Satnav Retrofit

[Adusadi]

Hi everyone. :)

My father bought recently a ford galaxy ghia 2012/13 year...it has factory fitted original ford radio (not sony, not sat navi,).... My question is, if there is any "step by step" guide to replace it with sat nav unit from ford, or if anyone know what need to be changed and what parts (sat nav model, parts numbers) will I need to replace old unit..... its first ford in our family and Im totally newbie in this.... Had audi a4 before and replacing old unit for sat nav (RNS-E) was preety easy operation.....

thanks in advance

Adrian