Garmin G3X Pilot's Manual page 47

System Overview
GPS Data
Magnetometer Data
Magnetometer Data
Air Data Air Data
AHRS no- AHRS no-Mag/
AHRS
AHRS Normal
Mag Mode no-Air Mode
no-GPS
Operation
Attitude/Heading Invalid
Heading Invalid Mode
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by
message advisory alerts. Any failure of the internal AHRS inertial sensors results in loss
of attitude and heading information (indicated by red 'X' flags over the corresponding
flight instruments). If the G3X senses that the magnetic heading measurement is valid,
but possibly outside of the internal accuracy limits, the numeric heading value on the
PFD is displayed in yellow.
Uncertain Heading
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190-01115-00 Rev. K Garmin G3X Pilot's Guide