Not running as far as I thought I was

For my running activities, I use my Suunto T3 with the optional Foot Pod – this allows me to track my speed and distance as I run. I find it quite useful: if a section of a run feels particulary difficult I can check my speed and see that perhaps I’m pushing harder than usual, as an example. The thing I don’t like about it is the calbration: to ensure its accuracy you have to calbriate it, meaning running at distance you know to be true (1 mile, for example) and then stop the Suunto and check

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Not running as far as I thought I was