Hello Smeeg and the rest.
The US units I sell are never been used. They have never been installed in a car before. So they are coded for Audi A4 without any extra options.
Your navi will always work, but as AudiA4B6US said, it could give some strange ODB errors. Because your configuration is pretty flat, you don't have to worry about coding the unit.
The only thing you should code is the Driver Information System (I already told you over MSN).
For the other readers:
- Start VAG COM or other OBD software
- Goto to Sub 17 (or Dashboard. In german they call it Schalttafeleinsatz)
- Increase the value of channel 62 with 4.. In case you have 17, make it 21. In case you have the value 1, change it into 5