Altimeters measure pressure, which is a function of altitude and barometric pressure. Normal fluctuations in barometric pressure will change the measured altitude at a fixed location.

A change is barometric pressure at standard sea-level pressure (29.92 in Hg) of 1 inch results in a change in measured altitude of 925 feet. To a lesser extent, barometric pressure (altitude) is also a function of temperature.

Thus, you must calibrate the altitude on a daily basis from a fixed location.

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