Thanks
I've found this module that you can hook up to your mk4 nav even if you don't the factory tv.
ToysInYourCar.com - 3 / 5 / X3 / X5 AV Interface (nav but NO TV)
Pricey at £325
I have seen some factory tv module with cable but really expensive too at
Best Sellers BMW (& Range Rover) TV Video Module Kit
+ $25 for video in motion= £377
Anywhere cheaper?
In my mk4 satnav manual it says that the BMW TV module is digital and has the epg?