Although heatstroke is most common in the hot summer months, it can happen any time. Water's reflective qualities actually intensify the power of the sun, so even if you're boating on a balmy 70-degree day, you can run into problems.

There are a number of preventative measures you can take.

Dress in lightweight clothing that is also light in color. Dark colors tend to trap the sun's energy, light colors to deflect it. Wear a hat or stay under the bimini–or even an umbrella. (Additional tip: Cool off with a water mister or fan. A simple hand-held, battery operated unit can do the trick.)

Drink water and juice continuously, whether you're thirsty or not, and avoid alcohol and caffeine–including soft drinks containing caffeine, which dehydrate the body. (Additional tip: If you're thirsty, it means you've waited too long to re-hydrate. If you note that your urine is yellow, you have not been drinking enough. In fact, it's a good idea to start your fluid intake before getting into the sun.)

Eat small meals frequently. You need to avoid foods high in protein because they actually increase metabolic heat. Take no salt tablets whatsoever unless your doctor has recommended you do so.

Avoid strenuous activity if at all possible. If not, undertake it during the coolest part of the day, which is generally in the early morning hours.

If you're physically active and the day is warm, take breaks to a cool, preferably shady spot. Be sure you allow enough time to cool down before resuming activity. Also watch out for others in your group who may show signs of heat-related difficulties. (Additional tip: Children and the elderly are at highest risk for heat-related maladies because their bodies don't regulate heat as well as other age groups. Pay particular attention to their fluid intake.)

Many of these pre-emptive suggestions came from the Red Cross. You can read others on their website.

– Linda Hoff