Ok so my boat came with two HDS gen 3 units a 9 inch and a 7 inch not hooked up together, I have been running the 7 as a gps and the nine as a sounder . Now the 2D works fine but I can’t get the 9 inch or 7 for that matter to do the down and side imaging thing that I see on you tube , my down and side imaging seems weak and not detailed for some reason it all seems to hard and too many adjustments. Can someone help or should I sell both and buy something more modern like the Garmin or hummingbird, I never had too touch my old Furuno ever except to zoom in , in 14 years it never caused me an issue . Is there any that have side and down scan that are fit and turn on and it works or am I kidding myself, I fish creeks and rivers and very occasionally offshore to 50 mt so what would you recommend in the new range of sounders and gps . I want 10 or 9 inch max and only one unit thanks . Matt