Thanks again for the help. This forum was a huge help, it made doing the self install ten times easier.
I have another quick wiring question if you don't mind.
I'm getting the xm nav traffic unit in a couple days. This is probably a dumb question to ask, but is there any reason I can't connect to the power and ground leads that are going to the head unit? I thought it would be easiest if the ip bus, data and power/ground cables are all going to the same location.