For me, this doesn't solve anything. This is looking for something to fit tech in.
You can already do this with your phone, and it isn't like checking your phone whilst walking is going to kill you or someone else (unlike using your phone whilst driving).
You can also use the sign posts around you, my city has more than enough for people walking to get where the need, or at least the rough area.
You can also use headphones for the verbal call outs.
Another alternative would be a smart watch. Loads have maps or bread crumb style maps.
The real answers have been for more disability or accessibility not seeing Google maps constantly while walking.