Just to muddy the waters a little more wrt altitude accuracy, although these I2C sensors are very accurate, in a light aircraft with an enclosed cockpit the sensor will be indicating cabin pressure. This could be quite different to static pressure. Totally useless in a pressurised cabin of course.
Aaahhh yes, I was wondering when somebody was going to notice that one
(apologies to Capt. Mainwaring)
Yes clearly you are right.
I think in this instance, there are only two potential solutions
1. PilotAware needs to be outside the pressurized cabin.
2. The BMP sensor needs to be overriden and use GNSS with a dialled in QNH
this is already supported through the web interface, except when the system recognizes
a BMP sensor, it ignores the dialled in pressure
seems like the dialled in pressure needs an 'auto' select capability