Just the right amount of audio to be informative and interesting without every being annoying. Had some trouble with the rental car Bluetooth interface but finally figured out there was a conflict between the BT and plugging the phone into the stereo USB port which wants to control the phone. Resolved this by plugging the phone into the rear seat USB for power only and using only BT to have the audio play through the audio system. Cant blame the app for this but this tip might be useful to others. Anyway, great addition to our vacation and highly recommended.