I’m not a scientist either, BUT I took a couple of classes at a Holiday Inn Express. The whole water freezing at 32 degrees is misnomer. ALL water will turn from a solid (think ice here)to a liquid ABOVE 32 degrees.
Ben, The nav. card is absolutely AWESOME! Two weeks after we bought the central, I bought a north to use at Oahe. That card alone it possible to catch a Salmon!