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Distance not accurate on Forerunner 35

I have a new - just over a month old Forerunner 35. It was ok to start with, but in the last couple of weeks it has stopped tracking my runs properly, seriously under distancing them (yes i have double and treble checked that I'm not just kidding myself with how far I ran - these are runs that previously tracked ok and also I have run using a TomTom so I am confident of the actual distance). The strange thing is the map show accurately where I have run, it's just is well off on the distance. How can I fix this? If I can't it makes the watch pointless.

Thanks in advance

0 6998041 over 2 years ago

It's kind of the same for me, I did a 20 minute, 3 mile track workout Thursday and it said I only went one mile, and Wednesday it said I hit my first mile at a point in that run where I'm usually 1.6 or 1.7 miles

0 JoeD over 2 years ago in reply to 6998041

If It's an Indoor Track using GPS it will be (not accurate).

Try Using Indoor Run (FR35)