Garmin gnc 420 User Guide

GNC 420/420A Pilot’s Guide and Reference

6-26

3)  Fly  the  outbound  course.    Once  cleared  to 

sequence to the next leg, press the OBS Key.  
Confirm that ‘SUSP’ no longer appears directly 
above  the  OBS  Key.   An  alert  (‘NEXT  DTK 
186°’) appears in the lower right corner of the 
screen (Figure 6-72) to provide guidance to the 
next waypoint (HFD VOR).  The actual desired 
track (DTK) depends on the ground speed and 
distance from HFD VOR.

4)  Once the OBS Key is pressed, the GNC 420 

automatically  sequences  to  each  waypoint 
along the remainder of the departure route, 
including the selected transition.

6.3  POINTS TO REMEMBER FOR ALL 

APPROACHES

•  The GNC 420 is designed to complement printed 

approach plates and vastly improve situational 
awareness throughout the approach.  However, 
the pilot must always fly an approach as it appears 
on the approach plate.

•  The active leg (or the portion of the approach 

currently in use) is depicted in magenta on the 
Map Page.  When flying the approach, the GNC 
420 automatically sequences through each leg 
of the approach unless ‘SUSP’ appears above 
the OBS Key.  ‘SUSP’ indicates that automatic 
sequencing of approach waypoints is suspended 
on the current leg and normally appears at 
holding patterns and upon crossing the missed 
approach point (MAP).