I need to change my car dvd gps;could you please give me any information about good aftermarket unit where i can get all the facilities in one unit?

 

Look on eBay and Amazon for aftermarket units. There are lots available. Only you know what features you want so nobody's going to tell you which one to buy. Pay attention to the size of the unit and make sure it will fit in your dash, and that a good looking face panel is available if you need it.