The instant vario feature requieres a user calibration for best performance.
Help of another object will help you achieving the correct orientation. It can be a pen, book, rubber eraser, or anything else.
Calibration procedure will start automatically when upgrading to V3.x.
SETUP
Once the update is done, follow the following procedure, step by step :
STEP 10: repeat STEP 1 to 9
Once this calibration sequence made, start over with the validation sequence, from STEP 1 to STEP 9 one more time.
A success rising tone will inform you of correct calibration.