1) I don't have navi but my car doesn't do that. It will show it when the car starts and then connect to the iPod and then just go to the artist, title and then back to whichever setting it's at...in my case title of the song, but it doesn't go back to that XM 001 screen so you may want to ask Tony regarding that.
2) It stays charging it for a set amount of time after you turn off the car. It will turn off eventually but it stays in there charging for a bit after you turn off the car. You can't undo it that I know of since it's supposed to keep charging it when you turn off the car incase the battery isn't fully charged. The computer works the same way when you connect the iPod to sync it with iTunes since it will keep charging it regardless if it is or isn't charged. I don't imagine it is the biggest issue to the iPod as ppl make it out to be but it isn't officially good for the battery to continue charging after it's fully charged.
2) It stays charging it for a set amount of time after you turn off the car. It will turn off eventually but it stays in there charging for a bit after you turn off the car. You can't undo it that I know of since it's supposed to keep charging it when you turn off the car incase the battery isn't fully charged. The computer works the same way when you connect the iPod to sync it with iTunes since it will keep charging it regardless if it is or isn't charged. I don't imagine it is the biggest issue to the iPod as ppl make it out to be but it isn't officially good for the battery to continue charging after it's fully charged.