I only switched from HB to Lowrance because my buddy had one and it was dialed in like the pretty screen shots you see posted on here here. I have a 3.5" Humminbird with GPS that I bought back when this technology first came out. Back then it costs a much as a 7" today. I've held on to it mainly because it's not worth anything today but guess what? It still works perfectly. It takes a chip card and if you can read it, 3.5" remember, it is dead on and crystal clear. I had a HB Helix on my last boat but I let it go and went with the Lowrance. Oh well, live and learn, die and forget it all.