Reading through this whole discussion thread it looks like the pattern is that Google Maps data is super sketch for anywhere that's not the continental US.
In September, I was in Hunza, northern Pakistan. The mountains are so tall, like 7k to 8k+ meters tall, I couldn’t even get a GPS lock most of the time. Even with a downloaded, offline map, it Google Maps was less than useless for navigation (still worked OK as a “paper” map).