Sony XA-NV100T - Manual (Page 15)

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Tap this part of the status bar to open the Route Summary screen.
To change the information shown in the status bar, tap Status bar in the Settings menu.
Driving View symbols
The following symbols are shown in the Driving View:
EPT - this symbol is shown when your device is using tacho informa-
tion to estimate your current location. EPT is only used when you
have no GPS reception.
Sound muted - this symbol is shown when the sound has been
muted.
To turn the sound back on, tap the middle panel in the status bar.