AOA is calculated regarding all relative angles, such as airplane pitch while parked on a runway and during initial calibration and Angle of Incidence, as well as climb/descent path retrieved from GPS module. Not to be used as replacement for standard instruments, this app can give you very useful - and sometimes important or even life-saving - information about the attitude and actual angle of attack of your airplane. For more information please visit http://aoa-flight-assistant.dvanceit.si