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:
Tire Pressure Monitoring System (TPMS)
U.S. models only
Your vehicle is equipped with a tire pressure monitoring system (TPMS) that
turns on every time you start the engine and monitors the pressure in your tires
while driving.
Each ...
Disassembly
Raise and support the vehicle.
Remove the rear wheels.
Release the parking brake, and
remove the brake drum.
Remove the tension pins (A) by pushing respe ...
Obtaining Navigation Update Data
Honda is continually expanding the scope
of the navigation system. Navigation
system software upgrades may be made
available periodically, usually in the fall of
each year.
To purchase an updat ...