IFD400 Series Pilot Guide
5-6 Navigation
of the Nav Source knob. The table below describes all possible
nav sources:
GPS is active (green), and all external deviation
data being transmitted by the IFD is in
reference to the active GPS leg.
Note that if no GPS leg is active or if no GPS
lock, the nav source will be displayed in yellow.
LPV
L/VNAV
LP
LP+V
LNAV
LNAV+V
If performing an RNAV approach, “GPS” gets
replaced with the approach type when the leg to
the FAF becomes active and either the
approach is VTF or the course to the FAF is
within 45° of the final approach course.
GPS LPV
GPS L/VNAV
GPS LP
GPS LP+V
GPS LNAV
GPS LNAV+V
Basic GPS is active (green), and the approach
type is armed (blue).
A visual approach is active (green)
GPS is active (green), and VLOC is armed
(blue).
If the GPS flight plan contains a VHF procedure
or leg (e.g. localizer final), then the nav source
will automatically transition from GPS to VLOC
when the capture criteria have been met. While
GPS is active, all external deviation data being
transmitted by the IFD is in reference to the
active GPS leg. That transitions to VHF
deviation data when the switch to VLOC is
made.
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