The Ocean Shield is working its way to the south crossing at a right angle the tracks previously taken. The graphic below updates a previous one, and the latest position is noted in Orange. These are the ship's position and the TPL can be over a 1000 meters astern or even out to one side, depending on the effective "drift" component existing between the TPL and the towing vessel.
Bear in mind that the signal strength received at the TPL can vary considerably due to the effects of deep water sound channel ducting, but will show the least phase distortion and largest signal etc.. normally when the TPL is directly above the ULB.