TomTom ONE - Manual (Page 36)

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The following symbols are shown at the top of the Traffic sidebar:
Tip : The yellow circle is shown at the top of the Traffic sidebar if your device
cannot find a suitable radio station. You can make your device try again to find
a suitable station by tapping Tune automatically in the traffic menu. If you
know the FM frequency of a station that broadcasts RDS-TMC traffic
information, you can tune to it manually. For more information see Setting the
radio frequency for RDS-TMC information (39).
Your device is looking for a radio station with RDS-TMC traffic
information.
Your device has found a suitable radio station and is checking for
the latest traffic information.
Your device is tuned to a radio station and receives RDS-TMC
traffic information when available.