Today my on-board nav failed in a classic way:
Instead of showing the "distance to destination" it displayed the distance from the origin - as negative value.
For good measure, it's screen went black from time to time:
Software is never quite perfect, that's OK, but having a negative distance is pretty remarkable. ;-) On the other hand: It did not crash and it also came to the conclusion that it 'does not not' the ETA
(which would be negative: I arrived 20 minutes before I took this picture being -35km away. Ehm, I am not quite sure whether my English grammar skills allows me to phrase this correctly. Sounds like Douglas Adams to me)