If you didn't have the Navigation system installed from the factory, then your best bet is an aftermarket one. A short list of what would be required to get the factory one installed is:
New Multi Function Display (the Nav system's MFD has more buttons).
New wiring harness (with Nav system connections).
DVD player (for under the driver's seat)
Maybe even a new steering wheel.
It would be cheaper to purchase a new Prius.
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