None whatsoever.
if in doubt - PM kieran either on here or on facebook. If you are in the north of England, they can fit too!
As Tell said - you may need a GPS antenna if you don't already have one and most certainly a DAB antenna as well.
The original box has sat nav... I keyed the code into Google where you can read the back plain of units . It was a serial number that had got my interest on something else this afternoon. Think it's just the DAB aerial if that's important.