In my experience the reliability to calculate the distance with the sonar line in the maps is at those distances +- 5km minimum. Only when the target is less then 5km from u its pretty accurate otherwise use it only to plot its projected course.
In those days a visual based attack was standard. Sonar was mainly used to detect and track hostiles from the distance beyond the visual range. I submerge every hr and check if there is anything in range the deckwatch cant see.
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