XCVario-21 upgrade to -23

The 2023 edition version is an improved version of the 2021 variometer model with can bus including AHRS sensor temperature control (less drift), an improved 3W loudspeaker with better performance at lower frequencies and less distortions, and comes with a brighter display with 1200 nits (!) and anti glare plus anti fingerprint surface that is perfect readable, even there is a reflex on the display.