In the past we used a TomTom 'GO 700' with full mapping. No problems, other than it did not allow us to navigate to GPS positions, other than ones we had saved. Later we used the system built in to our Audi and that was excellent. Now using the Freelander Satnav and that is also excellent. However, same as at home, these things are moronic and are only aide to navigation and will not replace common sense.