What indicates that a boat operator is impaired?

The indication that a boat operator is impaired primarily involves signs of physical incoordination or slow reaction times. These symptoms suggest that the operator may be under the influence of alcohol, drugs, or fatigue, which can significantly impair their ability to operate a vessel safely. Coordination is critical for navigating, controlling the boat's speed, and responding to various environmental factors. When an operator demonstrates these signs, it raises serious concerns about their capacity to make sound decisions and execute safe boating practices.

The other options do not directly address impairment. Reduced boat speed may occur for various reasons that do not necessarily indicate impairment, such as unfavorable weather conditions or the operator's choice for safety. Excessive noise from the engine could be due to mechanical issues rather than operator impairment. Lastly, an inability to read navigation signs might stem from a lack of experience or knowledge rather than impairment. Therefore, the presence of physical incoordination or slow reaction times is a clear and direct indicator of impairment, highlighting the importance of assessing these factors in boating safety.