Dad bought a boat the other day that has an HDS7 Gen1 at the console, linked to a HDS5 Gen1 up front, and it has the Structurescan module. When I first tried to use the structurescan, it said No Source on a blank screen, Sonar and GPS work fine. I disconnected and reconnected the cable and the no source went away. But, I am not seeing any return. I have the white line in the middle of the screen, but no bottom data is showing up. Any thoughts? Thanks in advance.