Garmin G3X Pilot's Manual page 88

Flight Instruments
GLIDEPATH - GPS SOURCE
The Vertical Deviation (Glidepath) Indicator (VDI) also appears to the left of the
altimeter during a GPS approach. The glidepath is analogous to the glideslope for
GPS approaches supporting WAAS vertical guidance (LNAV+V, L/VNAV, LPV). The
Glidepath Indicator appears on the G3X as a magenta diamond. If the approach type
downgrades past the final approach fix (FAF), "NO GP" is annunciated.
70
Vertical
Deviation
Source
Vertical
Deviation
Indicator
Vertical Deviation Indicator
(Glideslope-ILS Source)
Vertical
Deviation
Source
Vertical
Deviation
Indicator
Vertical Deviation Indicator
(Glidepath-GPS Source)
Garmin G3X Pilot's Guide 190-01115-00 Rev. F