  What if an app could guide you to better health, similar to how GPS
navigation directs you to your desired destination? What if the app could use
real-time information to redirect you around a disease, just as you're rerouted
to avoid traffic? What if the app could provide step-by-step directions to get
you to your optimal health state, whether you're a professional athlete or
retires school teacher? We discuss how this navigational approach to healthcare
could become a reality by combining technology with well-established
cybernetics principles.
