Terrain Alerts - Garmin GNC 420(A) Pilot's Manual & Reference

SECTION 10
TERRAIN

10.3 TERRAIN ALERTS

TERRAIN Alerts are issued when flight conditions
meet parameters that are set within TERRAIN software
algorithms. TERRAIN alerts typically employ either an
ADVISORY or a CAUTION alert severity level, or both.
When an alert is issued, visual annunciations are
displayed.
Annunciations appear in a dedicated field in the lower
left corner of the display (Figure 10-2). Annunciations
are color-coded according to Table 10-2.
TERRAIN Annunciation
Figure 10-2 TERRAIN Annunciation Field
NOTe: TerraiN advisory alerts are displayed
as constant black text on a yellow background;
TerraiN Caution alerts are displayed as flashing
black text on a yellow background.
10-4
Pop-up terrain alerts (Figure 10-3 & 10-4) can also
appear during an alert, but only when the TERRAIN Page
is not displayed.
There are two options when an alert is displayed:
• Press the CLR Key. This acknowledges the
• Press the ENT Key. This acknowledges the
GNC 420(A) Pilot's Guide and Reference
pop-up alert and returns to the currently
viewed page.
pop-up alert and accesses the TERRAIN Page.
Figure 10-3 TERRAIN Advisory Pop-up
Figure 10-4 TERRAIN Caution Pop-up (Flashing)
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