George, I have used my phone or a Garmin GPS a few times to drive in Europe. Although I find them extremely helpful, I always study the driving route ahead of time for any sort of significant drive. E.g. I'll look at the map on Google Maps on my laptop. OK, I see it should take about two hours. Then if I type in an address on my phone and it says four hours...I know something is up, e.g. mistyped a postal code or something. I use the GPS to tell me exactly how to get from point A to point B, without remembering every turn, but I already have a general idea which direction I am going, what kind of drive it will be (freeway? back roads?), and about how long it will take - but I use the GPS to save me some of the time-consuming hassle of figuring out the exact directs. Using common sense in my driving has helped a lot, without 100% relying on technology!