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Below are 2 extracts from e-mails I received from my Course Measuring connections. There's an interesting report of a paper at the IEEE website which concludes that GPS measurements of distance are always long. The work was carried out by researchers at the University of Salzburg (UoS), Salzburg Forschungsgesellchaft (SFG), and the Delft University of Technology. http://spectrum.ieee.org...imates_distance_traveledThis comment on their results caught my eye: Now, that pedestrian-course error of 1.2 to 2 percent isn’t huge. But it is big enough that your GPS watch could tell you you’re crossing the finish line of a 42,195-meter marathon while the real terminus is more than 400 meters ahead. It’s also clear that the GPS units they are using are professional quality. Walking a 10 mtr square course with the standard of GPS that runners use would be a pointless exercise.
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If I want to run a certain pace using my GPS watch, I always program a pace that's 1% quicker than my target, based on my previous experience of the watch measuring long (my GPS watch measures 13.22 mile for a HM). Of course, if I was a half-decent runner I wouldn't need the GPS to maintain pace! :-P
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This all sounds familiar Phil . Following the sad demise of my nike GPS watch I " upgraded " to a Garmin Forerunner 225 but found it so inaccurate that I would regard it as no better than a toy ( in my humble opinion ) . At last week's Barry Island parkrun the watch was cheerfully congratulating me on another 5K PB when I was still 180 metres out from the finish !!
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I've had two Garmins now and both have generally measured short. The last two parkruns have been 4.95 (Cardiff) and 4.91 (Penallta)!
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Thanks for posting this Phil. Most interesting! I do note that the error on my Garmin 910xt is poor at short distances (fraction of a mile), but appears to improve with increasing distance. Which is what you might expect as random errors should cancel out. However, measured against the Handicap/Castles 10M course gives 10.01M which is pretty good. It does depend on what path you run on the course, going round a bend, near to the curb or around another runner. Edited by user 07 November 2015 20:19:36(UTC)
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Smoke me a kipper, I'll be back for breakfast!
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