hi @smbunn, The code was not modified. On a second thought, the altitude is just a simple function of the pressure, considering the same sea-level pressure. This is not ok, as the sea-level pressure varies in time, and from place to place. So, I would recommend, to use just the pressure, and if altitude is required, some arithmetics code has to be added, to get the right altitude. You could use some weather forecast service to obtain the accurate and real-time sea-level pressure.

I found out that like below, the results are plausible. No clue why the above mentioned way does not work, but at least this is a workaround.