Race Measured Distance 3 km more than actual distance

Ronnarong Wongmalasit

I am using Race running Tokyo Marathon. I am sure the race distance is correct but the watch measured distance 3km more than race distance.

Race distance 42km
Watch measured distance 45km

here is the race log: https://maps.suunto.com/move/ronwongmalasit/65e4257498b1941fe03b83a6

Look at the log i cannot see the segtion that watched driff off the router significanty not sure why it measured 3km more.

Note: I also connected watch with foot pod while running.

isazi

@Ronnarong-Wongmalasit if you have connected the watch to the footpod, the distance comes from the footpod.

Brad_Olwin

@Ronnarong-Wongmalasit it is possible to load the route and use snap to route feature as well,

@Brad_Olwin said in Race Measured Distance 3 km more than actual distance:

@Ronnarong-Wongmalasit it is possible to load the route and use snap to route feature as well,

And that way it would automatically correct the footpod distance in the app?

isazi

@cjanevate no, in that way it uses the route itself as the truth for distance also during activity. Basically the GPS is only used to determine where you are on the route, and the other parameters are populated by the route.

Anyway this is off topic, I have seen other good tracks of the Tokyo marathon with the Suunto Race, so in this case I believe the 3km in excess are because of the foot pod.

This post is deleted!

@isazi said in Race Measured Distance 3 km more than actual distance:

no, in that way it uses the route itself as the truth for distance also during activity

ok, thanks!

P.S: I’m new here and I see that all of my answers/posts are subject to moderation, for how long?

isazi

@cjanevate until you have some reputation, that you probably have at this point. Unfortunately it was necessary to avoid the current state of zero spam.

Ronnarong Wongmalasit

@isazi frp the manual

Calibrating foot pod
When you pair a foot pod, your watch automatically calibrates the pod using GPS. We recommend using the automatic calibration, but you can disable it if needed from the pod settings under Connectivity » Paired devices.

For the first calibration with GPS, you should select a sport mode where the foot pod is used and the GPS accuracy is set to Best. Start the recording and run at a steady pace on a level surface, if possible, for at least 15 minutes.

Run at your normal average pace for the initial calibration, and then stop the exercise recording. The next time you use the foot pod, the calibration is ready.

Your watch automatically re-calibrates the foot pod as needed whenever GPS speed is available.

Hence, when i run outdoor with GPS available, the watch should use the GPS as main distance source and footpod for cadence and calibrate foodpod as needed, isn’t it?

When run on threadmill them it use foodpod as main distance source.

isazi

@Ronnarong-Wongmalasit do you have calibration enabled or not? Anyway distance comes from the footpod, not GPS, GPS distance is only used to calibrate the footpod (if calibration is enabled) or not at all (if disabled).

Ronnarong Wongmalasit

@isazi yes, i have auto calibration on. If it is the case you say event running outdoor and GPS is available but the watch still use the footpod for distance is very bad algorithm. Since watch know that GPS is more accurate and it even using GPS to calibrate pod. Why it still use footpod for a distance calculation.

If it is true, Suunto need to look into this.

Tieutieu

I’m sorry this may be a little “off” discussion, but I’m just curious : why using a footpod ? What informations are provided that the watch could not ?

Elipsus

@Tieutieu there’s stuff like stride distance, air time, impact force, better evaluation of the running power

Brad_Olwin

@Ronnarong-Wongmalasit I used a Stryd for a long time and the distance was always off. It will not be corrected sufficiently by auto-calibration and I suspect given many different manufacturers this issue will remain. If you are using a Stryd you can instead use the S+ app, this will require you disconnect as footpod. A power-based footpod can be connected solely as a power pod to avoid your distance issue.

herlas

@Brad_Olwin I find default Stryd calibration to be pretty consistent and reliable from my experience, however it’s well known that even STRYD recommends setting auto calibration to off while setting up STRYD with a Suunto watch. Leaving it on and not performing an appropriate calibration protocol with GPS is likely to yield inconsistent erroneous results.

Ronnarong Wongmalasit

@Brad_Olwin I am using the Zwift pod just for my running on the treadmill. It was always attached on my running shoe. Seem like i need to tun it off manually when I run outdoor then. But still Suunto need to look into its algorithm on selecting which sensor to be use when running with GPS on/off.

isazi

@Ronnarong-Wongmalasit sorry but if you, the user, are telling the watch to use a sensor, why the watch should do something else than what you, the user, tell it to do? Should it turn off the HR monitor because it uses more battery even if you, the user, enable it?

Just enable the sensor indoor and disable it outdoor.

Brad_Olwin

@Ronnarong-Wongmalasit you have an answer then. You have found the Zwift pod accuracy is poor. Your choice whether you use it outdoors or not,