What factor is used to determine if a speed is safe for your boat?

The safety of a speed for your boat is primarily influenced by visibility conditions. When operating a boat, being able to see clearly is critical for making safe navigation decisions. Reduced visibility can be caused by factors such as fog, rain, or darkness, making it difficult to see other vessels, navigational aids, and potential hazards in the water. In such conditions, it is essential to reduce speed to allow for adequate reaction time and to enhance safety for both the boater and others on the water.

While water current, wind speed, and the number of passengers also play important roles in safe boating practices, they do not directly relate to the visibility aspect of safe navigation. Water current and wind speed can influence stability and maneuverability, and the number of passengers may affect the boat's handling, but when considering safe speed specifically, visibility conditions are paramount.