Actually on Saturday I turned the GPS on and pushed it into the mesh pocket of my rucksack, I didn't really need it I just wanted a GPS trace. Visibility was good and I knew the route. At the end of my walk I went to log my route but found the GPS's battery was flat and the set had switched itself off. Surprisingly when I charged it up it had actually continued to log the whole route.
If it had been bad visibility, I didn't know the route and only had the GPS I would have been stuck. You can buy a lot of maps for the price of a GPS. Map and compass don't need batteries charging they work when ever you need them. I do actually use both, and also have VR on the phone but I still think relying on VR/GPS alone is not wise.