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:
Audio System Basic Operation
To use the audio system function, the ignition switch must be in ACCESSORY
or
ON .
Use the selector knob to access some audio
functions.
Selector knob: Rotate left or right to scroll
throug ...
Safe Driving
...
Map Scale Commands
Display north up
Display heading up
Display zoom in
Display zoom out
Display (specify scale):
1/20 mile (80 m) scale
1/8 mile (200 m) scale
1/4 mile (400 m) scale
1/2 mile (800 m) scale
1 mil ...