Garmin G500 Pilot's Manual page 216

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Figure 4-38 XM Weather - NEXRAD
Composite data from all the NEXRAD radar sites in the United States is shown.
This data is composed of the maximum reflectivity from the individual radar
sweeps. The display of the information is color-coded to indicate the weather
severity level. All weather product legends can be viewed on the Weather Data
Link Page. For the NEXRAD legend, select the LEGEND soft key when NEXRAD
is selected for display.
Figure 4-39 NEXRAD Weather Legend
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Garmin G500/G600 Pilot's Guide 190-00601-02 Rev. J