If you're measuring heights, and one guy guesses he's five foot five, and you're all the same height... does that mean you really are all five foot five? (I've met guys shorter than me who claim to be five foot six... amusingly). You can't assume that because all the speedometers agree, they're correct. It can also mean they're off by the same amount. Again, almost all cars have speedometers that are exactly 5% fast.
Like jut says, only way to know for sure is to use a GPS-based measuring device, like a smartphone.






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