Garmin G500 Pilot's Manual page 28

AP Test
The AP TEST soft key is available if the GAD 43 is installed and providing
attitude to an autopilot. The AP TEST soft key disengages the autopilot as
part of the AHRS test.
NOTE: "AP TEST" is not available for all installations.
CDI
The CDI soft key toggles between the selection of GPS or VOR/LOC as the
active navigation source. In a single GDU 620 system, the GDU CDI soft
key will change the source in the connected navigator and making a source
change in the navigator will be reflected in the GDU 620. In a dual GDU 620
system, the CDI keys in the navigator will be disabled.
1-2
The 1-2 soft key toggles between the available receivers for selected navigation
source (i.e. GPS1 and GPS2 or VOR/LOC1 and VOR/LOC2). This soft key
will only be present if the system is configured for a second GPS or VOR/
LOC.
PFD
Pressing the PFD soft key displays the BRG1, BRG2, and BACK soft keys.
The BRG2 soft key will only be present if the system is configured for a
second GPS or VOR/LOC receiver.
BRG1
The BRG1 soft key cycles through the available bearing 1 indicator modes
(NAV1, GPS1, ADF, or None).
BRG2
The BRG2 soft key cycles through the available bearing 2 indicator modes
(NAV2, GPS2, ADF, or None). This soft key will only be present if the system
is configured for a second GPS or VOR/LOC.
SYN VIS
The SYN VIS soft key is available if Synthetic Vision Technology™ is installed.
It enables Synthetic Vision and displays the associated soft keys.
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Garmin G500 Pilot's Guide 190-01102-02 Rev. B