I've just written a driver module for our broadcast control system to talk to the gold card. After speaking to someone at Roke about their shite serial protocol I was told the product is no longer available as shown on website (and as a dev kit, which I have). It is now only available as a custom unit for use in other products, and unless you're willing to buy a couple of thousand units they won't return your phone calls. Sorry to crap on the thread, but the gold card is a real non-starter. You might as well buy a DAB headunit, it would probably be much cheaper. Or stick a PC in the boot and run a wavefinder.
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Cheers,
Andy M