They call it liquid crystal displays for a reason gents.....And the liquid inside laptops, gps, tvs, and anything in starts to freeze at around -30 or so.
My laptop froze in Fairbanks in my truck at around 50 below or so one night when I forgot to bring it in to the hotel like a idiot. It also ruined my screen on my CD player. Do what you want, but they do freeze and that wrecks them. It probably doesn't get cold enough in the lower 48 or even SC Alaska to really worry about it.
However, I'm not taking any chances. If it is seriously cold out, and the boat is out, then anything with an LCD comes out. I'm not learning that again.....