I have the Navionics premium South card for mine. One foot contours on Toledo Bend, boat lanes marked, submerged structures, etc. Looks like this:
Navionics Webapp
My Elite-5 DSI wouldn't accept the platinum card which has google earth type topography. You're going to like that new unit. To tune my DSI in, I dropped a shiner below the transducer and fine tuned it until I could see the shiner. The blue background worked best for me.