The Helix's are really accurate. I like to use the zoom mode and you can really see the jig and fish movement in deeper water. The IR or interference rejection settings will let you fish next to anything with a jumbled up screen, though you may to change your sensitivity settings, or gain. I haven't ever used the flasher mode since i'm used to the graph. I also have a navionics card in it, which stores my waypoints and builds a map of lakes i have fished that aren't on the map chart.
