A friend and I have both had this problem. He is on Xbone, and I am on PC. When we reached Step 4 of Wayfinger's Voyage, it says to return to the Helm and speak to Petra. However, we can't select the hologram of Petra. We can only select the Compass right next to it. I tried abandoning the quest to pick it up again. The quest does not reappear in the abandoned quests console. Both of us are stuck.