The line is a bearing from your boat to the targeted ship. If you were stopped and the ship was circilng you, that line would follow them like the hand of a clock. The longer the line, the farther away they are. I think that the better your sonar guy is, the more accurately the line is drawn.
I have no idea what close, medium, and long ranges are.
There are plenty of sources out there to help you use the hydrophones. In a nutshell, you have to mark the enemy position based on the line (puut a marker at the end of the line). Then a little while later mark it again, and again until you get a track of dots which should give you an idea of the targets course. Then you can run a line along it to find the general path of the ship, do a high speed run around to get in front, then wait for your prey. If you are trying to manually target ships, you have to do a lot more and would benefit from the many tutorials and tool mods floating around.
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