Autopilot Navigation; Autopilot Operation With Gpss Enabled Autopilots - Garmin G500 Pilot's Manual

5.6.4

Autopilot Navigation

The HSI may be used in conjunction with the appropriate navigation modes
of supported autopilots. The GDU 620 provides the autopilot with the selected
course and lateral/vertical deviations. The GDU 620 acts as a switching source
between the installed navigation sources (e.g GPS/VLOC, 1-2). The navigation
source that is displayed on the HSI is sent to the autopilot. Refer to the Airplane
Flight Manual and autopilot system documentation for instructions on how to
use the autopilot navigation functions.
GPS Steering (GPSS) provides roll command signals calculated by the GPS
navigator to the autopilot in order to allow the aircraft to anticipate turns, make
smooth transitions when passing waypoints, and fly leg types such as Procedure
Turns and Holding Patterns. The autopilot must have the ability to interpret the
GPSS commands. The G500 can provide GPSS information to autopilots that
have built-in support for GPSS commands, as well as to older autopilots that do
not have built-in support for GPSS.
Flight Plan Leg 1
Wpt 1
5.6.4.1

Autopilot Operation with GPSS Enabled Autopilots

Some autopilots have built-in support for GPS Steering (GPSS) commands
from a GPS navigator. 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.
190-01102-02 Rev. E
Wpt 2
Turn
Anticipation
Curve
Aircraft
Present
Position
Figure 5-30 GPSS Turn Anticipation
Garmin G500 Pilot's Guide
Flight Plan Leg 2
Wpt 3
5-33