Race 2 accuracy

[isaac.net]

Hi,
To contribute to the thread, today I did a mountain bike ride with my Race 2 Titanium and a Garmin 530. The difference was only 40 meters: Race 2, 30.98km vs Garmin 530, 31.02km.
Regards

[isaac.net]

I’m commenting to myself to point out that, however, the distance after applying Strava’s distance correction increased to 31.45 km. I assume Strava performs the correction using 3D distance (taking into account the terrain’s elevation), which in this case was 840 m of positive elevation gain.

Related to this, does anyone know if this parameter can be applied to the distance calculation? I haven’t seen it on Suunto, but Garmin has the option, although it’s disabled by default.

Regards

[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.