Garmin G500 Pilot's Manual page 72

Cover TOC
NOTE: If the NAV course pointer is displayed for the active navigator
when the approach is activated and the localizer frequency is tuned, the
pilot will need to switch to another CDI source and then back to NAV
for the course pointer to Auto-Slew.
For example, if NAV1 is currently selected, the pilot must:
press the CDI soft key twice: NAV1>GPS1>NAV1
OR
press the 1-2 soft key twice: NAV1>NAV2>NAV1
NOTE: For LOC BC approaches, the course pointer will slew 180 degrees
from the inbound course.
Example of activating Auto-Slewing in the G500/G600:
Course Pointer slewed
to 313° for the ILS
Figure 2-35 Auto-Slewing HSI with ILS Loaded
(Shown with Corresponding Approach Plate)
2-26
Garmin G500/G600 Pilot's Guide 190-00601-02 Rev. J