Now that i think about it.. im not even sure how practical the 2-leg moving method is given the short hydrophone ranges on a u-boat.
It's rather pointless to be listening that long.
If you look at that example in the pdf the target was like 68nm away.. thats like 125km. Much more practical.
Now scale that down to U-boat a hydrophone of like 20km listening distance. You run for 30 minutes listenging at 3kts for a target thats doing 11kts... and he's already travelled almost half the distance (8km), while you've traveled nearly 3km... and thats just the first leg !!!
It seems much more practical to sit stationary and listen for like 20-30 minutes and see what he's doing before you start moving. If he's closing it wont be long before you get contact anyway. You have about enough time to run to a triangulation point to get his true distance and speed then setup for an intercept.
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