Using sonar to find targets is slow, has too low a range and sets you up for the range problem. It also keeps you from finding targets because you have to take all that time to submerge, listen, locate targets and if you use Pisces' method, triangulating them.
Much better to join the twentieth century and realize that your boat is far superior to the U-Boat you are imitating. You have radar. Stay on the surface at cruising speeds, set radar for max distance and cover 100 times more water than the sonar technique. Radar has much better resolution than sonar, will even show your the exact disposition of ships in a convoy and is the gold standard for finding range. What's not to like?
Don't misuse your tools. Just because sonar conceivably can be used to find targets doesn't mean it should be used that way. It's a slam dunk. The number of targets you find is proportional to the number of square miles of ocean surface you can search. Underwater sonar search is so slow, it isn't even worth consideration as a search technique.
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