My boat is in the water year round and being in NC, I'm not planning to winterize anything in the bilge (engines, genset etc) I'm not sure if I need a heater or not either, its rare to have an extended period in the 20's on our coast and I'd imagine the water temps stay above 40* all winter. What I would like to do though is find a thermometer that can be left in the bilge with the ability to check the temps over the marina's wifi network. Does such a thing exist? If temps get too low in the bilge the first night that it dips below freezing, I'll at least know I need to do something else. Thanks SB