Why does the temperature scale change from day to day?
The temperature / color scales has always been one of our most difficult issues. We actually go to great lengths to be able to vary the temp scale on a chart by chart basis. In order to best show the water structure and breaks, our goal is to use the narrowest range of temperatures possible (to a point). With a wider range of temperatures many of the more subtle temperature changes just fade away. The problem we run into with trying to set a fixed temperature range is that we have a substantial change in temperatures over the course of a single day, particularly from a night time shot to a day time shot. We can easily have a 2-3 degree change, or even more. So if we hold the temp scale steady, we end up with a big change in the colors used for the same body of water from one chart to the next. The alternative then is to try to get the colors to hold somewhat stable, and the way to do that is to tweak the temp scale each time. If we were to just fix the scales and be done with it, it wo