Hello.
I want to tell you a story about the Garmin Edge 820. The other day I did a 100+ kilometer lap.
I made a route in GPX format and loaded it on the device.
We've reached the starting point.
I loaded the route to be ready for navigation and started.
At the first roundabout I made a mistake and went elsewhere, but 100 meters further on, the direction could be corrected, and I followed the route.
The device has displayed the message that it is recalculating.
I want to tell you that even after about 30 minutes or 15 kilometers, he had not finished recalculating. My luck was that I had left the city, and it was a straight line on a national road.
Later on the route I did not take after the Garmin Edge 820 navigation and I needed to return, where at another roundabout I made the wrong exit and the device started to recalculate and actually crashed. I asked a few people on the street and I reached my destination a few blocks away.
So when it comes to navigation with the Garmin Edge 820 it's a nightmare, you can't trust it, it's going to be extraordinarily difficult. A mess.
In my opinion.