Hidrophone atack

[bojan811]

I saw the video with the some lad.
He actualy hears the boats on his hidro and hunts them without rising his periscop.
I looked a video and tried to repeat his actons , but with no suces.

He was using some 4 berinline mesurments with the (180-A1):2=first angle...sound familliar?

If do please answer here so that I can make my questions.
Only the people who actualy was capable to repat that tutrial in practise with sucses.
I don`t wanna hit them without the use of atack p , just wanna find them in poor visibility and bad weather.

Sorry for the speling and the grama.

Thanks in advance.