Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
We Take iOS 6 & Turn By Turn Directions On The Road
Just hours after the developers beta for iOS 6 was available to us we could not wait to test out all of the new features and put them through the pace’s. As we travel around a lot we could not wait to put turn by turn directions which is included in the new maps application.
The data for this feature comes from the popular satellite navigation company TomTom.
Our experience with the turn by turn directions was short and sweet but I am sure we will carry on to use it in the future. The app is extremely easy to set up type in your location and with one click you can be on your way.