What are the rules for using satnavs in France? Mike Wittekind, Dartford, Kent, writes From November this year, I understand it will be an offence to drive a car in France which has a satnav that can indicate the presence of speed cameras and whether or not the device is switched on. As most modern cars now have a built-in satnav as standard, how will the drivers of such cars be affected? I cannot believe that French motorists will be affected by the legislation but I am absolutely convinced that British drivers will be considered fair game by the police. What action can we take to avoid running foul of this law? Nick Trend, consumer expert, replies I asked the French tourist office and embassy in London to respond to this. It said that in January 2012, a law was passed in France to forbid the ownership or use of all systems which indicate the presence of speed cameras. The fine if French drivers use or have these systems is €1,500, plus six points on your driving licence. Unfortunately, with regard to your question, it could only add that it is "difficult to know about the position regarding English drivers as there is no agreement between England and France on this subject." The embassy made the following points: If English drivers don't use a specific system which indicates the presence of speed cameras, policemen aren't allowed to inspect a GPS or a mobile phone to verify the existence of such a system without cause. In France, GPS manufacturers offer the possibility of downloading an update from their websites to deactivate the speed-camera tracking system and there is probably the same system in England. This seems to me to be a very unsatisfactory state of affairs, and I'd be interested to hear from any reader who is stopped or fined on these grounds. Email your query to asktheexperts@telegraph.co.uk or click on the image above to find out more. About Nick Trend Nick Trend trained at the Consumers" Association and has been an editor and writer for the Telegraph Travel section since 1995.