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Dead is dead in my book. Probably more likely to get sick from CO poisoning over the course of a day though.
get a digital co detector they are cheap now you can watch the numbers and apply it
How bout bringing a canary with you? Nah he'd probably freeze first,..And then there is all the stuff I haul out to fish,..a game warden once said that he never saw a single guy that had so much stuff hauled onto the ice. (on my modified sled)