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:
Map Display Commands
Display current location (shows current
latitude, longitude, and elevation)
Display/Hide (specify icon type):
ATM
gas station
restaurant
post office
grocery store
lodging (hotel, motel)
parki ...
Troubleshooting
Why does the vehicle position icon on the map “lag” a
short distance behind my actual position, especially at
intersections?
This is normal. The navigation system is unaware of the
width o ...
Off-road Tracking
INFO button
► Setup ►Other
►Vehicle
The navigation system can be set to display white off-road tracking dots
(“breadcrumbs”) on the map screen whenever you drive into an are ...