2.7.3
Vertical Deviation Indicator (VDI)
The Vertical Deviation (Glideslope) Indicator (VDI) appears to the left of
the VSI whenever an ILS frequency is tuned in the active NAV field. A green
diamond acts as the VDI Indicator, like a glideslope needle on a conventional
indicator. If a localizer frequency is tuned and there is no glideslope signal, "NO
GS" is annunciated. The glideslope on an ILS approach is only shown if the
current heading is within 90° of the selected course. This prevents the glideslope
from being displayed during localizer backcourse approaches.
Figure 2-32 Vertical Deviation Indicator (ILS Source)
The vertical deviation is similar to the glideslope for GPS approaches
supporting WAAS vertical guidance (LNAV+V, L/VNAV, LPV). When an approach
of this type is loaded into the flight plan and GPS is the selected navigation
source, the Vertical Deviation Indicator appears as a magenta diamond. If the
approach type downgrades to LNAV past the final approach fix (FAF), or the
approach only supports LNAV service, "NO GP" is annunciated.
Figure 2-33 Vertical Deviation Indicator (GPS Source)
2-24
Vertical Deviation Source
Vertical Deviation Indicator
Vertical Deviation Source
Vertical Deviation Indicator
Garmin G500 Pilot's Guide
190-01102-02 Rev. E