I was recently in boondocks central Illinois where the smartphone was basically useless for navigation. A fair amount of the time it wouldn't load any maps at all let alone navigate from point A to point B. A gps is a necessity there. I find the same thing within 45 mins of my home, or in the NC/TN mtns or pretty much anywhere outside of a town here in central/western NC.
So my question is this: why not both? I use a very old Garmin nuvi 780 and it keeps going and going. I also mount my phone as it is more useful many times. For music I have an mp3 in my pocket; the battery lasts at least 10 hrs between charges. I do have some music on my nuvi so I can either plug my earbuds into the nuvi directly for tunes and turn instructions or use the nuvi's FM transmitter feature to my FM receiver mp3 for that too when I want to.
So my question is this: why not both? I use a very old Garmin nuvi 780 and it keeps going and going. I also mount my phone as it is more useful many times. For music I have an mp3 in my pocket; the battery lasts at least 10 hrs between charges. I do have some music on my nuvi so I can either plug my earbuds into the nuvi directly for tunes and turn instructions or use the nuvi's FM transmitter feature to my FM receiver mp3 for that too when I want to.