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:
Gauges
TripMeter
This meter shows the number of miles (U.S.) or kilometers (Canada) driven since
you last reset it.
There are two trip meters: Trip A and Trip B. Switch between these displays by
pres ...
Reporting Errors
You can help to improve database
accuracy by reporting any errors you
encounter.
• Report errors in freeways and main
“verified” roads shown in black on the
map at http://mapreporter.navteq ...
Radio Theft Protection
Your vehicle’s audio system will disable itself if it is disconnected from electrical
power for any reason.
To make it work again, you must enter a specific five-digit code in the preset
button ...