Don't need a GPS to screw up, my wife once drove to Nottingham (about 90 miles away) for an exam, was running a bit late, parked her car, paid for a ticket and ran to the exam centre.
An hour or so later she returned to the car park but couldn't find her car, frantic searching provided no results so she phoned the car park operators (NCP) to advise/help her.
A man from the company drove to her location and asked to see her ticket to ascertain what floor/area of the car park she'd parked in.
'But this isn't a ticket for an NCP car park!'
He kindly drove her to the correct car park where they found the car at once.
Another time she'd parked at Sainsbury's supermarket, bought some stuff and went out to the car, but couldn't unlock the car!!! She phoned the RAC to come and get her sorted but while she was waiting she spotted the car in the next row!
I swear, she is an intelligent woman, currently studying for her Masters, but like I say - there is a balance between education and common sense, not many people are blessed with both.