My experience FWIW: I like to gravel ride in remote national forest areas. Needed ability to plan my route and then navigate it. I used to do this on various phone apps that don't need cell signal, only GPS - they worked just fine, but after my phone fell out of its mount a few times I decided I did not want to keep using my expensive iPhone for this purpose. So I got a Garmin Edge. All I wanted it to do was navigate and the Edge was the most highly recommended device for that purpose at the time I did my research. I went with the Edge 530 because I did not see a need for a touchscreen and reviews said everything else was equivalent minus touchscreen. Bottom line: The Edge mostly works just fine, but the GPS reception of the Edge is not nearly as good at the iPhone. There are many places in the area I typically ride where the Edge loses GPS signal (and then gets lost on its navigation), but if I pull out my phone it has plenty of GPS signal and knows exactly where it is. I still regularly use the Edge but find it odd that the dedicated navigation device does not have at least comparable GPS reception as my phone...