Hunting by sound
I submerge about every hour for a check around. I go to P depth usually, but lower if the weather is bad. Then I stop engines and man the hydrophone myself.
Not having the engine running gives you a chance to listen behind the boat.
If I get a contact, I turn towards it and carry on. A strong contact would mean a periscope check. After 10-15 minutes I stop and listen again. This tells me if the target has moved left, right, or not at all. His general direction is then known.
Now I surface and head in the possible direction for contact at full speed. If nothing is seen in 15-20 minutes, I dive and start again.
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