You know, the doctor is going to not only know about the state of the science about these things, but they also know the patient's medical history and are, I think, a veryimportantcomponent here of helping to give clear, simple messages about what people can do about it.
It utilizes a phone's digital compass, and read out the direction the user is facing, something that is apparently veryimportant when navigating through public transport, while the audio component opens up Google Map features in a non-visual way.