Garmin G500 Pilot's Manual page 49

Selected Soft Key
Unselected Soft Key
When a soft key is selected, its color changes to black text on gray background
and remains this way until it is turned off, at which time it reverts to white text
on black background. When a soft key function is disabled, the soft key label is
subdued (dimmed).
NOTE: If a soft key is pressed and held for longer than 1 second, it is
ignored.
AP Test
The AP TEST soft key is available if the GAD 43 is used to provide attitude
information to an autopilot. The AP TEST soft key disengages the autopilot as
part of the GAD 43 test.
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.
190-00601-02 Rev. J
Unselected Soft Key
Soft Key Not Available
For Selection
Figure 2-4 PFD Soft Key Layout
Garmin G500/G600 Pilot's Guide
TOC Cover
Soft Key Labels
Soft Keys
Soft Key Labels
2-3