Can you retrofit sat nav to the bolero unit or would you need to change the unit altogether.

There are some addons out there, with the best being from Kenwood and Pioneer, but they do cost a fair bit.

 

The Kenwood unit was on sale some time ago, but that is gone.

 

Also, there might be some Chinese stuff.

 

It simply plugs in at the back of the whole thing and can be controlled from the Bolero screen.

 

But are we talking MIB1 or MIB2? If MIB2,  Android Auto might be your best bet, since it soon will support Waze

Kenwood sell this through Skoda dealers for £499 fitted.

 

Sometimes they come up on sale though, I got mine for £120, takes an hour or so to fit, easy diy.

 

http://www.kenwood-electronics.co.uk/car/oem/skoda/GVN-MIB1/