The Importance of Ultra Reports in the War

Tang didn't have the periscope radar that you could ping like manually in the direction you're training the scope. And this was a course surface ship surface search radar. So it gives you all the information you need to pull ahead of the convoy and get in a firing position. Tang ends up sinking some ships, just a few. But he's submerged, I believe, on this attack. Is he not? The one mistake that the escort did was that they dropped Joe's five depth charges and then left Tang alone - which is probably not a thing to do.