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:
Carbon Monoxide Hazard
Your vehicle’s exhaust contains carbon monoxide gas. Carbon monoxide should not
enter the vehicle in normal driving if you maintain your vehicle properly and follow
the information on this page. ...
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 ...
Handling the Unexpected
This chapter explains how to handle unexpected troubles. ...