"Marc Ramsey" ha scritto nel messaggio
et...
pressure setting for a specific reporting station. There will still be
discrepancies between pressure and geometric altitude at anything other
than the elevation of the station, as the average temperature of the air
column between will almost never match that modeled by the International
Standard Atmosphere. This discrepancy can amount to over 1000 feet at
10000 feet above the station on a hot summer day...


Marc are you saying that these devices such as Garmin's S serie (baro
sensors, temperature sensor for GPS altitude corrections) can be 1000 to
10000 feet wrong?

Thanks for answering
Paul