I have had Navionics on my Humminbird 598 and like it well. Just purchased Lakemaster for my Helix 7 DI GPS. Was very disappointed to discover that the options for the Helix 7 was much different (generic) than for the Solix or Onix models. The color options were very limited. Called Hummminbird reps. Even though they were courteous they did not appear to have any real world experience with the software. Trying to get an apples to apples comparison is very difficult. Going to try Navionics next.