Precisely. As a matter of fact,rather than mess around with some marginal plastic/mylar contraption, squirrel away a decent, compact sleeping bag so that you can spend a night out in relative comfort. A good down bag that compresses small is not cheap, but then neither is a snowmobile. A bag, shelter material or tent, and the means to make a fire, along with a decent FAK, and you can be comfortable while a response is made to your PLB signal.
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Geezer in Chief