Mazda 3 Sedan 2019 Manual page 61

Features
Entertainment
Alternative frequency (AF)
AF functions on FM stations. Enable "Alternative Frequency Settings" by the FM Settings.
If the radio reception of the current station weakens, the system switches to an alternative
station automatically.
Region Lock
Region Lock functions on FM stations. Enable "Region Lock Settings" by the FM Settings.
When traveling to another country, the setting automatically switches to a program the same
as the program being listened to, or to a related program.
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