I just bought a helix 7 for just those reasons. Wanted to upgrade both soft and hard water units. Bought the helix, ice transducer, mounted them to a "blue genz box" as seen on vexilars, now have vastly upgraded both units for half price. Nice thing with helix is you can have your lake maps right on the screen, get to your spot, switch to sonar and go! Plus have all your marked hot spots from summer!