In addition to impaired judgment, which of the following is a common effect of alcohol on boaters?

Alcohol consumption significantly impacts physical and cognitive functions, and one of the common effects is slowed reaction time. This is especially critical for boaters, as the ability to respond quickly and effectively to changing conditions, unexpected obstacles, or the actions of other boaters can directly affect safety on the water. Alcohol impairs motor skills and delay in response time, which can lead to accidents or mishaps while operating a vessel.

In contrast, the other choices suggest improvements in abilities that are generally not consistent with the effects of alcohol. For instance, memory enhancement, increased vision clarity, or improved tracking abilities do not align with the well-documented detrimental effects alcohol has on performance and judgment. Therefore, recognizing that slowed reaction time is a key consequence of alcohol use helps to underscore its dangers in boating scenarios.