The Navionics maps seems good to me. I find the Sonar Charts Live feature very useful to help me get better maps of specific areas. I also like the ability to mark stuff on my tablet at home using the Navionics App and transfer that stuff to the map card in the graph. You can look at the Navionics map on the Navionics website to compare their map to what you are currently using on specific lakes. Kinda of a free look at what you will be getting.