Discussion
My GPS has logged between 4.87 and 5.09 km for my local course, you can get a lot of inaccuracies on a GPS trace, especially if you have some tight corners and lots of tree cover.
We had a bit of a last minute course redesign on Sunday morning due to another event at the park. First finisher was 4 seconds slower than he managed last week so I think we got the distance right but I was slightly nervous about it to begin with.
We had a bit of a last minute course redesign on Sunday morning due to another event at the park. First finisher was 4 seconds slower than he managed last week so I think we got the distance right but I was slightly nervous about it to begin with.
Foliage said:
I did a park run the other week, not gonna say which one, but was a tad disappointed that it appeared to be 200 meters short... Ive noticed this happen before.
After some encouragment from my daughter, she has been doing it for years and even does Blind Leading, I did my 1st Parkrun last Saturday at Bois de Boulogne, Paris.Bit strange as out of the 60 runners there did not appear to be many French.
I noticed that my GPS on my phone was 200m short of 5k. Very happy with 26:28 and it was a nice good feeling to run with others.
need to to keep to the centre of the track next time to see if it makes the 200M diference.
Phone GPS can be notoriously bad at accuracy for the following reasons:
- Aggressive power saving profiles
- Lack of in-built error correction measures
- Use of WiFi and cellular towers for geo-location assistance
Phones are designed to save power where possible, unlike GPS watches that are designed with a single task in mind with accuracy as a priority. A GPS watch will continue to draw full power until the run is done or the battery dies.
Many GPS watches will have some form of error correction in place to try and smooth out any quirks, either in software or hardware, or a combination of the two. Some Garmins will utilise the accelerometer that measures your cadence and stride length to help itself out when it encounters a weak or no signal. Phones tend not to do this.
Phones will leverage WiFi networks and cellular towers to try and speed up initial connection and to maintain rough location when GPS cuts out or becomes weak. If ever you see a GPS trace from a phone that appears to be pulling from building to building, this is the WiFi network assist at play.
- Aggressive power saving profiles
- Lack of in-built error correction measures
- Use of WiFi and cellular towers for geo-location assistance
Phones are designed to save power where possible, unlike GPS watches that are designed with a single task in mind with accuracy as a priority. A GPS watch will continue to draw full power until the run is done or the battery dies.
Many GPS watches will have some form of error correction in place to try and smooth out any quirks, either in software or hardware, or a combination of the two. Some Garmins will utilise the accelerometer that measures your cadence and stride length to help itself out when it encounters a weak or no signal. Phones tend not to do this.
Phones will leverage WiFi networks and cellular towers to try and speed up initial connection and to maintain rough location when GPS cuts out or becomes weak. If ever you see a GPS trace from a phone that appears to be pulling from building to building, this is the WiFi network assist at play.
Edited by Cybertronian on Tuesday 6th August 11:28
GPS is often incorrect due to the following.
It is only accurate to 3 meters or so, and its refresh rate is normally once per second. so if you go around a corner it may measure 3 meters inside the corner or outside the corner and will 'jump' between the points it gets a signal. It cannot be 100% accurate.
It is only accurate to 3 meters or so, and its refresh rate is normally once per second. so if you go around a corner it may measure 3 meters inside the corner or outside the corner and will 'jump' between the points it gets a signal. It cannot be 100% accurate.
KTF said:
Foliage said:
I did a park run the other week, not gonna say which one, but was a tad disappointed that it appeared to be 200 meters short... Ive noticed this happen before.
Did you run round it with a measuring wheel then or just decide it was short by looking at your GPS?
Sad day at my local Parkrun today. I was up and just about to leave to go to a different Parkrun this morning and my mum text me asking if I was going to the local and would I pick her up. As she was unlikely to go if I didn't, I didn't mention my alternative plans and agreed to pick her up. She knows a fair few people at the parkrun as she worked at a local doctors and there is always someone who comes up to her for a chat. Today, it was Terry, a lovely man who at 79 years of age and with only 1 lung was a marvel really, having got his time down from 1 hour to just 40 minutes since the run started last year. As usual, I run off and my mum makes her way around (she only walks the course) and when I finish I retrace the course to meet her coming the other way. Today, as I was talking to a marshal on my retrace of the route an air ambulance started circulating. For a tense 10 minutes, I was panicked thinking the worse for my mum, until she appeared round the corner. Sadly, Terry, who as a local councillor was instrumental in ensuring there was a defibrillator at the run every week had had a heart attack and has sadly passed away. RIP Terry :-(
Good afternoon Parkrun Pistonheaders,
i'm after a bit of advice re my parkrun times. My local parkrun is Dunfermline, it has a notoriously difficult hill which is done 3 times. After completing my first lap I really struggled to get going again after 'the hill', the closest thing I can describe it as is a build up of lactic acid, last experienced when I played lock for my local rugby team and found I couldn't run after a hard scrum. I plodded round on my second lap and again really struggled on 'the hill', by the 3rd lap I ended up walking up the hill which killed my time and did nothing to make me feel better.
the symptoms I can only describe as heavy legs, with a heavy sluggish feeling round my core muscles, top of my legs, tummy and buttocks.
Is this likely to be lactic acid? how can i counter it?
for reference, my Dunfermline PB is 22.28, yesterday I did just over 25mins. 2 weeks ago at Perth(flat) I did 22.32, my overall PB is 22.04 at Kirkcaldy, though I was about a stone lighter then.
any advice greatfully recieved.
Many thanks,
Craig
i'm after a bit of advice re my parkrun times. My local parkrun is Dunfermline, it has a notoriously difficult hill which is done 3 times. After completing my first lap I really struggled to get going again after 'the hill', the closest thing I can describe it as is a build up of lactic acid, last experienced when I played lock for my local rugby team and found I couldn't run after a hard scrum. I plodded round on my second lap and again really struggled on 'the hill', by the 3rd lap I ended up walking up the hill which killed my time and did nothing to make me feel better.
the symptoms I can only describe as heavy legs, with a heavy sluggish feeling round my core muscles, top of my legs, tummy and buttocks.
Is this likely to be lactic acid? how can i counter it?
for reference, my Dunfermline PB is 22.28, yesterday I did just over 25mins. 2 weeks ago at Perth(flat) I did 22.32, my overall PB is 22.04 at Kirkcaldy, though I was about a stone lighter then.
any advice greatfully recieved.
Many thanks,
Craig
What sort of training do you do Craig? Any tempo runs?
https://strengthrunning.com/2016/04/a-step-by-step...
https://www.runnersworld.com/advanced/a20827239/wh...
https://strengthrunning.com/2016/04/a-step-by-step...
https://www.runnersworld.com/advanced/a20827239/wh...
My first real parkrun tourism trip this weekend - I've done 50+ different events but they are either not too far from home or combined with being away for something else - weekend away to Portrush, NI with 3 of our team.
Out and back along the beach,,the most amazing course I've run, and the roads are good too - very quiet.
Not a PB course, I was about 2 mins slower than last week, but great to run along the beach.
Out and back along the beach,,the most amazing course I've run, and the roads are good too - very quiet.
Not a PB course, I was about 2 mins slower than last week, but great to run along the beach.
Both my local parkruns (500+ runners) had to put appeals out on Friday for more volunteers, but I was volunteer coordinator for Junior parkrun on Sunday and we were swamped. I had every post filled by Friday and 5 more people volunteered on Sunday! I think we're seeing the effect of parents taking holidays at different times to people without kids. 
I guess start of new term might mean people getting back in to a routine too, we've probably had 50% more kids than normal the last couple of weeks.
In other news, parkrun Netherlands! WooHoo!
I guess start of new term might mean people getting back in to a routine too, we've probably had 50% more kids than normal the last couple of weeks.
In other news, parkrun Netherlands! WooHoo!
Edited by RizzoTheRat on Monday 16th September 08:03
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