Barometric pressure difference
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@Stefano-M64 I fully agree…
OP’s watch shows incorrect barometer value (that should imho report sea-level pressure, at least mine does and Suunto webpage also indicates this) but correct altitude. So, there is either a problem with the temperature sensor (since temperature correction is also used in the calculation) or something else (like if sensor reports wrong absolute value thats used for calculation)…
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@inkognito currently temperature shows on the watch (on the wrist) is exactly at 30°C and the watch pressure indicate 986hpa (for 973m of altitude which is the correct one).
And my house barometer indicates 1019hpa for 1018hpa by weather sources.
Comparing to the previous information given in my first message, seems to have an offset of -33hpa.I had one Ambit 3 Peak and one 9 Peak Pro in the past and pressure indicated by these watches was always matching the house barometer.
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@Chris_Dx that is your problem. Does the watch altitude change when you shake the watch ? IT can be dirty sensor
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@Dimitrios-Kanellopoulos No altitude is stable and sensor is clean.
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@Chris_Dx what is your town / location ? and what reading does the watch have atm ?
PS. no need for personal data, just a coarse location somwhere (town/ nearby town etc)/. So I can lookup the sea level pressure there
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@Chris_Dx said in Barometric pressure difference:
pressure indicate 986hpa
btw pressure indicate 986hpa looks bad for 973m of altitude
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Also note:
Relative pressure is the atmospheric pressure corrected to sea-level conditions.
To compare pressure conditions from one location to another, meteorologists correct the measured pressure (referred to as absolute pressure) to sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected pressure (the pressure your location would be at if located at sea-level) is higher than your measured pressure if you live above sea-level and lower than your measured pressure if you live below sea-level.
Relative pressure is larger than absolute pressure unless you live at or below sea-level.
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@Dimitrios-Kanellopoulos currently I am in Montrottier (France) altitude done by IGN map for my real position is 740m, altitude done by the watch is 756m but nothing abnormal. Temperature done by the watch positioned on my wrist is 30°C. Pressure done by the watch is 986hpa. And météo source give 1016hpa at 11am 1014hpa at 2pm.
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@Chris_Dx doesn’t sound correct friend. Has it always been like this?
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I will say that my race has the same issue. Only caveat, the pressure is spot on when the sensor/watch is wet. I thought this might be a sign of a dirty sensor but I have cleaned the sensor many many times to no avail. The sensor is consistently 0.3-0.4 inhg (sorry, imperial guy here) under the weather service measurements. Altitude always seems to accurately adjust to what I’m doing.
