To find the Dark Lord you must gather numbers from the six other Star Wars characters in this part of the park:- Han Solo, Luke Skywalker, Chewbacca, Yoda, Princess Leia and Obi-Wan Kenobi, in that order.
Lord Vader is at N 48 31. Han, Luke, Chewy W 123 29. Yoda, Leia, Obi-Wan