Satnav

I hope someone can help ? I'm now a proud owner of a 58 plate superb one owner 30000 on clock full service history, now the bad news it says Bluetooth great i thought but to no avail would it connect then I let my son try no luck so he looked up and low and behold nobody can if they have iPhone, Anyway what he did was go back to factory settings bang no Satnav as such try to set new destination and I've got to put uk in then city town carn't get post codes it's not a one-off its every time uk city oh i forgot to start it always goes to Europe what can i do regardes oldtimer