What is the cause of most fatal boating accidents?

As an AI language model, I don't have access to real-time information. However, the US Coast Guard's Boating Safety Division reports that the main contributing factors to fatal boating accidents include operator inexperience, operator inattention, excessive speed, equipment failure, and alcohol. Other factors may include hazardous water and weather conditions, boater behavior, and vessel strikes with other vessels or fixed objects. It is important to remember to always follow safety practices and boating laws to prevent accidents and ensure a safe and enjoyable boating experience.