There is no rule for seasickness: it affects everyone, on one navigation and not on the other, but nevertheless certain elements can favour it. Here are the rules or tips to follow to try to maximize your chances of not getting seasick. You should also know that often it is the first 48 hours of sailing that are critical. After this time, you're less prone to seasickness.
The rule to be respected to prevent seasickness is undoubtedly to be in good physical and mental shape. A rested, cheerful, physically fit person who has eaten well is less prone to seasickness.
The 5 F rule
Cold, Hunger, Fatigue, Fear and Foif are five elements that are well known to sailors. Favouring seasickness, it is advisable to respect them in order to put all the chances on your side.
F for Cold
The cold is conducive to seasickness. It is therefore advisable to cover up well before setting out to sea. Whether you are sailing for a few hours or for a long crossing, dress warmly. Use technical clothing: an undercoat to wick away moisture, fleece to keep warm, and oilskins to protect against wind and sea spray.
F is for Hunger
Having a full belly while sailing helps to combat seasickness. An empty stomach can cause nausea and give way to seasickness. It is important to eat well and snack regularly, especially if it is cold and you are expending calories through increased physical activity. Bananas, cereal bars, dried fruit or sweets will be your allies.
F is for Fear
Fear can paralyze you and cause you discomfort while sailing. Find out about the navigation program, prepare the questions you want to ask the skipper. It is important to relax and anticipate all your anxieties. If you encounter slightly strong weather conditions, think positive and don't lock yourself into a distress linked to bad thoughts (we're going to sink, we're going to capsize...).
F is for Fatigue
Fatigue is one of the elements that causes seasickness. Before leaving on a trip, it is important to rest well and arrive in good shape on the boat. Naps can also help you recharge your batteries.
F is for "Foif" (thirst for water :-)
Remember to keep yourself well hydrated before and during your stay at sea. Drinking water helps you fight thirst and prevents seasickness. The wind, sea spray and sun dehydrate you and you should force yourself to drink. Choose small amounts regularly, rather than large amounts. Some people may enjoy sweetened drinks, but hot drinks such as coffee or alcohol should be avoided.
In conclusion, it is important to be well covered, with a full belly (but not to make yourself vomit), to have drunk well (not alcohol) and to think positive.