Here's a pdf I put together on TACAN Navigation, I hope its useful to you all. It just anchors down on what Tex has already explained. Feedback is encouraged.
There are a few things I need to edit in the file as I caught a couple errors haha
Tex, my buddy went through API with me in 2012 in Pensacola. A few Air Force guys went through Navy API with us in Pensacola. Some went C-130s and I think 1 went Vipers.