The service typically uses electronic devices and key cards to make it possible for renters to unlock cars, which ideally should be within walking distance (actual car keys should already be inside the vehicles).

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Turning left is not a matter of indicating and waiting for a break in the traffic before making a 90 degree turn--it is more a 15 degree penetration technique from some distance before the actual turn, as the driver dares oncoming traffic into a head-on before sliding by their front fenders into the required side street.

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Tail winds might account for some of the off-target distance, NASA's Gavin Mendeck said, but the actual landing spot was well within the expected range of uncertainty, or the area where the rover could well have ended up.

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"The actual word shape was the most distinctive thing because if you had Birmingham in capitals, from a distance, it's difficult to read but in caps and lower case you have word shape, " says Calvert.

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