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:
Devices that Emit Radio Waves
The following products and systems on your vehicle emit radio waves when in
operation.
Each of the above complies with the appropriate requirements or the required
standards of FCC (Federal Commu ...
High-Mount Brake Light Bulb
High-mount brake light bulb is a LED type. Have an authorized Honda dealer
inspect
and replace the light bulb. ...
Rocker Arm and Shaft Disassembly/Reassembly
NOTE:
Identify each part as it is removed so that each item can be reinstalled
in its original location.
Inspect the rocker arm shaft and the rocker arms.
If reused, the ...