: From USCG RESCUE AND SURVIVAL SYSTEMS MANUAL, pg 2-23:
: "Contrary to popular belief, the survivor should not swim
: around in efforts to keep warm. This will only increase the rate
: of heat loss and speed the onset of hypothermia."
: http://www.uscg.mil/directives/cim/10000-10999/cim_10470_10f.pdf

: Though a lot of the USCG manual pertains to liferaft conditions, it
: does make for an interesting read........

It bothers me that every PDF I have ever tested eventually rolls me over and puts me face down if I relax. I can easily float for hours without a PDF and without working, and have even slept afloat so what use is it?