Gpss - Garmin G500 Reference Manual

GPSS

The GDU 620 will send the GPSS commands from the displayed GPS source
to the autopilot. For example, if GPS 1 is displayed on the HSI, the GPSS
commands from GPS 1 will be sent to the autopilot. Refer to the Airplane Flight
Manual and autopilot system documentation for instructions on how to use the
autopilot' s GPSS function.
NOTE: GPSS commands are not sent to the autopilot when a VLOC
source is displayed on the HSI.
In installations that use GPSS emulation in combination with the "heading"
mode of the autopilot, GPSS mode may be toggled on/off with an external switch
or by pressing and holding the HDG key on the PFD. If the installation uses the
HDG key on the PFD, the PFD knob window will display the GPSS/HDG mode
options.
NOTE: The GDU 620 has the ability to emulate GPSS roll steering for
autopilots that do not support GPSS. The GDU 620 emulates GPSS by
sending headings to the autopilot that guide turn anticipation.
When GPSS mode is on, the heading bug on the HSI changes to a hollow
outline and a crossed-out heading bug appears in the PFD Knob Mode Indicator,
indicating that the autopilot is not coupled to the heading bug. The bug is still
controllable and may still be used for reference. GPSS is annunciated in the lower
left portion of the PFD. The GPSS mode annunciation depends on the location
of the NAV STATUS information, as shown in the following figure.
190-00601-03 Rev H
PRIMARY FLIGHT DISPLAY (PFD)
GPSS OFF
GPSS Mode Control
NAV Status Style 1
GPSS Mode Annunciations
G500/G600 Cockpit Reference Guide
GPSS ON
NAV Status Style 2
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