Bootjack Cavern is an unmarked location in the Mojave Wasteland that is east of the wrecked Highwayman. From there, head due east (toward Lucky Jim Mine) until reaching the cliff face, then head north along the cliff. The cavern entrance faces west, towards the road. The Pip-Boy display is deceptive because it displays the quest marker on the east-facing side of the mesa, in the cave's interior. Players having difficulty finding the location would be well-advised to begin at the road and head east, rather than beginning at Lucky Jim Mine and heading west.