Garmin G3X Pilot's Manual page 318

Annunciations & Alerts
Message
Magnetic anomaly - Check mag
installation
Magnetometer data invalid
Magnetometer failure
Navigation database mismatch
Navigation database missing
Network fault - Duplicate GDU
detected
Network address changed
Not receiving autopilot RS-232
data
Not receiving external GPS RS-
232 Aviation data
300
Comments
An anomaly has been detected in the
magnetometer data. Heading may or may not
be flagged invalid.
The data being communicated by the GMU
is invalid. Heading is flagged invalid and the
AHRS will use GPS for backup mode operation.
The G3X system should be serviced.
Communication has been lost or a fault has
been detected in the GMU. Heading is flagged
invalid and the AHRS will use GPS for backup
mode operation. The G3X system should be
serviced.
The PFD and MFD have different navigation
database versions installed. Install the correct
navigation database on all displays for proper
operation.
The navigation database is missing. Install the
correct navigation database on all displays for
proper operation.
A duplicate GDU has been detected on the CAN
bus. If the problem persists, the G3X system
should be serviced.
One or more GDUs on the CAN bus have an
indeterminate network address. This likely
indicates a wiring issue or an intermittent
connector pin. If the problem persists, the G3X
system should be serviced.
Not receiving RS-232 data from integrated
autopilot unit.
Not receiving RS-232 data from external GPS
navigator.
Garmin G3X Pilot's Guide 190-01115-00 Rev. G