but the mention of satellite nav devices reminds me of an amusing incident.
I was visiting a client in one of the highly-fashionable Central London residential areas, and had just parked the car when a black Mercedes pulled up alongside. Gleaming all over, and looking every inch the all singing, all dancing 'look at me' car, there was a state of the art sat-nav screen glowing gently in the centre console. "excuse me" said the driver "can you tell me where XXXXX street is. "You're in it" I replied. "Oh, great", said the driver, "Thank God for that" and drove off.
It amused me, anyway.