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vivoactive 4s not accurate on distance

Why my vivoactive 4s is not accurate on distance? 

I have ran a few races now, with two watches, the Vivoactive 4s and my TomTom... My TomTom has given close approximation to the distance for which race I ran (eg. Marathon, Half Marathon), but the Vivoactive 4s has been short, way too short I should say. How do I fix that?