Garmin GNC 420 - Manual (Page 185)

GNC 420(A) Pilot’s Guide and Reference 10-5
SECTION 10
TERRAIN
Table 10-2 shows the possible TERRAIN alert types with corresponding annunciations.
Alert Type Annunciation Pop-Up Alert
TERRAIN Failure None
TERRAIN Inhibited None
TERRAIN Not Available None
Required Terrain Clearance (RTC) Advisory
Required Terrain Clearance (RTC) Caution
(FLASHING) (FLASHING)
Imminent Terrain Impact (ITI) Advisory
Imminent Terrain Impact (ITI) Caution
(FLASHING) (FLASHING)
Required Obstacle Clearance (ROC) Advisory
Required Obstacle Clearance (ROC) Caution
(FLASHING) (FLASHING)
Imminent Obstacle Impact (IOI) Advisory
Imminent Obstacle Impact (IOI) Caution
(FLASHING) (FLASHING)
Premature Descent Alert (PDA) Advisory
Table 10-2 TERRAIN Alert Summary
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