I recently bought a new dive computer, a Shearwater Tern TX. I did not see the computer listed in the app on my phone and could not sync my dives. I googled if it was supported and found that it was. What I found out is that the Google Play version of the app is no longer updated in the app store. It is recommended that you download the app directly from SubSurface and side load it. I figured I'd share in case someone else ran into the same problem.
