I half agree with you here. I don't have a stand alone satnav and use my phone + google maps. However, it has let me down on a few occasions when I needed it most.
- First two times were at night in the middle of nowhere. Google + phone had got me part way home, but then lost internet signal so the maps would not update.
- Last time was the battery on the phone going. I hadn't packed a charger and ran out of power.
Both the above could have been prevented with some foresight like a paper map or a charger or downloading the maps from google, but it does point out some of the shortcomings of using a phone as a Satnav.
A stand alone thing does not require the internet as the maps are on the device, and the batteries last longer / is always plugged in.
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