I'm sure this is a simple fix but I can't get it to show an image on 2d sonar with the total scan. It works on down and side image but 2d is just a blank white screen. Any suggestions? Totals and is the only transducer connected. Which leads me to another question. At the console I have another 9 with AI 3n1 and a skimmer. How do I set it so it reads depth while moving from the skimmer and reads side/down/ 2d from the 3n1 while fishing? Or will I just have to such back and forth?