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Calibration problem. Distance read wrong

Former Member
Former Member
Hello,

I have ran a half marathon recently and my 620 forerunner got only 20.8 km. I have edited the distance on my dashboard but it still didn't class it as half marathon on my personal records. Does anyone know how to fix this? Has anybody got this problem before?

The correct distance should have been @21.12-21.13km. I have started my watch 20-30m before the start gate.

Thanks
Stefan