I have an electric heated vest I used when I rode motorcycles. It covers the body and arms and will keep me toasty warm on the coldest of days on a motorcycle. It has gloves that attach to it but they would be much to bulky to use while fishing. I have wondered if it would work well in a boat. I think it would take a pretty good size battery, perhaps one of the trolling motor battery class to work all day long. Of course days are not all that long during the winter months, but still and all I'm pretty sure it draws a lot of current. Its adjustable so as the day warm up, you could dial down the heat. I would love to hear from anyone else who has tried this.