Garmin G500 Pilot's Manual page 166

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Obstacle Icons
NOTE: If an obstacle or terrain cell and the projected flight path of the
aircraft intersect, the display automatically zooms in to the closest threat
location on the TAWS page.
With the exception of power lines, any number of obstacles within close
proximity of each other may display as a group on the Navigation Map. The
MFD groups obstacles when they would otherwise overlap at the current zoom
scale. When a group is drawn, only the most immediate threat is depicted. An
asterisk at the upper left of an obstacle indicates that it is a group. The relative
altitude of the highest obstacle in the group determines the asterisk' s color.
To view obstacles individually, increase the current zoom scale.
Icon
Color
Red Obstacle is at or within 100 ft below current aircraft altitude
Obstacle is between 100 ft and 1,000 ft below current aircraft
Yellow
altitude
Obstacle is between 1,000 ft and 2,000 ft below current aircraft
White
altitude
4-10
Unlighted Obstacle (height is less than 1,000 ft AGL)
Lighted Obstacle (height is less than 1,000 ft AGL)
Unlighted Obstacle (height is greater than 1,000 ft AGL)
Lighted Obstacle (height is greater than 1,000 ft AGL)
Windmill
Windmill in Group
Power Line
Table 4-3 Obstacle Icon Types
Table 4-4 Obstacle Altitude Color Descriptions
Garmin G500/G600 Pilot's Guide
Description
Description
190-00601-02 Rev. J