Garmin G3X Installation Manual page 343

5. Ensure that aircraft and AHRS comply with all on-screen instructions, press the START softkey.
NOTE
Per the following figure, GSU 73 units must have the AHRS pitch and roll within 3 degrees
of level, GSU 25 units must have the AHRS pitch and roll within 30 degrees of level.
6. "Pitch/Roll Offset Calibration in Progress" appears on the display along with calibration
information. The GSU 73 pitch/roll offset procedure completes in a few seconds. The GSU 25
pitch/roll offset procedure has a 30 second countdown timer that resets when the aircraft moves.
190-01115-01 G3X Installation Manual - Post Installation Checkout and Calibration Procedures
Rev. L Page 19-11