Power Acoustik PTID-8940NRBT Gen 2 Owner's Manual page 48

Quick Access Key [NAVI]
Under any working mode, press the [NAVI] button to switch to NAVI mode; press the
[NAVI] button again to return the previous working mode. For example, under Radio
mode, press the [NAVI] button to switch to NAVI mode; press the [NAVI] 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, press 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:
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