Thanks guys! I tried a couple quick searches and got nowhere fast, so I just figured I'd post instead. I had only looked at the Navigation manual, which did not mention any "User" menu, IIRC. Just for reference, here's a link to the relevant manual, from the previous thread:
Originally Posted by ppro
It's in the manual.
Here -
PDF file
Page 14
When you go in here and select a user as described - it saves the current station on the radio. So pick the station you want for a default before you come in here...
I'm still not 100% clear on whether this user setting is related to the key used (it seems like it from the posts), or whether I can get rid of this default station completely (so that it just sticks to the last station when you turn the car off), but I'm sure I can answer these questions quickly just playing with the user menu for a few minutes. I'll post up if I figure out any new info. Thanks again.