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Interesting thread but the blue line will be the exact distance
Given that its 26.2 miles varying from that blue line will always make the course longer
But did anyone else notice it was impossible to follow the blue line exact? A few times it disappeared completely and I couldn't understand it but then somewhere in the Docklands I was running on it and it disappeared under a white fence and rejoined a bit further on. Obviously there are areas where the course is changed slightly once the Elite go through.
The blue line isn't always the right distance, nor is it the shortest distance. Going round a corner, it's shortest to go as close to the curb as possible but the machine that marks the blue line pre-race can't get that close - it has to mark the line about a metre away or something.
I suppose it would depend on where the course marker measured and whether they used a machine with as much clearance as the blue line marker.
Just dipping in to see what kind of results thebig G's gave. I was using Runkeeper.com app on my iPhone and I am relieved I only did it for the memory and not for a serious training aid. It shows over 29 miles!
Forerunner 305 - 26.45 miles
Mine Garmin forerunner 205 showed 26.89
I have since loaded up in google earth and can see point round Canary Wharf and also around 22 miles it goes way out and also under the train station bridge about 23 miles?
Link here: http://connect.garmin.com/activity/171293856