TomTom 4EN42 - Manual (Page 70)

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Alert settings
Tap this button to set the alerts you will receive and the sounds used for
each alert.
Disable alerts
Tap this button to disable alerts.
Enable report
button
Tap this button to enable the report button. The report button is shown in
the Driving View or in the quick menu.
When the report button is shown in the Driving View, this button changes
to Disable report button.