HD Radio Indicator
The indicator appears when HD Radio is on and you tune to a station broadcasting HD Radio technology.
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The color of the indicator changes to indicate the system status.
Gray indicates the system is acquiring a digital station.
Orange indicates digital audio is playing.
Multicast Indicator
The multicast indicator appears if the current station is broadcasting multiple digital broadcasts. The highlighted numbers indicate additional digital channels available.
Note:   For stations that have more than one HD multicast, the HD indicator and radio text appears as a button. Press the button to cycle through all of the HD stations on that specific frequency.