Real world data

[A Former User]

I am wondering why the GPX track is wobbling around so much!? (blue is S9P, watch on left wrist, orange is Apex Pro, watch on right wrist)

Trailrun/Speedhike with poles up to 20% gradient:

Hiking slowly with kids without poles. S9P left wrist, Apex Pro right wrist.

This track is really ugly compared to the Apex Pro . Any ideas why this happened? Only on the right end S9P did it better than Apex Pro when we were playing on that little river.

[Dimitrios Kanellopoulos]

@_marcus_ do you use glonass on both?

[Dimitrios Kanellopoulos]

@_marcus_ also right wrist always has better gps. Fyi.

[A Former User]

@dimitrios-kanellopoulos same settings on both watches: GPS+QZSS, no GLONASS/GALILEO/BEIDOU

[A Former User]

@dimitrios-kanellopoulos ok, never heard of this. Why is it better on the right wrist?

[Dimitrios Kanellopoulos]

@_marcus_ actually I said it wrong. Left hand is better. That is because imagine you walking at a road. You walk at the right part and right you have trees wts

But if you want to test gnss please use the default setting (gps and glo) and same arm. Keep in mind that the watch that is higher should have a better signal.

[Dimitrios Kanellopoulos]

@_marcus_ regarding the wobble this is very interesting.

I wonder that the apex will record if you do a zig zag on a narrow road vs the s9P.

[A Former User]

@dimitrios-kanellopoulos it is a hiking trail and I did not walk around like a drunk person^^
The conditions on the worst part of the track:

And why is it ok on the way there but gets worse on the way back?

It is similar on hill repeats, more wobbling on the S9P.

[A Former User]

@dimitrios-kanellopoulos It used the same settings on both watches, I did not want to test especially GLONASS. I compared both with the same conditions except S9P on the left and Apex Pro on right arm.

[Dimitrios Kanellopoulos]

@_marcus_ Roger. I won’t argue. Just saying the the s9P is tuned for Glonass according to Sony. That’s why it’s the default. But I don’t argue to test that only. Just saying.

[A Former User]

@dimitrios-kanellopoulos ok, I activate GLONASS now. Did not know that S9P is optimized for that. Let’s see if it records better tracks

[A Former User]

@dimitrios-kanellopoulos

Question: Would it make sense to deactivate the options to only use GPS? Or does it still have any other significant advantages?

[Dimitrios Kanellopoulos]

@_marcus_ I am not so sure what you mean

[surfboomerang]

@dimitrios-kanellopoulos said in Real world data:

Just saying the the s9P is tuned for Glonass according to Sony

Interesting. Do you have more (technical) detail?

[Dimitrios Kanellopoulos]

@surfboomerang that’s Sony. No. Polar also has Glonass

[A Former User]

@dimitrios-kanellopoulos

In the options to choose which satellite systems to use, there is
GPS
GPS + GLONASS
GPS + GALILEO
GPS + BEIDOU

Why offering GPS only when it is a bad choice? What is the rationale?

Why records „GPS only“ that wobbling track?

[isazi]

@_marcus_ because the GNSS systems are dynamic systems, and what works one day in one place may not be the best another day or in another place.

[Dimitrios Kanellopoulos]

@_marcus_

It’s not that we offer a worse system.

It’s just that each area serves better a gnss system.

Additionally gps only (actually it’s also qzss) offer more battery life as well.

Glonass costs more
Galileo much more sometimes
Beidou the same with gps only.

I personally use glonass or beidou

It’s not that gps ads the wobble or something. That can be various things from precision attempts to bad coverage and much more. While having a smooth line like many times the s7 or apple watch has , this is also post processing or on the fly processing of removing outliers or simplifying a track. When I talk about accuracy and precision it can get complicated. Accuracy is different from precision but I want to express perhaps detail vs no detail.

That said I strongly suggest when testing just wear both watches on the same arm and use same gnss systems. Also let them soak for gps

[A Former User]

@Dimitrios-Kanellopoulos
This is now with GPS + GLONASS. Until the road fork I was running, afterwards “speed hiking”. Accuracy on hitting the gravel road is quite good (if the map is correct) but it’s still a very odd track. The track does not match my running path and I actually would expect a straighter/smoother track. Does it have an impact on the track length?

[Dimitrios Kanellopoulos]

@_marcus_ I don’t know tbh.

I would check with a reference watch. Arguably the Coros Apex pro is a very good gnss device.

There are several tools out there for this kinda analysis.