can a navigation system takes you to the exact address? . I mean An exact home address from Islamabad to somewhere in Peshawer in Qissa Khawani Area?.. The navigation systems are good if the geographic data is keep on updating with time. Spending extra money on built in navigation systems in Pakistan is more of a luxury item in the car rather then use I believe " if the mapping data is not in depth and covering the whole map of the country".
As far as system itself.. the cost difference is almost same between the car without nav and with nav. But the navigation system is to the point/ exact and covers the whole country. I can reach a small shop in california or a home in suburbs driving from NY..