[dude]

"Measured it with Garmin 310x. I had the alert spltting out my Km splits. For the first couple of Ks they were within a few metres of the markers on the course. Then suddenly a 250m differential appeared which stayed there throughout the rest of the run until the end when 400m disappeared from somewhere. Of course in the last 2Km I wasn't really paying attention to the markers. So its really the manner in which the course markers and the Garmin got out of whack. If there was a consistent 15metres drift over each Km, then maybe you could say that the GPS was not calibrated properly, but when the distance just disappears in 'chunks' then I am more inclinded to believe the Garmin and say that the course distance is fudged. Not only that, but if you look at eveyone's pace during the last few Kms (where there are a few timing mats) it really gives the game away. Anyway my Garmin said 41.58Km.

I really don't get why they 'short' the courses like that. There's enough turn arounds on the run for them to nail the distance. With half the field wearing GPS units it's not like no one knows anymore. If I were Chrissie, I'd rather be sitting on an honest 8h25 world best rather than a 8h18* world best (*course distance not certified). "

http://forum.slowtwitch.com/gforum.c...913848#2913848