Old GPS or iPhone maps or google maps app?

I'm going to drive from IL down to SC and I don't trust my old garmin nuvï 255 nor iphone maps lol:-) GPS update is $50 which I'm not going to spend. So has anyone used iphone maps or google maps app on long distance trips? Or I just better use old gps?

Google maps is good but it used to need an internet connection. I think now you can preload tiles so you can use it outside cell converage.
If your phone doens't have a GPS chip the location may be inaccurate outside cities.

Use your old GPS, but only for general indication where you are. Use with paper maps, or at least study Google maps where you are going and plan your route.

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