Power Acoustik PTID-4333NR Owner's Manual page 34

Quick Access Key [NAVI]
Under any working mode, hold on pressing the [MENU/NAVI] button to switch to
NAVI mode; hold on pressing the [MENUNAVI] button again to return the previous
working mode. For example, under Radio mode, hold on pressing the [MENU/NAVI]
button to switch to NAVI mode; hold on pressing the button again to quit the NAVI
mode and return back the Radio mode.
Enter the NAVI mode by Quick Access Key, the previous working mode is still
working on background. For example, under Radio mode, hold on pressing the [NAVI]
button to switch to NAVI mode, and you can still listen to the radio stations. But when
voice of Navigation comes, the radio will be interrupted until voice of Navigation ends.
No NAVIBOX Connection
Touch the "NAVI" icon to enter the following screen if the NAVIBOX not connected:
1. Current Source Indicator
Displays the source currently playing, touch to return the main menu.
2. Mute
Touch to switch off the sound; touch it again to resume to the previous volume level.
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