I note an AOA indicatoe has been added to the iFly. I have the 740 and Stratux. Theoretically this could be implemented using GPS data for ROC and AHRS data for AOA. I note for instance that the AV30 works in this way. For the AV30 bottom green line is set to AOA at Va and bottom red line set for AOA when stall warning alerts. I am unable to find the utility for activating/calibrating this instrument. What do I need to do or add to make this AOA instrument functional?