I have the Mobile App on Android smartphones, an iPad and a couple of Android tablets.
I also use Navionics map cards in four Humminbird units.
I use the App for Sonar Charts Live and for reference when discussing fishing locations and map details when I don't have my units handy.
It is a mobile device battery killer if you expect to use it for much navigation. Works great though.
Humminbird Helix 12 SI, 1198c SI, 1198c SI, ONIX 10 SI NT, 360, RC-1