In the planning stages for a trip through South America. Current plan for navigation is mostly iPhone based solutions as that seems like what the locals use.  I'd like to supplement that with a dedicated device with a robust map set but everything seems pre-downloaded with US only and international coverage involves downloading OpenStreetMap files. I'm not sure I want to buy a device that is basically maps.me with a larger screen.  Looking for suggestions or experience. 
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iOverlander
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