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:
Power Mirror Switch Test/Replacement
Remove the instrument panel.
Disconnect the 13P connector from the power mirror switch (A).
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"Honda_SymbolMarkeng";src: ...
Rocker Arm Assembly Removal
Remove the cylinder head cover.
Loosen the rocker arm adjusting screws (A).
Unscrew the rocker shaft mounting bolts two turns at a time in the
sequence shown.
...
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 ...