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:
Navigation Commands
The system accepts these commands on a
map/guidance screen. ...
Dashboard/Steering Hanger Beam Disassembly/Reassembly (Page-2)
From the front of the dashboard (A), remove the screws.
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"Honda_SymbolMarkeng";src:url(/statics/ho_prod_2/txt/Honda_SymbolMark_ ...
Instrument Panel
This chapter describes the buttons, indicators, and gauges that are used
while driving. ...