What difference do you think there is between Sat Nav and GPS?
I think you are taking screen size. In terms of features relative to screen size... well that is so blurred as to be useless. You can get small screen GPSes that do all most all of the things the largest GPS/sat nav will do.
Most Garmin models will take OSM maps ... all the ones that take maps .. there are some simple (cheap) models that don't load maps. Same with other brands.
It would help if you said what kind of vehicle you were taking? And what other uses you would like to use it for? Walking, bicycle riding to 4WD navigation have different needs.
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