[I'm goin' down]

I do not intend to rain on anyone's parade (other than TorpX's), but gutted's Solution Solver program has something quite similar. It has been on the market for a couple of years.

With a periscope view in the Solution Solver, as the ship is rotated the Aob view along with the readings change accordingly. This is a stand alone program. Using the EASY Aob mod, you can obtain the target's course, plug it into the Solution Solver, calculate the Aob, calculate how many degrees you must turn your boat to be on a 90 degree intercept bearing (if that is what you want), and calculate the lead angle for fast or slow torpedoes. It is the whole kit and kaboodle.

Note, you must calculate the target's speed and can do so using the program options or by regular methods. And the program will provide you the lead angle at any Aob, and will calculate the firing point for fore and aft tubes.