I've tried the blue discs in my nav system and they definitely do not work. Becker does put out updated US CDs for their nav systems in Porsches and Ferraris so if anybody's got a 2007 or 2008 Ferrari lying around, we could try those discs.
I asked the eBay seller for info about the discs and he said:
"There were no released updates for the Crossfire navigation. I worked for the manufacturer and the nav software I have is an internal release on 4/5/07 which contains 3 CD's."
Hmm...