Altitude and barometer issues.
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@tomviv said in Altitude and barometer issues.:
around 8-9 hPa
If the altitude is set according to Google Earth Pro, then my barometer shows 10 - 11 hPa less than the actual pressure above sea level
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@tomviv @ist-1973 How do you know what the actual pressure is? This will vary depending on location and weather. I do not have a commercial weather site close to me so I cannot know exactly what the pressure is. My altitude will change when we have weather events. When I start an exercise FusedAlti will correct the altitude. I rarely adjust my altitude manually. The best way to do this is use the auto adjust, this requires the watch gets a good gps fix.
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@tomviv
in addition to @Brad_Olwin 's comment, I’d like to add that you might want to read pressure as a relative value only, not as an absoluteliving sideways
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@tomviv I live at sea level and just checked my S9P.
Watch: Alt 0m, Baro 1021hPa
3 Offical weather stations around me within 30km: 1019.1 - 1019.3 hPaWell within margins I would say and, as @freeheeler already mentioned, the speed in which pressure raises or drops is more important than the exact value.
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As an additional note, the baro sensors in our watches cannot be compared to a precision one used in most professional weather station, so there can be some discrepancies.
If you search the forum there is an old topic about pressure,sensors and precision
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@sartoric The height is the same. The pressure is different.
Which clock shows correctly?
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@ist-1973
that’s impossible to tell IMHO… what’s strange is that baro graph isn’t the same. did both watches stay together the past 12 hours? -
@freeheeler said in Altitude and barometer issues.:
did both watches stay together the past 12 hours?
And both should be in the same conditions, clean, not covered etc.
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@sartoric Yes. Together.
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@ist-1973 On the clock scale, the division price is different. 2 hPa, and 4 hPa
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@ist-1973 The conditions are the same. Together on a closet shelf.
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@ist-1973
strange… maybe you need to clean the sensor (soak it in water) and observe again -
@freeheeler
Today I went for a run with my wife along the same route. Here is the data.
Difference in watch pressure 9 hPa![1659269024817.jpg]
(/assets/uploads/files/1659269649255-1659269024817.jpg) 
![1659269024829.jpg]!
(/assets/uploads/files/1659269685098-111.jpg)
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@ist-1973
looks alright
I assume you can ignore the pressure difference as everything else looks good
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@freeheeler thank you. I think this is where I was going wrong although I’m assuming absolute pressure is at sea level, which is where I was for the week. Now I am back at home it makes more sense for the readings to be out by 8-9 hPa given my altitude.
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