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:
Online Reference Owner's Manual
This owner’s manual should be considered a permanent part of the
vehicle and should remain with the vehicle when it is sold.
This owner’s manual covers all models of your vehicle. You may find ...
Customer Service Information
Honda dealership personnel are trained professionals. They should be able to
answer all your questions.
If you encounter a problem that your dealership does not solve to your satisfaction,
please ...
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.
...