Garbage in garbage out....It's the map, stupid !
@Elsie, you obviously think the road starts at your door and finishes at the supermarket. Some people have broader horizons.
Satnav or no satnav, if the map you are using is wrong, then you are not going to find the place you are trying to reach. According to their own figures, the ambulances were mostly getting lost for reasons other than satnavs. An outdated A2Z is going to get you lost all the same. Just that it takes more of your attention off the road.
I am a regular user of satnav (very basic model) and it's a great security add-on, such an improvement from the times of having to stop to read a map, or worse trying to read it whilst driving. Sometimes the route is not the best, but the destination has always been correct.
Anyway, emergency services should maybe think of not relying on run of the mill town maps used by the general public. Several brands allow errors to be corrected by users feedback.