Hi and wellcome aboard
Hope you have a great time here
To your question:
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still cannot clearly understand what is meant by bearing line shifting after submarine changes it's course.Does that mean,that ambiguous bearing line should start to flex or curve?
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Yes, more or less. While you see for each contact two vertical lines while your course is steady, as soon as you change course (Well, when the towed array that goes 1000 yards behind you does) the one who is the ambiugous one will start to drift, making a marked curve until becomes steady at a new point (Matching the moment the towed array is steady in its nw course). The true contact will however remain at the same bearing, although also making a less maked curve. What you have to watch is the bearings at which the contacts where before and after your course change. The tru contact will be at the same bearing, while the ambiguous one will have moved to another bearing. Those bearings you can get at the top of the waterfall, placing your cursor over the contact and seeing at the digital display the bearing it means.
And don't forget that if you have already the target aqquired in another sensor, that is enough to tell you which is the true one: It is the one whose bearings match more or less one of the "mirrored" two of the towed array.
Hope that helps.