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First you have to locate the navigation DVD player itself. The navigation system DVD players are either under the front seats or behind the navigation screen. All you have to do to update the GPS system is remove the old GPS disc and insert the new GPS disc. The NAV system will update itself. About the only thing you may have to do is reset the region the Navigation system shows. Most of the time you dont have to do anything. It will do all the updates itself.
Add on Car Navigation System. Add on car gps navigation systems allow you to add navigation to a factory screen or an existing monitor. Add on car gps navigation system provides all the benefit of a factory installed car navigation system but at a far cheaper price. These units offer full car gps navigation with a hide away control box.