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Mar 2016
12:27pm, 15 Mar 2016
9,761 posts
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Bazoaxe
Thanks folks, think I found it
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Mar 2016
1:22pm, 15 Mar 2016
11,513 posts
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Dvorak
Hi Ulric, you might find this interesting http://coursemeasurement.org.uk/gps.htm. I agree with baz, one of the races least likely to be wrong. I wonder if a close look at a Garmin trace would justify the 9.9 miles? I suspect not.
As an example, I ran Dunfermline parkrun on Saturday and it came up 70m short. But I could see that on each of three laps, it had cut a couple of corners. At around 10m a time, that makes the difference. Not to say that course are never measured or set wrongly - if everyone was half a mile out i d certainly be asking questions, but for small discrepancies I'd assume the GPS to be out.
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Mar 2016
1:52pm, 15 Mar 2016
142 posts
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Ulric
Yes they claim on the site its been measured twice now and is officially 10 miles. Its just a bit annoying that it may not show up either on a GPS or uploaded afterwards. Ironically I sometimes come to Strathy to do the parkrun just to get an accurate GPS run, as my local (Victoria Park) always come up short. I think that's to do with tree cover at the start.
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Mar 2016
1:59pm, 15 Mar 2016
9,765 posts
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Bazoaxe
The Lasswade 10 always comes up short as well at about 9.9 as well....I have put that down to the ups and downs on route, especially the down into Roslin Glen which I assume the satellites must fine hard to compute...
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Mar 2016
2:10pm, 15 Mar 2016
11,515 posts
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Dvorak
Keeping running after the line would look a bit odd: I suggest you start 0.1 miles back ;-).
(Which will also be the day it reads 10.2 miles at the finish.)
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Mar 2016
2:21pm, 15 Mar 2016
11,516 posts
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Dvorak
On the flipside, GPS can be useful regarding courses eg with the HM farrago at Edinburgh a couple of years ago:
Nearly everyone: "course was well short"
Organisers: "You can't rely on gps in a race"
Nearly everyone: "our gpses show you put the turnaround in the WRONG FUCKING PLACE!"
Organisers "nyah nyah nyah nyah can't hear you, we're not listening"
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Mar 2016
2:25pm, 15 Mar 2016
143 posts
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Ulric
Yes but running on past the line will impress people more 
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Mar 2016
3:06pm, 15 Mar 2016
9,766 posts
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Bazoaxe
3 months later
Organisers: we re-measured and the cone was in the right place as per measurement but the original course measurer was wrong and you ran 398.675 metres too far. PS, how about entering our super fast and flat and accurately measured half marathon for next year.....
Me: like what you promised me and would have been a 90s PB and ended up only being my 2nd fastest HM ever
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Mar 2016
3:48pm, 15 Mar 2016
8,128 posts
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Son of a Pronator Man
I had Tom Scott as 9.87 miles last year but any race with corners ( and there's a few of them) will measure short on GPS as the watch will cut the corners off. Check the trace and you'll see this.
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Mar 2016
4:01pm, 15 Mar 2016
144 posts
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Ulric
Thanks for the measurement data SOPM. But also if your device only uses smart recording the trace it stores produces a run shorter than the distance the device records as you go along which always uses the 1s data points. That's why my uploaded sessions always read short.
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