What is one of the primary causes of propeller strike accidents?

Operator carelessness is a primary cause of propeller strike accidents because it encompasses a range of risky behaviors and decisions made while operating a boat. When operators are not attentive or fail to follow safety protocols—such as maintaining a proper lookout, ensuring safe distances from passengers in the water, or being cautious around congested boating areas—they increase the risk of accidents significantly. This negligence can lead to scenarios where someone may inadvertently come into contact with the spinning propeller, resulting in serious injuries.

In this context, while high speeds, inexperienced passengers, and unfamiliarity with local waters can contribute to boating accidents, they do not specifically highlight the operator's direct actions that lead to propeller strikes. Carelessness directly connects to how well the operator is managing the vessel and the safety of others onboard or in the water, making it a crucial factor in preventing these types of accidents. Understanding the importance of operator attentiveness and responsible handling of the vessel can greatly enhance overall boating safety.