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:

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Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1