Which four items are essential to include in carry-on luggage when sailing?

Including a passport, credit cards, charter documents, and prescriptions in carry-on luggage when sailing is critically important. The passport serves as your primary identification and is necessary for travel, especially if you're sailing to international destinations. Credit cards provide a means to pay for expenses, whether in port or in case of emergencies. Charter documents confirm your reservation and details about the vessel you are renting, which are essential for boarding and ensuring you have the correct boat. Prescriptions are vital for maintaining health, particularly for individuals who rely on specific medications that may not be easily available at their sailing location.

While the other options contain items that may enhance your sailing experience or provide comfort, they are not as fundamental for entering and participating in the sailing trip itself. Extra clothing, sunscreen, sunglasses, and a camera offer comfort and enjoyment but do not pertain to essential travel requirements. Similarly, maps, books, snacks, and water bottles can be useful but are not critical for initial travel and identification purposes. Fishing gear, safety equipment, tools, and a first aid kit certainly contribute to safety and preparedness while on board, but they are typically not items you would carry with you rather than store on the boat or in your gear.