If you are outside the reception area, the system could not work.
If you are on the fringe of the reception area, the station could mute due to weak signal strength.
Note:   If you are listening to HD1, the system changes back to the analog broadcast until the digital broadcast is available again. If you are listening to any other multicast channels, the station mutes and stays muted unless it is able to connect to the digital signal again.
Depending on the station quality, you could hear a slight sound change when the station changes between analog and digital audio.
You cannot access a saved HD station if your vehicle is outside the station’s reception area.