Operator fatigue can be caused when a boater has been on the water for a long period of time, exposed to the sun and/or the motion of the boat. The operator may find it hard to keep a proper lookout and react slower in situations when fatigued.

Physical exercise such as tubing, water-skiing or operating a PWC will increase the rate at which fatigue sets in.

The consumption of alcohol or lack of fluid intake, especially water, will also increase the rate that fatigue sets in.

Many causes of fatigue can be treated with rest. To keep safe, always take turns at the helm while boating and keep well hydrated.