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Originally Posted by Dr.Sid
Sphere array can 'hear' bearings from lets say -120 to 120 degrees. If you draw solid line at 0 it would be in the active area and it could mask contact at bearing 0.
If you draw solid line at bearing 180 there is no conflict.
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But isn't the priviledged method of detection the towed array ?
In this case its the stern line that would be in the active area of the sonar, so you're better off with the solid line at OS course.
Frankly I find it more intuitive that the solid line be the OS course instead of the 180 line.