I have a 2006 ML350 however it does not have the navigation option, my question is there a way i can add this or does it have to be a complete new head unit?

thanks in advance

 

mb has an add on nav for it, needs to be coded for the cluster, and there is an antenna splitter, but it goes above the cd slot.

It is still an antique system though... Look into replacing it, but it will require a rewire. I am working with someone to try and get an interface done for the ml, gl, r, and c radios while retaining the factory amp, but I have no time to really dedicate to it. Nor does the engineer