There is another aspect which has not been mentioned. If a route is planned using a map, then there is a sense of where one is going to go, which towns and cities are going to be passed, what the geography will be like, etc. But when I recently drove to Southern Germany using the SatNav built in to a hire car, following the device's directions gave no sense of where we were. I know we passed Frankfurt, but I didn't know when. And at the end of the journey, the SatNav said we were at our destination when we were about 10 kms short. Luckily, we had a paper map with us, and found the correct route onwards. I don't know whose software the SatNav used, but the car was a new Vausxhall.
- Davey.