GPS normal?

TheGuyFromTheSummit

@dmytro
Sometimes I change the route during the run and so snap to route won’t work.
Even during a race the actual paths was different to the gpx track and messed up the data using snap to route.

I just want the old performance back

DMytro

@theguyfromthesummit ok, I see. Well, If you think it’s firmware related, you might want to try flashing an old one, they are linked somewhere in the forum. Beware, flashing an older FW deletes all your watch data.

TheGuyFromTheSummit

@dmytro thanks I will have a look.

But does anyone else experience such drop in accuracy?

Shrek3k

@theguyfromthesummit (Un)Fortunately not at all. I have a non-baro 9, and although I see some bad sections when the area is really hard on GNSS, I usually have a good track. Just yesterday I ran 8 km on a track, and it worked quite well (area is not covered or bad for GNSS, but nevertheless…), and on a “regular” route the track is at least not ‘nervous’.
I usually only use GPS, currently I activated Beidou and before that Galileo to check if there is any real improvement … which I do not notice in my areas.

TheGuyFromTheSummit

@shrek3k hmmm your track look really nice.
But I guess there is not much I can do about it …

Łukasz Szmigiel · S9PP 2.37.48

@theguyfromthesummit just a thought - have you tried wearing your watch differently? Ie. higher or lower or maybe tighter? This is just me doing a wild guess but maybe Suunto is using motion data along GPS for its smoothing / denoising algorithm?

DMytro

@theguyfromthesummit also if you don’t care about your looking at your watch during an activity, I’ve read fastening your watch to a backpack facing screen up dramatically increases its accuracy. The reason being an improved position of watches antenna and less wobble.

TheGuyFromTheSummit

@łukasz-szmigiel I always wear the watch the same way. But it is really interesting, that the track gets much better when speeding up (<5:00 pace).
So maybe they changed something connected with the speed.
Today I will try the “hiking” sports mode and see if the track gets better (Idea behind: hiking is usually much slower than trail running, so Suunto flattens the track more in hiking mode, because each GPS measurement will be closer in terms of distance, so they expect more jumping than at a faster pace.)

TheGuyFromTheSummit

@dmytro Thanks, but I need my heart rate and time during my runs

@theguyfromthesummit enjoy running uphill trails with a <5min pace

TheGuyFromTheSummit

@_marcus_ jep, this is the problem
But as long as I can be sure, that the distance and ascent is precise, I do not mind the GPS track.

So further testing has to be done

@theguyfromthesummit but that‘s the question. Elevation most of the time is the same than with my Apex Pro during trailrunning. But distance is not. S9P always records more km. Today Apex Pro 11,39km/504m+ vs S9P 12,14km/496m+. Of course I don‘t know which is correct. But seeing the track makes me think that S9P overestimates the distance a bit. Ok, in the end you get a better pace with S9P

TheGuyFromTheSummit

@_marcus_ I also saw this comparing my S9B and a Forerunner 945
Usually S9B has +0.5-1.5km …

jokeen2020

I’ve a similar discrepancy in distance between an Ambit 3 Peak/ Polar M450 and S9B. The distance is always a little longer on the S9B for both Cycling and Runs.

Also the GPS tracks on the S9B never look quite as smooth as the other devices. Similar to the ‘jagged’ tracks on the screenshots in this thread.

Maybe the ‘jagged’ tracks are where it’s picking up the little bit of extra distance?

I’ve tried different GPS settings and soft resets, but nothing helps.

I actually tend to use the Ambit 3 Peak as my default device because I know it’s more accurate. Especially if I’m pacing a run.

MdzOtt

@jokeen2020 If you use auto-pause, the distances differ, because different devices are more or less aggressive about what constitutes “moving” and what is a pause.

MdzOtt

@theguyfromthesummit occasionally, there are issues with the GPS (the system itself). I am not saying that this is the case, but it happened to me that a track was completely off one day and the next it was back to normal.

TheGuyFromTheSummit

@mdzott It behaves like this for at least 2 months now. So I don’t know where this is coming from

jokeen2020

@mdzott

I don’t use the auto-pause on any of my devices.

TheGuyFromTheSummit

@jokeen2020 Same here, I don’t trust it

Egika

@theguyfromthesummit have you tried just GPS only without any additional system?
In the mountains with challenging conditions usually I get good results with GPS+GLONASS though.

I remember the Sony chipset had this wobbling issue at the beginning.
Just to check: It your watch firmware up to date?
Have you tried to follow the procudure:

soft reset watch (12 upper button)
load AGPS data from the Suunto App
wait a few minuted for the watch to parse the data
get GPS fix
wait a little for the GPS fix to stabilize before heading off

Cheers from northern Germany