From the Virginia Department of Wildlife Resources:
Everyone knows you shouldn’t drink and operate a boat. However, some boaters may forget or disregard the effects of prescribed medications combined with a marine environment. Lack of shade and over-exposure to the sun and heat along with ever-changing water conditions can bring on dehydration, dizziness, and heat exhaustion. Drowsiness or confusion will impair the ability to operate a boat safely much like too much alcohol. Remember to always be aware of the condition of yourself and everyone else onboard. #boatsafe