I'm more or less ignoring the whole thread in order to say that I reckon if you're in the market for a new sounder/chartplotter it's probably worth finding some way to have a go with whatever you're looking at buying first. The Furuno 1871 I have is good for picking up fish but the user interface is terrible and the chartplotter side is horrible. It may be a side effect of a lifetime of using Garmin GPS units but I don't like it, it's very non-intuitive and the instruction manual isn't very helpful as it doesn't explain what any of the non-intuitively named settings actually do. I can see schools of fish in ~200m of water with a P66 though so that's good
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