This is a symptom of a wider problem, though: people believe their satnav without even thinking about whether there might be a mistake. At least with a map you have to interpret it yourself and so if things are going weird you will notice.
There's a nice sign at the A46 interchange with the Gunthorpe road (A6197 I think), where the junction has been recently greatly remodelled because they're upgrading the A46. It says something like 'NEW ROAD LAYOUT: Do not rely on satnav'. I think it's bad that people need that reminder.