Yup, manual TMA is a bit of a pain in the ass. I tried it awhile back as detailed in this thread and through examples with Mobo, it ultimately just wasn't worth the time and effort. The concept, however, is really cool - being able to ascertain a target's range, course, and speed through the use of passive sonar. Of course it all goes out the window if the target alters his speed and course :haha: I just leave the TMA stuff for the boats in Dangerous Waters and stick to my whiz wheels and Mobo for intercepting known contacts either reported by radio or spotted by my lookout crew.

I too think the results (target course and speed) in the pdf are a bit wrong in that chart. I get a target speed and course when drawing by hand (177-ish) that is much closer to 180 degrees like your tool. My drawing shows a speed of 10.5 kts. But the method itself works.