I have just added a HELIX 9 CHIRP GPS G2N on my bow beside my HELIX 10 CHIRP SI GPS G2N. We Spider Rig for crappies and my fishing pardner and I both sit at the bow. He will be using the 9 with the fishing charts and recorded tracks but would also like to split the display and use 2D sounder screen. While at it he might as well do the AutoChart Live. I will just be using the 10 for DI and SI using the TM mount. The 9 is using the transom mount mounted on a retractable mount I made at the bow. I don't think there is a way for me to shut down just my 2D unless I am missing something. How can I make this work? Don