A typical boating day in the summer causes your body to generate a large amount of heat. Sitting exposed in the sun increases your body heat. As you ride in a boat, your body automatically adjusts to the changing position of the boat. The exertion of this constant adjustment increases body heat.
The way the body rids itself of increased heat is by sweating. Increased sweating will cause dehydration if fluids are not replaced. Dehydration will make you more fatigued and more at risk for a boating accident.
The best way to minimize the risk of dehydration is to drink plenty of water—before, during, and after any water activities. A good rule of thumb while you are boating in warm weather is to drink some water every 15–20 minutes.
Besides thirst, other signs of dehydration are a dry mouth, sleepiness, irritability, weakness, dizziness, and a headache. The first thing you should do if you experience any of these symptoms is to drink plenty of water. If possible, get out of the sun and rest. Serious dehydration may require medical attention.