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:
Connecting Rod and Crankshaft End Play Inspection
Remove the oil pump.
Measure the connecting rod end play with a feeler gauge (A) between the
connecting rod (B) and the crankshaft (C).
Connecting Rod End Play
...
Driver's Seat Position Sensor Replacement
Removal
NOTE: Do not turn the ignition switch to ON (II), and do not connect the
battery cable while removing the driver's seat position sensor.
Do the battery terminal disconnection ...
Troubleshooting
Why does the vehicle position icon on the map “lag” a
short distance behind my actual position, especially at
intersections?
This is normal. The navigation system is unaware of the
width o ...