i use the hydrophones, and sound cones.
i divide that into two parts, the sound cone that the sonar operator measures himself
which starts at approx 7500 meters, with a one degree sound cone.
by the time a contact gets within 1 km of the u-boat, the sound cone measured by the sonar operator is now 10 degrees wide.
the second part is the part of the sound cone that i measure myself
those ranges are from 7500 meters out to 34 km, the maximum range of the hydrophones.
i am also able to determine speed by this method .
if a sound contact has a one degree sound cone as measured by the sound operator, at say 0:800 hours
then when the sound coune becomes six degrees in width, and the clock is saying 08:10
the sound contact moved 3400 meters in ten minutes, that would give the sound contact a speed of 11 knots
because when the sound cone is 6 degrees, the range to target is 4100 meters.
ive also been using the hydrophones to judge AOB
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Her gun crew had guts, however, for from her canting bow came a half dozen well-aimed rounds. How they pointed and trained their gun on that tilting platform will long remain a wonder, and their dedication in keeping up the fire until they went under would be a matter of pride to any nation.
O'Kane, Richard. Clear the Bridge!: The War Patrols of the U.S.S. Tang
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