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:
Clutch Wave-Plate Phase Difference Inspection (A/T)
Place the clutch wave-plate (A) on a surface plate, and set a dial
indicator (B) on the wave-plate.
Find the bottom (C) of a phase difference of the wave-plate, zero the
di ...
Start-up
The navigation system starts automatically when you turn the ignition to
ACCESSORY (I) or ON (II). At start-up, the following Confirmation screen is
displayed.
1. Select Change Language.
► ...
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).
...