Google Maps app for Android updated to 5.9.0, the “Transit Navigation” function has continue to be improved, Google Maps 5.9.0 also added a new Labs feature. You will find out that in the new version:
Humanity improvement, the ringtone and voice notification for the Transit Navigation. (test)
Good for the Tablet users, now Transit Navigation feature support the Android Tablet PC. (test)
You get an “Bubble button” if you enabled this new lab feature, then you can see new call and navigation buttons in the results on the map search result.