I have the 7000c and the lcx111chd both have the 10.4 screen. I use the Navtronic chart chip that looks just like the paper charts. I'm very happy with the way they both work, the hd , I've never used it. Haveing two gps chart plotters is just for back up. Out in the fog the gps sometimes stops working, so radar takes over then. The 10.4 color screen is great size. the 7600c hd for that price that boatfix is sell it is great, I paid over 2000. years back when I got the 7000c. Doest the 7600c do sounding?