opusone
Imagineer Wanna Be
- Joined
- Sep 7, 2011
- Messages
- 1,829
My understanding is that they make it a little bit over the distance because being 1/10 of a mile over is better than someone checking the course and it being .05 under and DQ'ing any important records broken on the course. That's at least what I have been told.
You are correct, but it's pretty minor. In course measurement, there is a 1.001 safety factor that is applied to the measurement. So, for a marathon (i.e. 26.21875 miles), if the calibration/measurement is completely accurate, then you would actually run 26.24497 miles if you ran the shortest possible route, or approximately 0.026 miles too far. Clearly, 0.026 miles is very minor in context of a marathon, but it does help make sure that the course is record-eligible.