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Old 01-02-2008
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I agree with Dog that head is important, only IIRC 40% of body heat is lost through your head, not 60%.
Since head is perhaps about 10% of surface it really does not matter if you loose temperature 4 time faster or 6 times faster - it i important to remember to protect hour head.
Dog, As I am not sure in my number - could you provide your source - I do not have the book here, but I think 40% is from a diving school and was consistent with my previous knowledge from scouts and climbing.
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Beneteau Oceanis 473

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finished cruising after two years.
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