I have the T-box also and have the app on several mobile devices--Android and iOS.
Do you do the Navionics Sonar Charts Live with it also? I do.
The iPad in this picture has the original Sonarphone app that was changed to match the Android version:
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1