Doubt about Suunto 9 Baro altimeter/barometer calibration
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@Mff73 May I ask how you did drive? Bike, Train, Car? My assumption is, that when you go ie. by car, it is not recognized as movement and therefore the altimeter stays on the “home” level. I think this is how fused alti works. Could it be that there are really 100m altitude difference between “home” and end of drive and vice versa?
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@johann-fuehrer
Thanks for answering.
I made a mistake
Altitude ok at home before and after activity in watch mode.
Ride by car from 550m to 1610m (real) without recording, so watch in “auto” mode . Not checked the altitude at start
Then hike from 1610 to 2110 real (summit) and here is Altitude vs GPS altitude.
Conclusion : no fusedalti in my hiking activity.
Btw, alti at home is OK before and after.
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@Mff73 I think to solve this we would need to know the trigger for an altitude change when in watch mode - so when the watch assumes you are moving or static. Maybe some wrist movements triggers this from time to time. That would explain, why the difference is “only” 100m and not the full 1000m difference from “home” to hiking start point.
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@johann-fuehrer
I know I’m a bit offtopic since I am an old fashioned Ambit guy, but it seems to be a topic about fused alti, too?!On Friday I went on a biketour (the one that we had to dig out our phones and maps for since we could not create a new route in MC and could not sync SA to Ambit…) and while we were in the gondola to get to the start of our tour (yes, sometimes I skip the pedalling part
) I did the calibration manually as automatic calibration with fused alti always takes ages…
In SA, I noticed later that the total ascent and the maximum altitude must be wrong. Also the altitude profile is not really what it looks like on the map…
The orange dot was at the actual highest point which is on the map at about 1’600m.
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@TELE-HO You are sure your baro is ok? It looks like it could not keep up with a “quick” altitude change when going up (and also when going down). If your baro holes are blocked (partially) it might be that the higher pressure from the base that you had in your watch, could not get out through this holes quick enough and therefore showing a wrong altitude (too low). But it seems that later this gets better. But strange in any way…
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@TELE-HO would be interesting to see the change compared to a real altitude graph…
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@johann-fuehrer
yes, almost new watch and I am aware of the baro holes issue from my earlier Suunto Core…
The activities before and after were recorded without any issue, like I am used to.
I am pretty sure I confused fused alti with manual setting while “climbing” in the gondola and then immediately starting the activity. -
@TELE-HO
this is roughly the graph of the route when I draw it in MC map.
living sideways
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@TELE-HO AFAIK if you manually calibrate the altitude while recording an activity, fused-alti will be disabled. not if you calibrate it before an activity. would be nice to see this activity in MC
because allways when fused-alti calibrates the altitude for more then around 8 meters, you see the pressure change in the baro diagram. -
@TELE-HO Is it possible for you to merge this one and the recorded one in to one graph? Maybe quantified.io is helpful? I did nor use it yet, but have seen a lot of such stuff is done in there by others…
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@johann-fuehrer Jup that is possible
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@mario_b
yes I am aware that you switch off fused alti when manual calibrating during an activity recording.
Here’s the sea level pressure with the altitude profile.@Dimitrios-Kanellopoulos
I don’t know who to do an overlay… but if I do an overlay, it would be necessary to have it almost idential from the drawn to the recorded track to have the best comparison, right?
living sideways
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@TELE-HO update 2 activiteis / routes to QS.
Select them on the table
Press merge
Use the distance axis when viewing -
@TELE-HO for a GPX track you can get “real” altitude information here i.e. https://www.gpsvisualizer.com/elevation but I do not know how exact that is…
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@johann-fuehrer … it’s a 30m x 30m grid SRTM1
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Runanalyze!
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@TELE-HO perfect. i think you’ve being right, as you said, that i could be, because you calibrated it on the gondola.
as you can see, fused-alti is correcting the altitude all the time on the activity to a higher altitude. is the altitude value on the end of the activity nearly correct? -
@mario_b
yes, it is absolutely correct at the end.I just noticed that I’ve had a GPS precision issue for the first 35minutes of this activity anyway. I wanted to redraw the exact route but saw that the signal was off track at the beginning… it does not make sense to overlay my recorded move with a drawn route I think.
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@TELE-HO so i would say, there is nothing wrong with your watch. looking at the ambient pressure at around 930 (which is not anough for the swiss the last weekend) i think it was only a faulty calibration at start. then fused alti kicked in, and corrected the altitude until it was nearly correct. (>1005 hpa at the end sound more possible too).
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@mario_b same opinion. Somewhere at 1 h 15 mins after start it started to look ok.
