The initial shock can severely strain the body and may cause instant cardiac arrest. Disorientation may also occur. People have been observed thrashing helplessly in the water for 30 seconds or more before they were able to get their bearings. In addition, immersion in cold water can quickly numb the extremities to the point of uselessness. Cold hands may be unable to fasten the straps of a life jacket, grasp a thrown rescue line, or hold onto an overturned boat.
Proper preparation is important when boating on cold water.
Dress properly for the cold. Several layers of light clothing offer better protection than a single heavy layer. Always wear a life jacket. It is extremely difficult to put one on in the water. Should you fall into cold water, try not to panic.