I'd recommend buying a nav unit separate from your audio receiver. The ones built-in to the receiver don't have to the graphics, portability, and ease of use of the purpose-built standalone GPS units.

Your money would be MUCH better spent on the Garmin Nuvi 765T and a separate receiver:
http://www.amazon.com/Garmin-765T-Wi...2736599&sr=8-1

While the JVC unit and other Nuvi's refresh the screen once every one or two seconds, the 7x5 series updates the screen 10 times per second. It also draws 3D buildings (just like Google Earth), enables real 3D camera movement (turn the camera left and right), is compatible with the newly released Lifetime Map Update (One time fee of $120 = 4 map updates per year for the lifetime of the device VS one update per year for $70), and Garmin's high sensitivity GPS receiver. With the Nuvi 765T, you will also receiver the traffic service for no additional charge. You can also take the Nuvi with you, in any car.

I almost forgot another very cool feature: Lane Assist: