Garmin G500 Reference Manual page 27

Switching Between Navigation Sources
The Course Deviation Indicator (CDI) can display two sources of navigation:
GPS or NAV (VOR or LOC). Press the CDI soft key to toggle between the available
CDI modes, (GPS or VOR).
If a second GPS source or NAV source is available, pressing the 1 - 2 soft key
will toggle the navigation sources (VOR1 and VOR2, or GPS1 and GPS2).
NOTE: Verify the navigation source by the indication on the HSI.
NOTE: The selected navigator is the source for all PFD and MFD
functions, except for bearing pointers and external TAWS PFD
annunciations.
190-01102-03 Rev G
GPS
NAVIGATOR 1
GPS
NAVIGATOR 2
CDI Sources
G500 Cockpit Reference Guide
PRIMARY FLIGHT DISPLAY (PFD)
VLOC
NAVIGATOR 1
VLOC
NAVIGATOR 2
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