GPS accuracy - track and field

Mff73

@thomas-ma
It doesn’t really look like non accuracy, as it is really “geometrical”
Have you eventually transfered the same workout to another plateform to compare the representation ?
SA activity link or fit file may help to see what is inside (wrong data, wrong representation, raw data behind for suuntoguys).

TM0702

Thanks all. So I followed the instruction above and switched to another GPS system to “Galileo.” Attached is the tracking map.

My next question is the accuracy: I ran 12.5 laps, which should end up equal to be 5k. However, the Suunto shows 5.38km. I ran on Lane 4 which is 423m per lap, and it should equal to 5.28m, I know 100m discrepancy is not huge but my friend is using another brand, Coros and his watch’s discrepancy is only 10m. We ran side by side as well.

DMytro

@thomas-ma i think coros has a special feature for lap running where it averages out gps descrepancies so you get nicer track + more reliable distance.

TM0702

@дима-мельниченко Agree. In general I am quite happy with my Suunto 9 tracking.

Does anyone know if there is any different GPS tracking function between “Track and Field” vs “Running” function? If no, should I just use “running” function for running at the sports ground going forward?

surfboomerang

@thomas-ma I noticed running profile does not record GPS every second, but a random interval between 1-4 seconds. On road races with distance of half a marathon I noticed the watch is always spot on in distance, but on a 400m track I can imagine it cuts the corners less accurate then it should do.

Maybe that explains the difference.

isazi

This is from this morning in Amsterdam. Standard running profile, GPS+Beidou.

Dimitrios Kanellopoulos

@isazi I know the place well

DMytro

@isazi image isn’t from SA, right?

isazi

@дима-мельниченко Runalyze with ESRI satellites view.

TM0702

@isazi said in GPS accuracy - track and field:

Interesting. Next time I will try the GPBeidou system and see if it reports better result.

And you can tell from the screenshot (from Strava) my GPS is completely off track.

zadow

@thomas-ma
Hi, have you tried “Track and Field” Sport mode for running on track? I can remember that I read somewhere that it (should) has some special setting for tracking running on Track. I have never tried it by myself. It just rang the bell for me, when I read your post…

Dimitrios Kanellopoulos

@thomas-ma keep in mind that the satelite overlay isnt always 1:1.

TM0702

Thanks. i understand it is not always 1:1.

May be next time I will try the normal “running” mode while running on track and see if there is any difference.

TM0702

So I run another 10k using the regular run function, and here is the map from Strava. 10k should be 25 laps, but I think I ran 24 laps + 250m(?) from the map.

zhang965

my 10k, it’s quite accuracy

Bulkan

@zhang965 Did you use loop? just curious if work well in a track.

Shrek3k

@thomas-ma 24 laps + 250m would be rather outstanding and excellent in terms of accuracy.
Just check how and where the 400m lap really is 400m long … I think it is nearly impossible to run the ‘perfect line’ for so long.

zhang965

@bulkan said in GPS accuracy - track and field:

@zhang965 Did you use loop? just curious if work well in a track.

auto lap 1k

isazi

@bulkan I used the loop S+ on the track, worked pretty well.

TM0702

@shrek3k Actually I checked again as I only ran 23, not 24 loop!!!

I stayed at lane 2 most of the time so it should be 407.67m per loop. In theory it is 407.67 x 23 = 9,307.41+ 250 = 9,626.41. That’s off by 373.59m or 3.7%.