? re: moving time on Garmin vs. MB -- which is correct? (Read 1027 times)

I've used my Garmin in a HM and Marathon now, and for both races I found it measured the courses as apx. 0.2-0.3 miles longer than the race is. Since we're on the topic of Garmin accuracy, has anyone else experienced this? I know not taking proper tangents around corners adds distance... but 0.2-0.3 miles worth of distance?

This is a common result. Being 0.3 miles long is only 1.1% off for a marathon, so that's not much. And over the course of a long race, not taking the tangents and corners properly really can add up, especially on a course with a lot of curves.

0.3 miles long is only 1.1% off for a marathon, so that's not much.

Ah statistics. Gotta love them. Thats a very good point you raise when you think of it in those terms. A 1.1% error is not that much (be it the runner or the device) Hills, crowd weaving, and inefficient tangents make for extra distance/computing errors. I guess I'll stop sending hate mail to race directors now (kidding) A good thing to be aware of too, especially when going for a time goal... don't be too confident in the readings of one's Garmin. It is nothing but a (close) approximation of what you have actually done.