The simplest way to rectify this, is to use mapping software to give you the distance of a course, or even better, use an established track/route that has been measured, and then run that and record the time (and compare what the strava recording says vs what you measured it to be).
The simplest way to rectify this, is to use mapping software to give you the distance of a course, or even better, use an established track/route that has been measured, and then run that and record the time (and compare what the strava recording says vs what you measured it to be).