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:
A/T Housing Idler Gear Shaft Removal and Installation (A/T)
Remove the snap ring (A), the cotter retainer (B), and the cotters (C)
from the idler gear shaft (D), then remove the idler gear shaft. Do not
distort the snap ring.
Check ...
Security System
On Sport model
The security system helps to protect your vehicle and valuables from theft.
The horn sounds and a combination of headlights, position lights, side marker
lights and taillights flash ...
Horn Test/Replacement
'09-11 models
Remove the front grille cover.
Disconnect the 1P connector (A) from the horn (B).
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"Honda_SymbolMark ...