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:
Intersection
DEST button
►DEST Menu 2►Intersection
Select the intersection of two streets as the destination. The state or
province for
your current location is displayed at the top of the screen ...
Changing Your
Destination
There are four methods you can use to
specify a new destination during route
guidance.
►Say “Find Nearest…”
Searches for the nearest place/landmark
on the map screen (e.g., “ ...
Clock Adjustment
INFO button
► Setup ►Other
►Clock Adjustment►Clock Adjustment
Set the automatic adjustment of the system clock for daylight saving and
international time zones.
Select ...