We have a Tom Tom as well, and its very accurate, but it sits in the drawer now because it has to be upgraded on a regular basis to remain accurate.
If your out on the boonies without cell reception, you need a GPS.
I have the lowest priced, lowest tech hand held units by etrex that can be bought at Walmart.
I keep it as backup when elk hunting in NM as there is no cell service.
I walk up a ranch road on one side and walk out on the other side. It's accurate enough to show that much detail.
Modern phones nearly all have a GPS chip so you don't need cell signal for the GPS to work. But you will need an app with maps loaded and not use an app that streams data in order know on what to overlay your GPS-determined location.
It has a legit GPS inside. I used the CoPilot app for offline gps (i.e., no cell service), and it worked well.I have an iPhone 5S currently, and it has location services like most do, but don't they rely on cell tower pings for location? My iPhone 4 across the panhandle of OK, and in the mountains west would give me a notification that location services were not available and travel info would come from memory. Google maps.
My Tom Tom and Garmin hand held continue to update real time unless satellites are blocked by mountains.
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