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:
Inspection
Raise and support the vehicle.
Remove the front wheels.
Check the thickness (A) of the inner pad (B) and the outer pad (C). Do not
include the thickness of the back ...
Map Screen
...
A/C System Charging (With A/C)
caution
Air conditioning refrigerant or lubricant vapor can irritate your
eyes, nose, or throat.
Be careful when connecting service equipment.
...