‘The course was long!’ ‘I ran an extra mile!’ – we’ve all heard it. But why do people always assume that their GPS watches are dead accurate?
There’s something that is guaranteed to come up on every finish line of every race. No, not vomit – but course accuracy. These days, lots of runners have GPS watches, and it’s easy to imagine that they offer infallible evidence that the course measurer should be made to give you a piggyback to the finish line.
Of course, certified courses are always long, by one metre per kilometre – basically, to make sure that they are definitely not short. A car speedometer is the same – it errs on the side of caution so that it doesn’t inadvertently fool you into speeding.
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