Garmin G3X Touch Pilot's Manual page 60

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 Touch as a magenta diamond. If the approach
type downgrades past the final approach fix (FAF), "NO GP" is annunciated.
42
Vertical
Deviation
Source
Vertical
Deviation
Indicator
Vertical Deviation Indicator
(Glidepath-GPS Source)
Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. A