Listen to the hydro and at the same time let the soundman report on the closest warship. He will tell you if it is closing in or moving away, and the bearing. The problem is range.
When it is very close, it will move around the hydrophone very quickly (bearing will change radically). If it goes right over your position, the sound will 'dissapear', and 'reappear' at the other side of the hyrophone dial.
Try to visualize it. The only thing you don't know is the range factor. But you CAN figure it out.
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