Thanks for everyones comments. VIC, I fully understood the HDS 7 's capabilities with structure scan. My boat is a Tracker stick steer that had HST-WSBL transducers at each ends e/w a switch to go from front to back. This configuration would show 83 htz on half of the screen and 200 htz on the other. The 83 gave a little more bottom view. I considered the structure scan module which would have required mouting another transducer Structurer scan was approx. $600, to mount on trolling motor would require a protector shield at about$180, to mount on the transom would mean pulling in new transducer cable and going through the possible outboard motor intervention. Then there was the problem , where to mount the LSS unit. The HDS is a great unit and I liked it, worked great, and I hope Navyangler is putting it to good use. With the Elite 7 HDI, all I had to do was change out the TM transducer, add the Lowrance protector shield at $20 and power it up. Believe me I did a lot of research and I am enjoying the DI.I can split the 2D and DI over and under or side by side, with or with out GPS Like I said in my original posting, Make your decisions the best you can according to your likes and needs. Who knows I might have made a bad call, won't be the first time.... Thanks again for everyones comments