Hey Jimbo, for what it's worth, I bought the navionics plus last early summer and used it through November. I was very pleased. I have it loaded into my lowrance hds7. I've ran the lake since 1982 and have used many different options of electronics from the earliest Loran c's to the first GPS, chart plotters, and must say that today's electronics are far beyond from yesteryear. Whichever chip you choose for your unit ,I feel your be very pleased. I, myself am very pleased with the navionics plus. Hope this helped a little.