Garmin G5 Pilot's Manual page 18

System Overview
1.4.1.1 G5 ATTITUDE
The G5 calculates aircraft attitude using information from its built-in inertial sensors.
The G5 also uses GPS and airspeed data to provide the most accurate attitude
information. The G5 should display valid attitude within the first minute of applying
power.
If the G5 senses the attitude solution is valid, but not yet within the internal accuracy
limits, "ALIGNING" is displayed. The displayed attitude information is still accurate
and usable while this indication is shown. The G5 can align itself both while taxiing
and during level flight.
If the G5 senses the attitude solution is invalid, "ALIGNING KEEP WINGS LEVEL" is
displayed. No attitude information is displayed while this indication is shown. The G5
can align itself both while taxiing and during level flight.
Figure 1-5 Attitude Aligning Keep Wings Level Indication
If the G5 inertial sensors fail, "ATTITUDE FAIL" is displayed in addition to a red 'X'
over the display. No attitude information is displayed while this indication is shown.
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G5 Electronic Flight Instrument Pilot's Guide for Certified Aircraft
Figure 1-4 Attitude Aligning Indication
Figure 1-6 Attitude Failure Indication
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