The topic seems quite neatly covered here:
https://www.theaa.com/european-breakdown...tor-france
i.e. according to Google, the feature will switch off when you cross the channel. Hugh is right about the charges though.
I am not a huge fan of Satnav, but on long overseas journeys especially if travelling through or around French towns on minor roads (which can get a bit vague) it does make life a bit easier. I favour paper maps less ardently now that I have to find and put on spectacles to read them! - but always carry one. Last year I installed (on Robert Leigh's advice) a TomTom "Go" Basic (5") in the Ulster, the price tag was about £125. All I had to do was wire up a cheap cigarette lighter socket to the nearest power supply (I ran a wire from my SU petrol pump) and improvise a mount for it on top of the steering column. It runs fine on the standard A7 6V. It is possible to plan your preferred small-roads route at home (on Google Maps, which is way better than the Tomtom software) and upload it to the device, rather than relying on the route(s) it suggests. If you'd like to know more drop me a message and I'll share a "how-to". Note that these comments are specific to the model of Satnav, I have spoken to others who have reported less success.
https://www.theaa.com/european-breakdown...tor-france
i.e. according to Google, the feature will switch off when you cross the channel. Hugh is right about the charges though.
I am not a huge fan of Satnav, but on long overseas journeys especially if travelling through or around French towns on minor roads (which can get a bit vague) it does make life a bit easier. I favour paper maps less ardently now that I have to find and put on spectacles to read them! - but always carry one. Last year I installed (on Robert Leigh's advice) a TomTom "Go" Basic (5") in the Ulster, the price tag was about £125. All I had to do was wire up a cheap cigarette lighter socket to the nearest power supply (I ran a wire from my SU petrol pump) and improvise a mount for it on top of the steering column. It runs fine on the standard A7 6V. It is possible to plan your preferred small-roads route at home (on Google Maps, which is way better than the Tomtom software) and upload it to the device, rather than relying on the route(s) it suggests. If you'd like to know more drop me a message and I'll share a "how-to". Note that these comments are specific to the model of Satnav, I have spoken to others who have reported less success.