Let me clarify the candle lantern as part of a hypothermia kit. First, I have two hypothermia kits. One is in my lifejacket and the other in my boat.
The lifejacket kit is basically just a space blanket and fire starter. It does not have a candle lantern. It needs to be as small as possible to fit in a PFD pocket.
On the boat I have a full kit including candle lantern, poncho liner, and modified space blanket as described here: http://watertribe.com/Magazine/Y2002/M12/SteveIsaacMakeAHypothermiaKit.aspx and
http://watertribe.com/Magazine/Y2002/M12/SteveIsaacWhenGodsPlay.aspx
Please note that some of the stuff shown in these articles is a bit outdated now, but the basics are still applicable. Also, the idea of vacuum bagging the kit is really good.
Almost every year we have someone flirting with hypothermia and they still have their boat. For minor cases the best remedy is to setup camp and get into dry clothing, cook something so you can eat or drink hot food. For more severe cases the candle lantern, poncho liner, and space blanket can get you on the path to recovery enough to stop shivering - then you can setup camp. Of course all this depends on proper layering and so on.
I did this at a demo one time and it is a good exercise to practice this skill. Always have supervision when attempting this skill or any other survival practice.
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Dress yourself in your paddling or sailing attire including your lifejacket and have your full hypothermia kit handy.
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Jump into a cold swimming pool or wade into cold water and just float around until you start to shiver. At this point you are at or very near the first stages of hypothermia.
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Get out of the water and find a spot that shields you from the wind and will allow you to lean back against it if possible - maybe a tree or rock or even your boat.
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Take off your lifejacket and put your modified space blanket on, then your poncho liner, and if raining your poncho goes on.
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Lay your PFD on the ground and sit on it.
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Light the candle lantern and place it between your legs in the tent-like area created by your raised knees. BE CAREFUL. Some space blankets are flammable. The candle lantern incloses the flame, but you still have to be careful.
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Kind of open the area around your neck to allow the steam to escape.
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When you stop shivering and your poly layer is almost dry, you can setup camp and get something hot to eat and/or drink.