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 Since learning that calibration interferes with Fusedalti, I calibrate my S9 only if I travel far away (by airplane) and don’t plan to have any activity for few days. Otherwise, even if I know it’s wrong, I rely on the watch figuring out things by itself. 
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 @Stefan-Kersting said in Issues altitude diagram: I wear the watch all the time even when taking a shower isn’t that enough? In fact it isn’t, as soaking it in warm water for a while let any dust or soap residue to be removed/washed away, while showering wearing the watch can lead to the opposite result 
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 Also for me looks more of a baro sensor dirty thing. Soap can condense there 2 things here also for others to know: Let the watch soak in water, flush under the tap making sure water goes in / out the pressure sensor holes. However and important: Do not leave the watch in the water for many hours. The watch is protected and is waterproof but leaving anything into water for a lot of time might affect components errosion etc. That is a personal tip. 
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 @Stefan-Kersting i also recommend not calibrating. FusedAlti may not activate if you manually calibrate. 
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 Hello, how are you? Sorry for this question. But I don’t understand, too well, what is the calibrate option for then? 
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 @Iván-Martín-Mora FusedAlti only weorks well if GPS reception is possible and at a certain quality. In deep valleys it could be not enough for proper altitude calibration. In these cases (or indoors without GPS) it is still possible to calibrate altitude manually. 
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 @Brad_Olwin without calibration it looks like this. The altitude displayed on the watch before I started it was -19 meters  
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 @Stefan-Kersting did you already try to clean the baro sensor? 
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 @Stefan-Kersting what is the altitude you would expect ? 0 ? 
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 @Dimitrios-Kanellopoulos starting at 5 masl. That is 100 percent sure altitude at home 
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 @Stefan-Kersting 
 Android app or iOS?
 With Android, there are raw data files in phone that can be imported in QS : you could see GPS altitude, and some other data that may help understand if fusedalti worked properly or not, of if GPS signal was good enough.
 https://forum.suunto.com/post/33052
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 @Mff73 no have iOS. But it could be nice to have information about the signal quality. Maybe a azimuth Display or something like that. But I don’t know if the problem lies there 
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 Did everything you guys recommend. Used Auto calibrate, manual calibrating, had the watch for half an hour in warm water. But when your supposed to start at 4 masl and finish at masl this result is absolutely unacceptable  
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 @Stefan-Kersting It could be the sensor is faulty too, hard to say. 
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 @Brad_Olwin when Auto calibrating, do you get a confirmation? I just have this screen even when outside and trying to auto calibrate  
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 @Stefan-Kersting I think no on Spartans. However you can set the altitude to 1000m and check if its changed 
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 @Stefan-Kersting 
 Never, but it say “in background” so … I never expected it but I noticed a blink in the watch face but I noticed a blink in the watch face
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 @Dimitrios-Kanellopoulos I get a gps position but after a manual calibration on 500 masl tja altitude isn’t adjusted when using auto calibration. Have to do it manually 
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 @Stefan-Kersting it needs up to 15 mins 
 




