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Heating packs
I think because these are sold in astronomy shops they could be considered as an aid to observing so I put this question in the equipment area but mod's move it if I am wrong.
Has any one used or recommend those heating packs that heat up and can then be boiled the next day for reuse? do they work very good? How long do they keep pumping out the heat? Are they worth getting for winter or more of a gimmick type thing?
I am thinking of getting some to keep my wife happy and warm in the caravan through winter why I am out observing. I will look at getting them as well if they work. Opinions anyone.
Matt.
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