Depending on the length of time the power was interrupted, your system may require GPS initialization.

If initialization is not necessary, the system proceeds directly to the Startup Confirmation screen.
If the system fails to locate a sufficient number of satellites to locate your position within 10 minutes, the following screen is displayed.

If you are experiencing GPS reception problems:
Disc Commands
DISC play
DISC play track # (#: 1 to 30)
DISC skip forward
DISC skip back
DISC track random*
DISC track repeat*
DISC track scan*
DISC folder up
DISC folder down
DISC folder random*
DISC fold ...
Instruments and Controls
This section gives information about the controls and displays that contribute
to the daily operation of your vehicle. All the essential controls are within easy
reach. ...
Towing a Trailer
Your vehicle is not designed to tow a trailer. Attempting to do so can void your
warranties. ...