What a wonderful asset it must be to have a photographic memory. Having memorized a route what happens if you are unable to follow it? Roads get closed by road works or accidents, and sometimes you miss a turn simply by getting stuck in the wrong lane. The GPS calculates an alternative very quickly. Sure some people don't like technology (apparently that dislike doesn't extend to car ownership) but I hope that I don't meet one who has his head down reading the map instead of looking through the windscreen.