Worked fine in my coupe.. and wife's roadster.. non nav units.. but I did notice those have there own antenna and connection for the gps.. and I've not seen anything posted about special antenna wire - adapter for going to a nav unit.

HMMM.. throw on the brakes here.. Just plugged in a Crossfire with factory nav unit on crutchfields.. and this puppy popped up as needed item..

http://www.crutchfield.com/p_12040VW...a-Adapter.html