How to calibrate The compass on GM rearview mirrors

Autodimming temperature/compass mirror in a Chevy trailblazer:
https://www.youtube.com/watch?v=0AEOBomkvX0&t=4s

Calibrating the compass and setting compass variance on My recently installed Rearview mirror in my 2005 Chevy Trailblazer.
Applies to

02-09 Chevrolet Trailblazer,
02-09 Gmc Envoy,
02-04 Oldsmobile Bravada,
03-07 Isuzu Ascender,
04-07 Buick Rainier
05-09 Saab 9-7X
98–07 Chevy Silverado / GMC Sierra
00–06 Chevy Tahoe / GMC Yukon
00–06 Chevy suburban / GMC Yukon XL
01-06 Chevy Avalanche
02-06 Cadillac Escalade

 as well as any other GM vehicles with Gentex Autodimming compass mirrors.

Видео How to calibrate The compass on GM rearview mirrors канала pfun41