I have 2 ?s. Does anyone have an idea what this is? And does anyone know of an problem with the 83khz on these units. I do a lot of vertical fishiing and when I have the 200khz on it shows the fish ID in orange like it is suppose to. But when I put the unit in 200khz and 83khz it only still shows the orange and not the blue. I know what you are thinking maybe they are not there. Well I go back ovAttachment 179963er the same spot with my 597 with it split screen on the 455khz and the 200khz and it shows both orange and blue fish ID

