Attached is a shot from my Humminbird of fresh water bream in a river in Germany, at 3m depth over sand bottom.
Are such images also possible with the Garmin units (without the new UHD) or not? Most images from Garmin I've seen so far are horridly grainy and lack midtone definition and fish shadows. Is this a general problem? Are there transducers or units that work better? I've seen one image on Facebook from a GT40, which looked pretty good, but everything else shows hints of structure at best and bridge pylons / sidelobe artifacts at worst.