Course accuracy: why your GPS watch isn't infallible

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https://www.theguardian.com/lifeandstyle/the-running-blog/2016/apr/15/course-accuracy-why-your-gps-watch-isnt-infallible

‘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.