Re: I use a map.
Piloting still needs a list of waypoints for the entire journey, and needs a map that covers everything.
With a suitably formatted address, one could navigate the UK road network based on purely that alone. OK, finding your source of authority once you've reached locale of small suburb of town on the outskirts of city in the county/region means that you DO have to stop and ask someone for directions... and therein of course lies the problem. Who likes asking for directions?