Sure Kevin, :)
The thing i meant is the sensor warming up problem.
It is related to a design flow of the hardware. (It should measure external temp, not "internal")
Like the barometric sensor is located on the main board, it heats up wit APM a bit.
But as it has temperature compensation it makes APM think that the air around is warmer, so the hight measurement is wrong.
So your home alt can be a few meters wrong.
Also it can be a problem for other sensors we use.
I overcome this by powering up my APM than wait, than reboot, so my HA on zero alt will be accurate.
It would be a very useful feature to be able to do this without reconnecting the battery. (full reboot)
In MP, i have just noticed this function. it is on actions tab called PREFLIGHT_CALIBRATION.
(It also has PREFLIGHT_REBOOT)
If you could add this, i would be pleased. (Even more! ;) )
Thank you for your attention,