helps your brain understand where you are and what your body is doing.

When you’re on a boat, these three systems get confused. If you’re down in the cabin or looking at a deck wall, your eyes tell your brain, “We are standing still.” Meanwhile, the fluid sloshing in your inner ear and the shifting weight in your feet scream, “We are moving!”   Knowing your brain is just trying to protect you makes it easier to work with your body to calm the alarm system.

Why Look at the Horizon? (How We’re Hardwired)

The classic advice to stare at the horizon isn’t just a trick to distract ourselves. It’s how our biology naturally recovers its balance.

As humans, we are deeply hardwired to rely on our vision to confirm how our bodies are moving through space. When we look down at a boat’s deck or cabin walls, our eyes see an environment that moves with us, telling our brains, “We are standing still.” Meanwhile, the fluid in our inner ears feels the waves pushing us around. That sensory mismatch confuses our nervous system and triggers motion sickness.

The horizon is the one thing on the water that does not move with the boat.

When we lock our eyes on the stationary line where the water meets the sky, our brains finally receive a visual input that matches what our inner ears are feeling. Our eyes see the vessel rolling against the distant background, our bodies feel the movement of the waves, and because both senses are suddenly telling the exact same story, our nervous system stops panicking and our stomachs settle.

We want to look forward in the direction the boat is traveling (or as close to dead ahead as possible). Facing forward aligns our eyes with our body’s natural direction of motion. As the boat cuts through the water, our visual field and our physical momentum move in the same direction, making it much easier for our brains to process the movement and settle down.

Prep & Snack Protocol: What to Eat and Avoid

Whether you’re heading out for a day of sailing, kayaking, or motor boating, what you put in your stomach before and during your trip makes or breaks how you feel.

When prepping for a day on the water, your pre-sail breakfast should focus on gentle, slow-burning energy. Stick to complex whole grains like oatmeal or whole-wheat toast, light proteins such as hard-boiled eggs or low-fat yogurt. Acid-neutralizing fruits like bananas and green apples are great for keeping blood sugar stable and soothing the stomach lining. Stay far away from heavy fats and greasy breakfast meats, as they take forever to digest and can easily trigger motion sickness once the boat starts rolling.

When packing lunch and snacks for a day on the water, aim for simple, easily digestible foods that won’t weigh you down. Opt for lean turkey or chicken wraps, cold pasta salad, and fresh finger foods like green apple slices, cucumber sticks, or seedless grapes.

And keep a dedicated stash of emergency nausea foods like plain saltines, oyster crackers, ginger chews, and cold cans of ginger ale. These dry starches and ginger treats act as acid absorbers and stomach soothers to nibble on as soon as anyone starts feeling a hint of motion sickness.

Preparation: Before You Leave the Dock

Prevention is far easier than a cure. If you know you’re prone to motion sickness, build a biological cushion 24 to 2 hours before casting off. Make sure you are hydrated and eat to maintain blood sugar levels. Dehydration and low blood sugar amplify nausea. Eat light, low-fat meals.

Clinical research shows that taking high-dose Vitamin C roughly an hour before exposure to motion acts as a natural antihistamine, suppressing stress hormones and significantly reducing nausea. (Fun fact: Studies showed Vitamin C was particularly effective for women!)

Mixing two packets of Emergen-C Original Formula Powder into water gives you a 2,000 mg dose of Vitamin C along with essential electrolytes to lock in hydration.

Essential oils are a fantastic tool for tackling the seasickness.  Two of the best are peppermint  and lemon, working on two separate systems. Peppermint acts on the gut, using menthol to physically relax churning stomach muscles. Lemon works on the brain, using limonene compounds to quiet the central nausea signals sent to the brainstem.

Bringing a portable essential oil inhaler or small vials of pure oils in your pocket keeps relief within arm’s reach on deck.

Acupressure is one of the few natural remedies fully embraced by Western medicine and used everywhere from hospital recovery rooms and pregnancy wards to NASA spaceflight programs. Pressing the P6 point directly stimulates the median nerve in your arm, sending electrical signals straight up to the brainstem’s nausea center to suppress the vomiting reflex and restore normal stomach contractions.

Locate Your Acupressure Points: Whether you’re lining up an acupressure wristband or applying manual thumb pressure during a sea outing, locating and pressing the P6 point takes just two simple steps:

• • Step 1 (Measure 3 Fingers Down): Flatten your palm facing up. Place the first three fingers of your opposite hand across your wrist, starting right at your wrist crease.

  • Step 2 (Pincer Grip & Massage): Place your thumb on the point directly below your index finger, centered between the two large tendons. Apply firm pressure and massage the point for two to three minutes. The pressure should be firm, but not painful.

Dress in Layers & Wear Polarized Sunglasses:  It’s important to be comfortable. The weather on the water can change quickly, especially in places like San Francisco Bay, where crisp winds and sudden fog pockets can drop the temperature fast and create micro-climates so it seems you re always adding or subtracting clothing for comfort. Becoming chilled or constantly squinting against water glare places unnecessary stress on your body, making you far more vulnerable to feeling queasy.

Dressing in easy-to-adjust, windproof layers keeps you warm and comfortable, while polarized sunglasses eliminate eye strain so you can relax and enjoy watching the horizon. Bring a warm jacket or fleece, something with a hood is also comfortable as it’s easily removed as needed. You know your body and its temperature sensitivities.

Orienting Your Body Upon Arrival

The moment your feet touch the deck, take five minutes to orient your nervous system to the vessel’s movement before you ever leave the slip. One of the most important things to do is to stay above deck in the fresh air. Avoid going straight below into the cabin. The open horizon and fresh breeze give your visual system an immediate baseline.

If you start feeling queasy, your natural instinct is to lie down in a quiet cabin below deck. Don’t do it! Going below cuts off your view of the horizon and traps you inside a moving frame of reference, which instantly worsens the sensory mismatch in your brain.

Unless you are going below for a quick second to grab gear or use the head, stay above deck in the fresh air, keep your eyes on the fixed horizon, and let the sea breeze cool your skin. Fresh air and a open view are your best natural medicine!

Getting Your Sea Legs:  Getting your “sea legs” isn’t just old maritime wisdom, it’s real neuroscience. The moment you get underway and hit open water, take 5 to 10 minutes on a safe spot on deck or in the cockpit to let your nervous system calibrate to the boat’s motion:

• Keep Your Knees Soft: Stand on deck with your feet slightly wider than shoulder-width apart and keep your knees micro-bent—never lock your joints!

• Hold On to a Secure Point: Hold a firm, fixed part of the boat like a handrail, shroud, or cockpit table. Gripping the boat sends immediate tactile feedback (proprioception) through your hands straight to your brain, confirming exactly how the vessel is moving underneath you.

• Sway Like a Shock Absorber: Instead of fighting the motion and standing rigid, let your ankles, knees, and hips sway naturally with the waves. Yielding to the boat’s rhythm shifts your body’s spatial awareness down into your physical joints, taking the strain off your confused inner ear.

Spending just 5 to 10 minutes intentionally standing on deck as you get started gives your body the physical anchor it needs to adjust for the rest of the voyage.

Emergency Action: What To Do When Queasiness Hits

The moment you start feeling that subtle “green” feeling, heavy eyelids, or first wave of nausea coming on, this is the very first thing you should do.

Get a Forward-Facing Fix on the Horizon

• Position Yourself Dead Ahead
  • Step out into the fresh air, sit securely in the cockpit, and face straight forward in the direction the boat is traveling. Where you look matters just as much as what you look at. Looking off to the side (port or starboard) makes the horizon tilt up and down like a chaotic seesaw, which can make your head spin faster. Facing dead ahead aligns your vision with your body’s natural forward momentum, making it dramatically easier for your brain to process the motion.
• Lock Your Eyes
  • Pick a clear, unmoving point on the horizon straight out in front of you – a bridge, building, landmark, or the crisp line where the water meets the sky. Keep your eyes frozen on that single target, letting your body roll naturally with the vessel beneath you.
• Recalibrate Your System (Nod & No):
  • While keeping your gaze locked 100% on that forward horizon point, slowly turn your head side-to-side (as if saying “no”) for 20 seconds, and then up-and-down (as if saying “yes”) for 20 seconds.

• • Why This Works: Locking your eyes on the horizon while moving your head activates your body’s natural image stabilizer, automatically keeping your gaze locked on target as your head moves. This forces your eyes and inner ear back into sync, instantly re-centering your balance. By proving to your brain that your vision is steady, you shut down the internal panic alarm and settle your stomach.

Engage Onboard; Take the Wheel Or Lock Your Eyes On A Static Landmark:

Getting behind the helm and driving the boat combines three powerful anti-nausea triggers at once. First, the wheel acts as a tactile anchor, physically grounding your hands to the vessel. Second, steering forces your visual focus outward toward the horizon, giving your brain a visual baseline to anchor to. Finally, driving unlocks motor anticipation because you are turning the wheel, your brain anticipates the boat’s motion before it happens, eliminating the sensory surprises that trigger a passenger’s nausea.

If you aren’t comfortable driving the boat, don’t worry, you can get those exact same brain-calming benefits by becoming the vessel’s official “Horizon Sight-Keeper.” Sit comfortably in the cockpit facing forward, pick a prominent landmark in the distance, and lock your gaze onto it. Looking down at the floorboards or cabin walls forces your eyes to see stillness while your inner ear senses rolling motion, creating a brain-scrambling conflict. Forcing your visual system to focus out on the open horizon proves to your nervous system that you are stable, safe, and in control.

More Support: The Aromatherapy, Acupressure & Breathing Sequence

Once you are situated facing forward, run through this quick three-step physical reset to hit your nausea from every possible angle:

Step A: The Aromatherapy Reset (15 Seconds)

Uncap your peppermint and lemon essential oil vials and hold them an inch or two below your nose. Take 3 deep, slow inhalations, alternating or combining the scents.

• Peppermint acts directly on the gut, its high menthol content serves as a natural anti-spasmodic to physically relax churning stomach muscles.

• Lemon acts on the brain, its limonene compounds stimulate the olfactory system to directly quiet the central nausea signals sent to the brainstem.

Step B: The P6 Acupressure Lock (2 to 3 Minutes)

Next, locate the P6 (Neiguan) acupressure point on your inner wrist—about three finger-widths down from your wrist crease between the two central tendons. Clamp your thumb firmly onto this point (placing your index finger on the back of your wrist for leverage) and rub in firm, small circular motions for 2 to 3 minutes per wrist. (See above Preparation Section for full How To)

Step C: Vagus Nerve Breathing

While applying wrist pressure, practice slow, rhythmic diaphragmatic breathing. Inhale through your nose for 5 seconds, then exhale smoothly through your mouth for 5 seconds (aiming for roughly 6 slow breaths per minute). This deep, paced breathing directly stimulates your vagus nerve, rapidly lowering your heart rate and shifting your entire nervous system out of “fight-or-flight” panic mode so your stomach can settle completely.