Garmin G500 Pilot's Manual page 98

Class B/TMA Airspace Viewing Range
The Class B/TMA airspace viewing range option selects whether Class B/TMA
airspace information is shown on the Navigation Map. Class B/TMA airspace
information will be shown at and below the selected map range. When Off is
selected, the information will not be shown. In the example below where 200
NM is selected, Class B/TMA airspace information will be shown at map ranges
of 200 NM and lower.
Figure 3-55 Navigation Map Class B/TMA Viewing Range Selection
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Garmin G500 Pilot's Guide 190-01102-02 Rev. B