I have used OSMAND+ on and off for hiking.
It is OK and can use Garmin GPX files.
For driving it is OK for short trips.
If I were you I would spend some money on a Garmin Stand alone unit.
Now a days they come with everything you need.
Life Time Traffic
Life Time Speed Cams
Life Time Map updates.
All in one price with out the need of a data connection.
The Traffic comes over a DAB+ receiver built in to the unit.
Pick one up when you get to the states.
Bring you GPX files with you and add them to the GPS
This is a good website to convert routes into GPX files.
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