Power Acoustik PTID-7002NR 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
Display 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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