I will sometimes tape one of the disposable hand warmers to the GPS to keep it working. The disposable hand warmers need to interact with oxygen to work so do not seal it up with tape so that it can breath.
One quick question Packrat.
How do you keep them from getting wet?? The ones I have are almost like a tea bag sort of material which you could rip easily. With falling snow it seems that the snow would quickly melt all over the handwarmers making them useless.
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