> In my experience, GPS is great for city driving with clear path to the sky (and >50% battery for any trip that is over an hour). Not so good in mountainous or remote locations.

I use my phone's GPS in the wilderness all the time and it's an amazing help. Having a topo map where you can see exactly where you are is awesome. Even just having altitude is a big help like the other day when I was trudging up a steep forested ridge and wanted to know how many more hundreds of feet I had to go before the summit.

Of course you can live without GPS, but I just can't make any sense out of arguing that it isn't anything other than amazing. I'd give up a lot of stuff before I'd give up GPS.