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I recently started using TomTom amigo for car navigation in preference to Google maps and I noticed it uses openstreetmap data. Data seems good.

Try using organic maps. Free software with OSM data

TomTom uses their own data though (they're a major provider of car navs and navigation devices).

They are using OSM augmented with their own data. TomTom employs some mappers to fix issues they run into.