Garmin G500 Pilot's Manual page 78

North Up At
The North Up At option allows you to select the map range where at and
above the selected value the Map Orientation will automatically change to
North Up. For example, with the 500 NM value selected in the figure below,
when the map range of the MFD is 500 NM or more, the map orientation will
automatically become North Up.
Figure 3-18 Navigation Map "North Up At" Orientation Range Selection
3-14
Garmin G500 Pilot's Guide 190-01102-02 Rev. B