PA85,
Check under the Sonar menu tab for one called Digital Depth Source and set it to the “2D Element” setting. If the menu is not there, make sure that you are using the “Advanced” setting for the User Mode menu (found under the Setup menu tab). If it is still not there, check to see what software version you have in your 596c HD DI model unit. It needs to be 6.250 or higher to have this menu so if you are below that you need to register and update the software in your 596c HD DI unit.