Thanks for the link to the nav system specs. It seems like (but still can't quite confirm) that the dealer has to install some special Sirius package to the tune of $399 (in Wash DC area) and then it might actually display on the unit and function properly. I am not sure I am willing to drop that much just to have a direct connect that displays on the monitor. Plus I am not sure how robust the display is once it is hooked up. PIE makes some adaptors (pie.net) that will allow at least the sound to direct connect using the cd changer input. That might be the way I go. The ford dealer book also said the radio was 'mp3 compatible' but I burned a regular and data mp3 cd and it did not work. Not sure if having an early 06' is the problem or what as the new mariner's say thier nav is mp3 and sat compatible as well. If you find out anything else please let me know and I will do the same!