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FWIW for those trying to do quality forensics from the ship track:

Speed at the arrow at the hard starboard turn = 17.3 knots (my guess at impact)
Speed at the next tick mark = 11.2 knots (holy shiite, what happened?)
Speed at the infamous U-turn 7.6 knots. Slowing all the way to the hard port U-turn.
Speed where the tight maeuvering is going on = 2.9-3.7 knots, what I would gather to be minimum steerage speed (I was not a swabbie, just what I have read)
Speed as the 90 ° starboard turn back toward Yokosuka = 1.0 knots.