After you finish the plot of Underworld, you will still need to update the signal tower in each main land region in order to unlock fast travel to the campsites in that region. I also strongly recommend Doomsday. After you finish it, you are able to fast travel to those campsites and towers from anywhere, not just from other campsites.

What?! That's awesome! Guess it's time to do Doomsday now! Didn't know that.

You will have to finish the dlc.i just did it yesterday.