Typically in fog; again, wrong

In the cold it is a demanding tour, although "only" 630 real vertical meters. Your GPS device is probably not that great, or is it a smartphone recording?

Yes, unfortunately only smartphone. In good weather it doesn't cause me any problems. But as soon as there is fog or rain, then she's crazy. Km and speed fits so far. Well, it's Christmas, maybe I'll get something for free 😁