In message , R.Wieser
 writes
>Do you perhaps still know what the difference in pressure was for you ?
>Currently it looks that my 20 meters altitude translates to almost 8 points.
>

My local airfield is giving 1004hPa (at 29m altitude), my BME280 is
giving 994, so using the 1hPa/27ft quoted by Tauno Voipio, that suggests
a 270ft (~93m) difference in altitude, whilst the map suggests 71m.
Which doesn't sound right, but the trend is right.

Adrian
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