Race 2 accuracy

[Brad_Olwin]

80 km trail race here is distance from V2 and R2 well within GPS error. First V2 and second R2 with V2 right wrist and R2 left wrist. Last Saturday 18/04

Distance 85.76 Km 84.32 Km 1.44 Km (1.7%)

[jjpaz]

@Brad_Olwin said in Race 2 accuracy:

80 km trail race here is distance from V2 and R2 well within GPS error. First V2 and second R2 with V2 right wrist and R2 left wrist. Last Saturday 18/04

Distance 85.76 Km 84.32 Km 1.44 Km (1.7%)

There you have the ~1.5% difference in mountainous terrain, as I wrote in my tests thread.
The thing is that older models (Race, Vertical, Race S) will be closest to V2 distance than to R2 distance so clearly accuracy is different in Race 2.

[EzioAuditore]

@Brad_Olwin that difference is on the ‘bigger’ side. I had similar shortening with Fenix 6x and Galaxy 3 (I think) and these were no multi-band, multi-system watches.
Having ~750m difference on a marathon (race) is not small number I believe. That being said I think someone has shown here that the distance is good but the watch filters the gps points that leads to shorter track, so theoretically increasing the snr threshold should ‘fix’ this.
In any case R2 for training and V2 for the race day for me

[jjpaz]

@Brad_Olwin said in Race 2 accuracy:

80 km trail race here is distance from V2 and R2 well within GPS error. First V2 and second R2 with V2 right wrist and R2 left wrist. Last Saturday 18/04

Distance 85.76 Km 84.32 Km 1.44 Km (1.7%)

To be able to compare the raw data recorded with both watches, can you share the final distance shown in the graph in your www.sports-tracker.com/ activity information?
Maybe that raw distance is more similar in both watches than the showed distance, showing the shorting distance behavior also in your Race 2.

[isaac.net]

Hi,
I’ve done a new comparison, this time of an old running activity. The activity on Sports-tracker shows a distance of 9.52km, and the GPS points of the route are almost perfect. I marked the same route with an online distance calculator (https://www.calcmaps.com/), and the result was 9.67km, practically exactly the 1.5% difference mentioned in the thread.

Here are the screenshots:

[jjpaz]

@isaac.net said in Race 2 accuracy:

Hi,
I’ve done a new comparison, this time of an old running activity. The activity on Sports-tracker shows a distance of 9.52km, and the GPS points of the route are almost perfect. I marked the same route with an online distance calculator (https://www.calcmaps.com/), and the result was 9.67km, practically exactly the 1.5% difference mentioned in the thread.

Here are the screenshots:

If, in your SportTracker activity, you open the “graphs” menu, you can show activity information over the map. If you move to the right (end of the activity) maybe you could see a final distance close to the 9,67km (the “Raw” measured distance).

[isaac.net]

@jjpaz said in Race 2 accuracy:

@isaac.net said in Race 2 accuracy:

Hi,
I’ve done a new comparison, this time of an old running activity. The activity on Sports-tracker shows a distance of 9.52km, and the GPS points of the route are almost perfect. I marked the same route with an online distance calculator (https://www.calcmaps.com/), and the result was 9.67km, practically exactly the 1.5% difference mentioned in the thread.

Here are the screenshots:

If, in your SportTracker activity, you open the “graphs” menu, you can show activity information over the map. If you move to the right (end of the activity) maybe you could see a final distance close to the 9,67km (the “Raw” measured distance).

Yes, that’s right, in that case the distance it shows is 9.65 km. It’s clear that Race 2 correctly captures the GPS points but then processes them incorrectly. In my opinion, this should be a priority bug fix.

[jjpaz]

@isaac.net said in Race 2 accuracy:

@jjpaz said in Race 2 accuracy:

@isaac.net said in Race 2 accuracy:

Hi,
I’ve done a new comparison, this time of an old running activity. The activity on Sports-tracker shows a distance of 9.52km, and the GPS points of the route are almost perfect. I marked the same route with an online distance calculator (https://www.calcmaps.com/), and the result was 9.67km, practically exactly the 1.5% difference mentioned in the thread.

Here are the screenshots:

If, in your SportTracker activity, you open the “graphs” menu, you can show activity information over the map. If you move to the right (end of the activity) maybe you could see a final distance close to the 9,67km (the “Raw” measured distance).

Yes, that’s right, in that case the distance it shows is 9.65 km. It’s clear that Race 2 correctly captures the GPS points but then processes them incorrectly. In my opinion, this should be a priority bug fix.

I don’t know if it process de GPS data incorrectly, for sure it does it in a different way in comparison to other models.

[Brad_Olwin]

@jjpaz what I posted are raw data from JSON files in quantified self. One of the watch recordings is no longer in the Sunnto database. I believe 3% is the acceptable GPS error for handheld devices.

[dreamer_]

@Brad_Olwin I think that is valid for GPS but not for GNSS dual band devices (and even more when It seems something strange is happening with the Race 2 but not the others). Someone correct me, if I’m wrong.

[isaac.net]

@Brad_Olwin In my opinion, an error of more than 1.2km in a marathon (3% of 42km) is unacceptable under any circumstances, especially if all other devices measure close to the actual target (even the cheaper ones).