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:
Powertrain
...
Instrument Panel Indicators
The instrument panel has many indicators that give you important information
about your vehicle.
Malfunction Indicator Lamp
Low Oil Pressure Indicator
The engine can be severely damaged if th ...
Accessories and Modifications
Modifying your vehicle, or installing some non-Honda accessories, can make it
unsafe. Before you make any modifications or add any accessories, be sure to read
the following information.
Accessor ...