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Garmin 400-500 User Manual

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Section 3
TERRAIN Alerts
TERRAIN Alert Summary
Table 3-2 summarizes the TERRAIN alerts.
Table 3-2: TERRAIN Alerts Summary
Alert Type
Annuciation
Pop-Up Alert
TERRAIN Failure
  None
TERRAIN Inhibited
  None
TERRAIN Not Available
  None
Required Terrain Clearance (RTC) 
Advisory
Required Terrain Clearance 
(RTC) Alert
(FLASHING)
(FLASHING)
Imminent Terrain Impact (ITI) 
Advisory
Required Terrain Impact (ITI) 
Alert
(FLASHING)
(FLASHING)
Required Obstacle Clearance 
(RTC) Advisory
Required Obstacle Clearance 
(RTC) Alert
(FLASHING)
(FLASHING)
Imminent Obstacle Impact (IOI) 
Advisory
Imminent Obstacle Impact (IOI) 
Alert
(FLASHING)
(FLASHING)
Premature Descent Alert (PDA)