Spooky - my Cali knows where it is?

[chris151151]

Any experts on here who can answer this? Driving in UK, ACC slows when trying to undertake on motorway. Going to France, started off on autoroute, ACC braked when overtaking on lhs, had to accelerate to override. After 7/8 km, it decided this was OK and for next two weeks operated in French mode. Came back on Eurotunnel, first few miles on M20 ACC slowed when overtaking on rhs, then decided overtaking on right was OK for rest of trip and carried on in English mode. AI, GPS, or magic?