Garmin G1000 Pilot's Manual page 94

FLIGHT INSTRUMENTS
When the radar altimeter is selected as the altitude source for the minimum descent altitude alerting function
(Figure 2-43), the color of the radar height changes to amber upon reaching at or below the MDA/DH (Figure
2-44).
A ground line (Figure 2-45) appears on the Altimeter to display the aircraft' s height relative to the ground.
Diagonal lines appear underneath the ground line. If the radar altimeter provides invalid data, the message "RA
FAIL" is displayed in amber in the RA box (Figure 2-46).
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Figure 2-43 RAD ALT Setting
(References Window)
Figure 2-44 RA as Altitude Source for MDA/DH
Radar
Altimeter
Radar Altimeter
Minimums Box
Figure 2-45 Altimeter Displaying the Ground Line (RAD ALT)
Figure 2-46 Radar Altimeter with Invalid Data
Garmin G1000 Pilot's Guide for the Diamond DA42NG
Ground
Line
190-00962-04 Rev. A