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:
Spark Plug Inspection
Remove the ignition coils and the spark plugs.
Inspect the electrodes and the ceramic insulator:
Burned or worn electrodes may be caused by these conditions:
...
Dust and Pollen Filter Replacement
Open the glove box. Remove the glove box stop on each side, then
let the glove box hang down.
Pull the dust and pollen filter assembly (A) out from the blower unit.
...
Displaying the Map Menu
Use the Map Menu to control the icons displayed on the screen. You can also
use
the Map Menu to find locations or to cancel the route.
1. On the map screen, select MAP
MENU (if displayed).
...