I was in Paris earlier this month and took a mercedes taxi to center of city from airport. He had a terrific nav system with flat screen that emerged from his dash. Looked to be factory equipment. He keyed in the address to the hotel (small and almost impossible to find) and Vola, directions are given.
As we got closer, his system started saying "turn right in one block", etc., until we drove right up to the door.
Simply amazing. And this is a taxi! The ride cost me about $50.