Feedback on voice navigation: decent, but could use some work. Points noted on a test drive:
- as mentioned by klingerware, approaching an intersection I was given an instruction to "turn left in 1000 miles"
- one instruction was "in 2.5 miles, turn right." No other voice prompt was given when I actually reached the intersection.
- My destination was on a road parallel to the main road. As I drove past, it skipped the final turns and jumped straight to "you have arrived at your destination."

Additionally, I note that you are using maneuver nodes to determine when a turn is reached. I originally used this in Saera, however by itself it can lead to missed instructions if the gps cuts out as you pass a node. I switched to nodes + checking which segment is the closest, so that new directions can be given as soon as possible when you make a turn.