Really want to do this, but maps?

Hey all, I’m just about ready to pull the trigger on this. However for work I need to drive so many places, and need gps of some description (I work in trade services). My car has apple car play/android equivalent but no inbuilt gps. What could I do here?

Is there a dumb phone with good map options that can plug into car play, or a separate gps type thing?