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Not, necessarily, so...
As all records show. the USS Fitzgerald had its AIS transmitter turned OFF --- from the time it entered Sagami-wan until the collision.
However, The Fitz's AIS was ON, and faithfully recording all pertinent Fitz data the entire time.
Those recordings, as I understand it, are the source of the Fitz plot shown in the Navy report.
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What is not clear is whether the Fitz crew was monitoring the AIS transmissions of other ships in that crowded set of shipping lanes it was cutting across.
What is clear is that some of the ship-handling decisions by the Fitz' OOD were so wrong, I actually wonder if she was even licensed to drive an automobile on public roadways!
Any sane auto driver -- facing an oncoming, crossing semi (at the same relative speeds and angles) would have reflexively made exactly the opposite steering and speed decisions -- or they would have died...
Forget the "Rules of the Road" (which she violated -- big time). She violated the basic rules of survival!
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BTW, you should know that rlmorel (ex-Navy) and I (cartographer & failure analyst) spent literally weeks analyzing the vessel movements and collision.
In particular, I analyzed the physical damage to both vessels to determine the physics of impact. (FYI, the Navy's scaled vector images of the plan view of the collision matched our [much earlier] reconstruction drawings almost perfectly.)
As a courtesy, I'll share with you a recent observation detail I'm sending rlmorel. It should give you an inkling of the depth of our analyses...
TXnMA
