Length, width/beam, mast, draft... all makes perfect sense. But the rest of it, not a clue. As you say without knowing the starting points etc it's difficult to say. Based on my old days in MS Paint and HTML image maos, each of the 4 coords should give a corner - as you say it gives a rectangle. Maybe they refer to pixels rather than metres in this instance?
Do you mind if I ask what you're looking to find out in particular? I only ask as it may just reveal another method / approach etc.
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