On Wed, 1 Jul 2020 10:07:21 +0200
"R.Wieser"  wrote:

> Assuming that the readout of the sensor is correct (which is an easy
> assumption, seeing that its carefully calibrated) I must conclude that my
> (roughly estimated) altitude is the one thats incorrect.

 I refer you to A Dumas' point elsethread - to quote:

> The vertical gradient isn't so precisely fixed, it depends on the
> temperature. Approximately varies between 11 and 13 Pa per metre at sea
> level, which means the error might be more than 10% right from the start.
> See https://en.wikipedia.org/wiki/Barometric_formula

 Add that 10% to your other sources of error and I think you'll find
you're doing quite well to be as close as you are.

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