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:
Driving to Your Destination
This section describes how to follow the route guidance to your destination,
and
choose the icons displayed on the map screen. ...
Tools
Types of Tools
The tools were stored in the cargo area. ...
DOT Tire Quality Grading (U.S. Vehicles)
The tires on your vehicle meet all U.S. Federal Safety Requirements. All
tires are
also graded for treadwear, traction, and temperature performance according
to Department of Transportation (DOT) ...