Or Or.......... get you a sonar.
You need the 2 bearing contact, 2 distance and you check contact from the two bearing contact.
Time watch is not needed to find the AOB but important to find the target speed.
You do trigonometry.
With trigonometry you got the speed target
You have the course of the boat.
Cruise parallel to its course at the same speed.
Now get a new bearing.
(180- new bearing)= AOB.
Note this is purely Theory, when you get in game. The hydrophone, and every device which helps you to make your plot are not accurate. And plus you have to act fast.
Hmmm you ask me how i figure out? Just playing with trigonometry
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