Originally Posted by
John_V
RideWithGPS does an excellent job of giving you turn by turn instructions. You don't need cell service for TBT to work since the waypoints for your turns are inserted as part of the file when the route is created. You can create your own GPX route file if you have a printed map or que cards of the route by going on the RideWithGPS website after signing up. Once the route is created, you can download it into your RWGPS phone app and all the TBT info comes with it.
The ridewithgps app appears to work very well. It just costs $6/month to use it (you can use it month to month ).