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Motion Sickness, Heat Exhaustion, Heat Stroke:
Long exposure to sunlight, the constant movement of the boat, alcohol, waves, wind, and noise can produce nasty effects. Balance, co-ordination, reflexes, judgement, response time, vision and hearing may all be affected. This can not only reduce his or her ability to operate the pleasure craft, but make [him] more likely to fall overboard - particularly frequent on small boats that don't have a Marine Sanitation Device (toilet).
Motion sickness, whether it occurs during a ride in a car, boat or aeroplane, it has the same cause;
the brain receives two mixed messages. (1) The eyes do not perceive movement, (2) the inner ear does. during a bumpy ride, be sure to look outside, ahead at the horizon if possible. That way the brain will expect the movement that the inner ear senses.
Drugs used to prevent motion sickness (i.e. Dramamine) must be taken about 1 hour before travelling. Avoid alcohol, sedatives or tranquilizers. If it gets too hot, most of us will simply stop the boat and jump in for a quick swim. But infants and the elderly don't often have this option. Heat Exhaustion therefore strikes this age group most. Provide plenty of water, sports drinks and salty snacks. Sunscreen, sunglasses, broad rimmed hats, and long-sleeved garments are a must. You want to keep all your guests comfortable, so have a bucket or basin onboard as well, to cool feet or moisten hot skin with a splash!
On hot humid days, sweating doesn't cool the body very well. Heat Stroke may occur and it's a life-threatening emergency. Symptoms may include unconsciousness, hyperventilation, a markedly abnormal mental state, dizziness, confusion, and hallucinations. Call for medical help immediately, and follow their instructions until paramedics arrive!
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