I also can't install it on my German Car

I also purchased the GTM 10 for use with my nuvi and I have a German car (Audi). The installer tried to use an adapter but finally had to give up as he said that none of the adapters worked. Guess I'm stuck, but reading some of the other reviews, it appears that the real time traffic interface doesn't work that well anyway. I love the nuvi though.

Bad description on Amazon

I don't know how this device works, because I can't install it in my German car. Amazon fails to say you need a special connector for European cars, which costs $50. Amazon also fails to say you will need to spend $60 a year, after the first 15 months, to subscribe to a traffic radio service that will make this device work. If you travel a lot, you may need to spend $60 many times over to get the radio signals in different cities. Misleading advertising!

As accurate as tomorrow's weather

While the rerouting feature usually works fairly well, the accuracy of where there is traffic is horrible. I have come across accidents that weren't on the system and driven through red and yellow zones where there was no slowing. This product is a good start at a great idea, but the up-to-the-minute traffic info is still a ways off, aparently.