Distance Measurement Accuracy

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Kevin Frick:
Let me add to the ponderings here.  I am perfectly happy to accept the race distance in a certified course.  How about a local 5K.  I realize the Garmin may not be 100% accurate.  But what if I map out the course on Google Maps or Map Quest and it is different from the advertised couse distance.  I'm just trying to understand how my running is doing and the difference between my "Garmin time" and the true time (or alternatively between the MapQuest/GoogleMaps distance and the advertised distance) is big enough to make me wonder about how I did.

Benn Griffin:
Online mapping has never been accurate for me, because it is simply impossible to mimik all of the tangents and turns precisely. I have found that frequently the measurements for a 5.5 mile around the block loop at my parents house is off by .1 or .2

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