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In The Last Jedi some key new technology is assumed to be the reason why:

The First Order can now track ships through hyperspace without the use of a tracking beacon.

Not long after this, several characters come up with a plan for how to disable this tech. As part of their discussion holographic schematics showing both the appearance and location of this tech are shown.

If this tech was new how did the Resistance have access to the schematics showing both what it looked like and where it was physically located?

  • The tech they showed was the "active tracker" not the hyperspace tracking algorithm or whatever you want to call it. – Edlothiad Dec 21 '17 at 10:26
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    They assumed it was based on the same tech and possibly even the same tech. For all they knew it was different but it was the best plan they had – TheLethalCarrot Dec 21 '17 at 10:34
  • @Edlothiad And? The point is they identified something that they needed to destroy on the FO ship, yet already had access to detailed schematics showing both where it was and what it looked like. My question was asking how they got hold of those schematics in the first place and how they determined which "thing" out of the millions of components in that ship was the thing that they needed to destroy. – Steven Rands Dec 21 '17 at 10:34
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    I think Finn says something along the lines of he used to mop the floor of that room. Even if they didn't have schematics he'd know where to look and they could have just plugged the coords into a computer to create the fancy projection. The tech in the image is also probably old so I think they would have had schematics for that. – TheLethalCarrot Dec 21 '17 at 10:46
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    You’re not understanding what I’m saying. The thing they highlight is an active tracker, which R&F suggest is a currently existing technology. The way they do hyperspace tracking is an extension of the existing technology that they highlight. God knows how they got the schematics to the supremacy, but once they had, Finn knew what he was looking for, because he’d seen it before. – Edlothiad Dec 21 '17 at 11:05
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I believe that the schematics of the tracker they show was of an old tracker, the normal type, not the active tracker (light speed one). However, Finn and Rose have a conversation that it must be based on the same technology and so are assuming it is the same tracker though it might not be.

When coming up with the plan a conversation similar to the following takes place (from memory):

Finn: I used to mop that floor
Rose: If you get use there I can disable it

So even if they didn't have the schematics Finn knew where the tracker was so the could have just plugged some coordinates into a computer to get the graphic they showed.

  • They call it an Active Tracker – Edlothiad Dec 21 '17 at 11:07
  • I don't understand why Rose needed to be there to blow the thing to bits - or were they going to do a nice graceful shutdown of it, leaving it completely intact with the warranty in place? – Moo Jan 9 '18 at 8:32
  • @Moo This is explained in the film, if they blew it up or completely disabled it the First Order would notice and just use the device on a different ship. By temporarily disabling it the FO wouldn't notice and it should give them enough time to escape. – TheLethalCarrot Jan 9 '18 at 9:01
  • @TheLethalCarrot what's to stop the FO from tracking them again using the same technology though? The tracker clearly has a huge range. – alexgbelov Jan 10 '18 at 1:59
  • @alexgbelov To track you have to find and track that's why it's called a tracker not a scanner. – TheLethalCarrot Jan 10 '18 at 9:06

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