Hello, I am in the process of upgrading electronics. My aging NavNet Furuno is adequate as far as the plotter goes, but not great. It seems to take on a mind of its own and at times will jump between settings unprovoked. The most frustrating is the autonomous propensity to "go to curser" so when I glance up at the chart I'm looking at a Myakka FL or some such. Not helpful. However, most important is that it is a mediocre bottom machine. The current dual frequency 250/50 ducer and sounder were probably great in the mid 1980s, but now, not so much. Time has exacted its toll. But I am not going to physically remove this unit yet, it does work in the broad sense of the word. After researching this, and in light of the fact that most of our fishing is grouper/snapper fishing in 7-30 fathoms (90% less than 18 fathoms) I decided to go with the Garmin 7610xsv with a pair of GT 50 thru hull ducers. The latter were seleted specifically for their outstanding shallow water resolution in downvu and sidevu. If I find I am less satisfied with their performance in the deeper end of common fishing depths I can add an Airmar B175 down the road. The question I have is if other Post owners have installed dual GT 50 (or GT 51) ducers? If so, where did you mount them. Through the hull near the forward engine room? I know that the boat will have to be blocked, these ducers don't lend themselves for a quick install in the slings because they have to be faired and its a big deal. They also need 24 hrs to cure according to a Garmin installer I spoke with. He also talked about "having to pull down the headliner" and such to route the ducer cables. Really? I also have an ancient Simrad color machine (CRT). This dinosour does not function, but has a ducer and cables. Why can't I fish my new ducer cable behind the Simrad ducer cable? Any one tried this? Thanks!