GPS 400 Pilot’s Guide and Reference
190-00140-60 Rev. E
9-4
SECTION 9
TERRAIN
9.3 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 9-2). Annunciations are
color-coded according to Table 9-2.
Figure 9-2 TERRAIN Annunciation Field
TERRAIN Annunciation
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.
Pop-up terrain alerts (Figure 9-3 & 9-4) 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
pop-up alert and returns to the currently
viewed page.
• Press the
ENT
Key. This acknowledges the
pop-up alert and accesses the TERRAIN Page.
Figure 9-3 TERRAIN Advisory Pop-up
Figure 9-4 TERRAIN Caution Pop-up (Flashing)
